Scientific Program

Keynote Talks

Abstract

Persistent phosphor materials at the transparent windows of bio-tissues are expected for in vivo imaging without excitation source, which produces various noises such as auto-fluorescence. The ZnGa2O4:Cr3+ spinel phosphor[1] is a successful example of persistent luminescence at 700nm, corresponding to the 1st bio-imaging window. Because of lower scattering loss and recently advanced availability of InGaAs photo-detectors, near-infrared (NIR) fluorescence probes have been widely developed with luminescence of Nd3+:1.06-m and Er3+:1.55-m, where conventional photoluminescence (PL) is working. In contrast to Cr3+, Mn2+, Ce3+, Pr3+, and Eu2+ ions, the photo-ionization mechanism by UV illumination for the electron charging seems unfeasible in the Nd3+ and Er3+ ions, which take very stable trivalent state. We have developed garnet-based persistent phosphors in which Nd3+[2] or Er3+[3] ions show very efficient and long NIR persistent luminescence. Photon emission rate and duration of these materials are only slightly lower and shorter than the visible persistent phosphors of Ce3+-doped garnets we developed in 2014[4], the performance of which is almost comparable to the SrAl2O4: Eu2+, Dy3+ phosphor. These phosphors can be applied to in vivo imaging in the 2nd and 3rd bio-imaging windows of high transparency and sensitivity of InGaAs detectors.

Biography

Setsuhisa Tanabe received his PhD from Kyoto University, Japan. He is now a full Professor of Kyoto University. He has published more than 200 papers in reputed journals, 25 book chapters and 37 review papers on rare-earth doped luminescent materials for up conversion, fiber amplifier for optical telecommunication and LED phosphors. He has served as a plenary, keynote or invited speaker at more than 100 international conferences. He was the chair of Technical Committee of Optoelectronic Glasses (TC20) of International Commission on Glass (ICG) and now a member of Steering Committee of ICG since 2013. He has been serving as a vice Editor of Journal of Luminescence since 2015.

Speaker
Setsuhisa Tanabe / Professor, Kyoto University, Japan

Abstract

Transparent yttria-stabilized zirconia (YSZ) ceramic samples have been manufactured by the spark plasma sintering (SPS) at various conditions. The optical and corresponding mechanical properties of the sintered samples were studied. A parameter for optimizing SPS processing has been suggested which characterizes optical transparency versus sample thickness. The dynamic evolution of the swelling areas over time after local indentation of transparent YSZ ceramics was shown. The appearance of spalls from the swelling areas depends on the degree of internal mechanical stresses in the given region of the sample and is explained by the relaxation of stresses accumulated on deformation during static indentation [1]. Translucent YSZ ceramic samples have been manufactured by the dry powder uniaxial pressing at powerful ultrasound assistance (PUA) and following free sintering. The effect of the powder compaction pressure and sintering temperature on the density and microstructure of the sintered ceramics was investigated. Translucent ceramic samples having density up to 98% were obtained by the method of static uniaxial pressing at powerful ultrasound assistance (PUA) and with subsequent sintering. The effect of PUA on the elastoplastic and optical properties of sintered translucent YSZ ceramic samples was investigated.

Biography

Professor Oleg Khasanov is head of Department Nanomaterials and Nanotechnologies and director of Nano-Centre of National Research Tomsk Polytechnic University, Russia. He is Dr.Sc. (Engineering, Materials Science of Ceramics) since 2004 and Ph.D. (Physical-mathematical Sciences) since 1986. His researches include study and development of methods of uniform packing of nanoscaled and micrometric dry powders into required shapes with a control of friction forces. The developed methods have been applied for manufacturing a lot of parts from oxide and non-oxide functional nanostructured ceramics and composites including transparent ceramics. Several developed technologies have been transferred in the industry. Oleg Khasanov team deals with RD on luminescent transparent ceramics. He was visiting Professor at University of Ulsan (Republic of Korea, 1998), University Joseph Fourier (Grenoble, France, 2014), Chongqing University of Arts and Science (China, 2016). He has published more than 150 papers in international journals and proceedings; his inventions were patented in Russia, USA, Germany, France, Italy (Europatent), Republic of Korea, India, etc. He delivered invited talks at many regular international conferences/congress on ceramics (ECerS, ICC, SPS Forum, JSPMIC).

Speaker
Oleg Khasanov / Professor, National Research Tomsk Polytechnic University, Russia.

Sessions:

Scientific Sessions

Abstract

We have developed soft X-ray scanning photoelectron microscopy (SPEM) to investigate local electronic structures in nano-materials/devices with 70 nm spatial resolution. We also connected the SPEM sample holder to a semiconductor parameter analyzer. Among several FETs, the first example is a graphene FET where we discovered the linear band dispersion in graphene FET by operando SPEM analysis, indicating the direct observation of p-type doping feature under back gate biasing. The second FET is a MoS2 nanolayer FET which did not exhibit as good performance as exected. We have performed pin-point analysis to investigate the local electronic structure at interfaces in a MoS2 FET, and observed a charge-transfer region (CTR) at the MoS2/metal-electrode interface. The third FET is an organic semiconductor FET (OFET) for light weight, flexible electronics with low cost. In this study, OFETs for operando nano-spectroscopy were fabricated using ultrathin single-crystalline C10-DNBDT-NW films on SiO2 /Si substrates. Operando measurements of line profiles of C 1s kinetic energy across the OFET channel suggest that drain current proportional to hole concentration in the channel generated by the back gate biasing is well correlated by the simple Boltzmann distribution. Finally, the forth FET is a 4H-SiC trench MOSFET. We conducted pin-point analysis of RIE (reactive ion etching)-processed trench sidewall, because chemical and electronic structures of the sidewall which is the MOS channel plane directly affect the FET performance. SPEM analysis revealed local chemical structure and band bending features caused by RIE damages. Future prospects of synchrotron radiation nano-spectroscopy will be discussed.

Biography

Masaharu Oshima is now with Institute for Solid State Physics, University of Tokyo. He graduated from Dpt. of Industrial Chemistry, University of Tokyo in 1972, and received his Doctor of Engineering degree in 1984. He has been engaged in synchrotron radiation research for semiconductors, and nanotechnology for more than 35 years. He became a professor at Dpt. of Applied Chemistry, University of Tokyo in 1995. He was the Presidents of the Japanese Society for Synchrotron Radiation Research, and the Surface Science Society of Japan. He received ECS Best Paper Award and Ministry of Education, Science and Technology Award etc.

Speaker
Masaharu Oshima / Professor,Institute for Solid State Physics, University of Tokyo, Japan.

Abstract

The existence of two liquid phases is proposed in 1992 to explain the first-order transition ofsupercooled water and the presence of two amorphous states under pressure. The discovery in 1996 of the “glacial phase” in triphenylphosphite below a first-order transition confirms the existence of two glass transitions Tg1 and Tg2attributed toliquid 1 andliquid 2. Such transitions also exist, up to now, in water-glycerol mixture, N-butanol and D-mannitol. The absence of quantitative model slows down new findings.The classical nucleation equation is completed in 2007 introducing enthalpy savingsH1 and H2and predicting the formation of supercluster phasesbelow their homogeneous nucleation temperatures T1 and T2 in the liquids1 and 2. The maximum supercooling rate of pure liquid elementsis used to determine H and theirLindemann constant at the melting temperature Tm.Asolidglass phase (Phase 3)is formedin glass-forming melts below the thermodynamic transition T2=Tgwith a new enthalpy saving equal to H1-H2. Three ordered liquidsseem to exist above Tm up toan overheating temperaturewhere they are transformed intrue liquid states. Liquid-to-liquid and glass-to-glass transformations are observed. The most important and intriguing phenomena are the transformation of Phase 3 intoultrastableglass oreven into vitreous glacial phase having a density close to that of crystallized phase. The transformation conditions of Phase 3in these new vitreous phases at various temperatures will be described through several examples. The exothermic latent heats accompanying these transformations are also predicted

Biography

Robert F. Tournier is born in 1934. He is Emeritus Research Director at CNRS Grenoble since 2000. His work is devoted to magnetism of transition atoms, Kondo effect, solidification in high magnetic fields, levitation, growth nucleation, supercooling and glasses. He is rewarded by distinctions: Prix Ancel 1970 (French Society of Physics); Grand Prix Jaffe 1985 (Sciences Academy); Lifetime achievements 2012 (Magneto-science Society of Japan).All his recent papers are devoted to glasses considering that they result from phase nucleation obeying to thermodynamic transformations.He has completed the classical nucleation equation to adapt it to the existence of two liquid states.

Speaker
Robert F. Tournier / Emeritus Research Director,CNRS, Univ. Grenoble Alpes,France.

Abstract

The situation and tendencies of organic (nano-)photovoltaics will be reviewed, starting from the underlying physics up to the current achievements and perspectives of commercialization. The noticeable advances in the efficiency and price of the organic PV cells took place in a few recent years. Now these parameters are already suitable to start the commercial production. However, the first commercialization attempts failed several years ago. The poor marketing and business strategy were claimed to be the reason. Nowadays several institutes and companies are competing in the field, exploring possibilities of different physical approaches and device engineering solutions. The prototype structures and devices were announced recently. Nevertheless, it is clear that their commercial success will depend not only on the suggested solutions and on price, but also on their popularity among end-users, and the commercial management, which is not directly associated with the physical issues and economic indicators. Microscopic charge transport properties are of primary importance in organic material and device engineering, as they determine macroscopic material parameters, thus conditioning device efficiency. Due to the hoping nature carrier mobility is one of the main factors limiting charge transport in disordered organic materials. Thus, understanding of the fundamental transport properties is an absolute must for the purposeful device engineering. We will demonstrate that in materials and structures that are promising for organic and hybrid photovoltaics (MDMO-PPV, P3HT, P3HT with CdSe nanocrystals, DCV6T-ZnPC, also in inorganic α-Si with Au nanoparticles and others) carrier transport phenomena are influenced in a complex way by the light-, electric field- and thermally- stimulated mobility and trapping effects, depending on the excitation conditions. Carrier mobility measurements were performed by the CELIV (Charge Extraction by Linearly Increasing Voltage) method, carrier traps were analyzed by the Thermally Stimulated Current spectroscopy, and Current-Voltage characterization was used to investigate carrier injection and contact properties. We will show that such complex experimental analysis by complementary methods enables discrimination and evaluation of numerical parameters of the mobility and trapping phenomena at different excitation conditions. Moreover, to correctly address transport and trapping issues, distribution of the density of transport states has to be taken into account.

Biography

Prof. Dr. Habil. Vaidotas Kazukauskas holds a full professorship at the Semiconductor Physics Department of Vilnius University, Lithuania, since 2001. He has all in all more than 350scientific publications. Many of them were published in the renowned world-leading journals. He had delivered more than 55 invited lectures at the international conferences. The original investigation method of the transport and recombination phenomena in semiconductors is patented as an invention. He had authored three textbooks. Prof. V. Kazukauskas is awarded bynumerous awards and had conducted many international scientific projects.

Speaker
Vaidotas KAˇUKAUSKAS / Professor Vilnius University Lithuania.

Abstract

Luminescent semiconductor nanocrystals (NCs) have gained increasing attention in the past decade due to their unique optical, electronic and magnetic properties that are not available in either isolated molecules or bulk solids. Then NCs are potential candidates for various technical applications such as light-emitting diodes and lasers and biological fields. In this paper we consider an easy way of obtaining a doped CdTe NCs at room temperature. CdTe nanocrystals were synthesized in aqueous medium by the method colloidal synthesis in a semi-periodic reactor. For stabilization of CdTe NCs surface during the synthesis tioglycol acid S(CH2CO2H)2 (99 %) has been used. To optimize CdTe NC formation parameters, we measured the photoluminescence spectra of colloidal solutions of CdTe NCs and determined the particle size by calculational techniques and experimentally, using photon correlation spectroscopy. The alloying of CdTe NCs by ions of the f-group is an interesting and promising task, in particular because their intraatomic transitions lie in the visible and near infrared regions of the spectrum. For example, the maximum of the luminescence of the erbium is observed at a wavelength of 1550 nm, which corresponds to the second window of transparency in fiber optic transmission systems. However, these transitions are prohibited by the rules of selection and the intensity of these lines is very small. Therefore, the implantation of an ion into a nanocrystal characterized by strong absorbing power, and provided by an effective energy transfer occurs, will significantly increase the required luminescence. From the side of synthesis, the introduction of several impurity atoms in a NC containing only a few hundred atoms can lead to their expulsion to the surface or deteriorate the crystalline structure. Actually this is the creation of highly doped NCs in conditions of strong confinement. Electronic and optical properties in such conditions are not completely studied yet.

Biography

Dmytro Korbutyak received his PhD in the year 1976. He is now a full Professor of V.Lashkaryov Institute of Semiconductor Physics National Academy of Sciences of Ukraine Head of semiconductor nanophotonics department. He has served as a plenary, keynote or invited speaker at most of the reputed international conferences. He has two monographs published (1987, 2000). Laureate of the State Prize of Ukraine in the field of science and technology (1997) Prize of the Academies of Sciences of Ukraine, Belarus and Moldova (2013). He was awarded the title of the professor in 1992. He has published more than 200 articles in well-known scientific journals. Now he is continuing to work as a member of the editorial board of two authoritative journals.

Speaker
Dmytro Korbutyak / Professor, National Academy of Sciences, Ukraine.

Abstract

The work is a review of low-temperature RF plasma treatment (RFPT) of shallow layers of n- and p-type Ge and Si disordered by ion implantation of different kinds of ions (B+, P+, As+, BF2+) and proposing of models elucidating of strong ordering of defect and amorphous thin layers. The RFPT (13.6 MHz) was performed in forming gas, N2 and H2 gases with additional heating (up to 250°C). Thermal annealing (TA) and RTA of the implanted samples in nitrogen atmosphere were performed for comparison. Amorphous phase ordering (in case of Si) and recrystallization (in case of Ge) of the thin subsurface layers and activation of implanted dopant were analyzed by Raman scattering spectroscopy (RSS); surface morphology – by AFM; distributions of implanted and activated dopant - by SIMS and ECV; electrical properties of the thin layer - by CV and four probes methods and thermally activated current spectroscopy. The RSS shown that amorphous phase in the thin Ge layer was recrystallized by TA at considerably higher temperature than in case of RFPT, while in case of thin Si layer a strong ordering of amorphous phase was observed. Direct experiments with RFPT of front and back sides of the samples demonstrated manifestation of nonthermal processes enhanced of RF plasma treatment. The nature of enhanced defect layer ordering, recrystallization of the amorphous implanted Ge layers and implanted dopant activation is discussed.

Biography

Prof. Alexei Nazarov has completed his habilitation on DrSci in Physics and Mathematics from Institute of Semiconductor Physics NASU, Kyiv, Ukraine. He is the head of department of Functional Materials and Nanostructure and professor of Physical and Mathematical Faculty of National Technical University "Igor Sikorsky KPI". He has published more than 250 papers in reputed journals and has been serving as special editor and author of 11 books and journals.

Speaker
Alexei Nikolaevich Nazarov / Professor, University of Ukraine, Ukraine.

Abstract

Topological insulators (TIs) have a bulk energy gap that separates the highest occupied band from the lowest unoccupied band while gapless energy electronic states that are protected by time reversal symmetry live at the edge (2D TIs) or surface (3D TIs).Typical topological insulators are narrow gap semiconductors with an inverted band gap and their properties can be analyzed through the non-local transport, magnetic field response and THz spectroscopy. On the other hand, a topological insulator in the proximity to an s-wave superconductor is the prefect material to detect signatures of Majorana fermions.S-wave superconductor on the top of the surface states of 3D TI generates s-wave and p-wave pairing mixture in the surface state due to the spin-momentum locking. We predict that in the Josephson junction setup, namely superconductor (S) /surface state of topological insulator/superconductor (S), existence of this p-wave component leads to novel features in transport like superconducting Klein tunneling i.e. the perfect transmission of propagating Majorana states for normal incidence, the non-sinusoidal current phase relation [3] and unusual phase-dependent thermal conductance. Further, we propose the experimental setups to observe signatures of Majorana fermions in the ac Josephson effect on TI hybrid structures

Biography

Speaker
/ Physics Department, Wurzburg University, Germany

Abstract

Optical second harmonic generation (SHG) is a valuable tool for exciton spectroscopy of semiconductors especially in combination with strong magnetic fields up to 10 Tesla and electric fields. Our previous studies performed on diamagnetic GaAs, CdTe and ZnO [1,3], diluted magnetic (Cd,Mn)Te [2] and magnetic EuTe and EuSe [4] semiconductors disclosed new mechanisms for SHG. They have been performed with spectrally narrow laser pulses (width of 1 meV, 8 ns pulse duration, 10 Hz repetition rate) which have been tuned through the spectral range around a half of photon energy of the exciton resonances. Here we present a new method of high resolution harmonic spectroscopy by use of broad band femtosecond laser pulses with width of 20 meV on narrow exciton resonances down to 0.05 meV. Using of high repetition systems up to 30 kHz and 80 MHz with high peak power of 200 fs laser pulses significantly increases the system sensitivity and reduces the accumulation time by orders of magnitude. We present examples of three systems. First, Cu2O with inversion symmetry wherein SHG is forbidden in electric-dipole approximation. Nevertheless one can detect resonances of even as well as odd parity exciton states. Detailed polarization diagrams for linearly as well as circularly polarized light are derived and show good agreement with the theoretical calculations. Second, ZnSe without a center of inversion. We discuss the implications of exciton-polariton effects, which result in a spectral shift of SHG resonances in respect to the ones measured by one-photon reflection. Third, ZnSe/BeTe and ZnO/(Zn,Mg)O multiple quantum well structures with two-dimensional excitons. Major effects which influence the exciton states in these materials are quantum confinement and the quantum confined stark effect.

Biography

Optical second harmonic generation (SHG) is a valuable tool for exciton spectroscopy of semiconductors especially in combination with strong magnetic fields up to 10 Tesla and electric fields. Our previous studies performed on diamagnetic GaAs, CdTe and ZnO [1,3], diluted magnetic (Cd,Mn)Te [2] and magnetic EuTe and EuSe [4] semiconductors disclosed new mechanisms for SHG. They have been performed with spectrally narrow laser pulses (width of 1 meV, 8 ns pulse duration, 10 Hz repetition rate) which have been tuned through the spectral range around a half of photon energy of the exciton resonances. Here we present a new method of high resolution harmonic spectroscopy by use of broad band femtosecond laser pulses with width of 20 meV on narrow exciton resonances down to 0.05 meV. Using of high repetition systems up to 30 kHz and 80 MHz with high peak power of 200 fs laser pulses significantly increases the system sensitivity and reduces the accumulation time by orders of magnitude. We present examples of three systems. First, Cu2O with inversion symmetry wherein SHG is forbidden in electric-dipole approximation. Nevertheless one can detect resonances of even as well as odd parity exciton states. Detailed polarization diagrams for linearly as well as circularly polarized light are derived and show good agreement with the theoretical calculations. Second, ZnSe without a center of inversion. We discuss the implications of exciton-polariton effects, which result in a spectral shift of SHG resonances in respect to the ones measured by one-photon reflection. Third, ZnSe/BeTe and ZnO/(Zn,Mg)O multiple quantum well structures with two-dimensional excitons. Major effects which influence the exciton states in these materials are quantum confinement and the quantum confined stark effect.

Speaker
Johannes Mund / Researcher, TU Dortmund University, Germany.

Abstract

The error of positioning in the angular direction caused by the limited accuracy of the angular encoder is rather specific and typical only for laser pattern generators containing a rotation unit. The error of this encoder is particularly important for formation of topology of angle measuring structures, such as angular rasters, limbs, scales, or multibit code disks, and for synthesis of topology of arbitrarily shaped diffractive optical elements, especially at large radii. The method of improvement the accuracy of laser pattern generator with circular scanning is proposed. The result is achieved by using a new type angular encoder in it. It’s using allows to measurements of the turning angle and current radial deflections of the angular coordinate laser pattern generator rotor axis simultaneously. For that two measuring patterns – radial raster for measuring angular displacement and ring for measuring linear shift raster in a tangential direction are formed on a single glass basis for one technological process.

Biography

Kiryanov Alexey, Ph.D. (Technical Sciences), head of laboratory Integrated Informational Control System of the Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences (IA&E, SB RAS). Research interests – laser pattern generators, precision mechatronic systems, optoelectronic angular encoder. Author and co-author more than 50 scientific articles, patents for inventions.

Speaker
Alexey V. Kiryanov / Head of laboratory, Institute of Automation and Electrometry,Russia.

Abstract

For the first time a new ternarysemiconductorthin film,have been successfully synthesized by chemical solution deposition process viaultrasonic spray technique,which is CuZnS. This material can be defined as an alloy of CuxS and ZnS, which are two inherently semiconductors of p and n-type respectively.These characteristics make it a very important and interesting materialfordifferent application fields,especially in photovoltaic. The preparation rout of this compound was by the dilution ofCuCl2,ZnCl2 and thiourea in distilled water. Our work focuses on the effect of the multi-deposition runs on the nature and thephysic-chemical properties of the prepared thin films in order to optimize the growth conditions.Different characterization methods have been exploited to study the influence of this parameter, which are: (i) X-ray diffraction (XRD), (ii) Scanning Electron Microscopy (SEM), (iii) Spectrophotometer and (iv) Hall effect measurements. According to this study, we have found that the as deposited films exhibit the two phases CuS and ZnSwith an improvement in the crystallinity; andthe elemental composition seems to be quasi-stoichiometric as the film thickness increases. The SEM micrographs showed that the morphological feature of the films is highly influenced by the deposition time, and the band gap energy is found to be about 1.78 eV for the film grown at the highest deposition runs. Electrical measurements show that the resistivity behavior depends on the film thickness. All these results make CZS film obtained after 4 runs, a very suitable candidate for solar cells.

Biography

Doctor KenzaKamli is the member of“Energy conversion-Laboratory of Semiconductors” at Badji Mokhtar Annaba University, Algeria. She has national and international publications in investigatingand elaboratingof semiconductors thin films. Research interests in development of chemical deposition technics such as Spray ultrasonic and CBD. Elaboration of different thin films semiconductors destined to the electronics and photovoltaic applications in order to their optimization and to find the more adequate characteristics for each application field.

Speaker
Kenza KAMLI / Doctor, Badji Mokhtar University, Algeria.

Abstract

Li-ion accumulators currently need to be charged by being plugged into the grid. A strategy to offer the battery a full autonomy would be to use light to ensure its recharge. Here, we propose a single device, based on mesoporous LixTiO2 thin film as positive electrode and carbon as negative, to both convert and store light energy. The illumination of the nanostructured lithiated anatase electrodes drives lithium ions de-insertion reaction, via the participation of photogenerated holes in the oxidation of Ti3+. A discharge capacity of 440 mAh.g-1 was reached at C/7-rate under illumination [1]. This capacity is higher than the one obtained in dark, and it also exceeds the theoretical capacity of anatase TiO2 (335 mAh.g-1). This tends to confirm that during a discharge performed under light, two reactions happen, i.e. (1) the electrochemically-induced insertion of Li+ into the positive electrode material and (2) the photo-induced extraction of Li+. The photo-extracted Li+ leaves free space for more Li+ to be inserted. This work constitutes a proof of concept that low potential Li-ion batteries can solely be recharged by exposure to light. We also believe that both the mesoporous architecture and the interfaces with the electrolyte can play important roles in the dynamics of the light-induced processes. The impact of these parameters on the photorecharge kinetics has to be understood in a view of making performant device.

Biography

Olivier Nguyen is a third year PhD candidate from the Sorbonne Université and Collčge de France. He graduated from the Ecole Normale Supérieure de Paris, and benefits from a grant of the french doctoral school of Materials Physics and Chemistry.

Speaker
/ Researcher, University College of France, France.

Abstract

Electric and magnetic optical fields carry the same amount of energy. Nevertheless, the efficiency with which matter interacts with electric optical fields is commonly accepted to be at least 4 orders of magnitude higher than with magnetic optical fields. Here we experimentally demonstrate that properly designed photonic nanostructures (figure 1) can selectively manipulate the magnetic versus electric emission of luminescent nanocrystals. In particular, an enhancement of magnetic emission from trivalent europium-doped nanoparticles can only by observed in the vicinity of nanostructures featuring a magnetic field enhancement. Moreover, by controlling the spatial coupling between emitter and nanoresonator using near-field microscopy, local distributions of both magnetic and electric radiative local densities of states can be readily recorded with nanoscale precision (figure 2), revealing the modification of the quantum environment induced by the presence of the nanostructures. This manipulation and enhancement of magnetic light and matter interactions is a turning point in nanophotonics, opening up new possibilities for the research fields of opto-electronics, chiral optics, nonlinear & nano-optics, spintronics and metamaterials, amongst others.

Biography

Mathieu Mivelle became a permanent researcher in January 2016 after being recruited by the CNRS (French National Research Institution). By designing and applying photonic nanoantennas to enhance the electromagnetic near-field, his research focuses on studying the interactions between light and matter at the nanoscale, and in particular the interactions due to the magnetic part of light. Previously, Mathieu Mivelle obtained his PhD in Physics, working on near field optics at the FEMTO-ST institute in Besancon, and worked as a Post-doctoral researcher in the ICFO institute in Barcelona and the Langevin Institute in Paris on the coupling between single emitters and photonic antennas.

Speaker
Mathieu mivelle / Scientist, Pierre and Marie Curie University, France.

Abstract

Coal is a natural nanostructured material. Physical-Chemical properties of coal depend on from the stage of metamorphism. The stage of metamorphism is estimated by a variety amount volatile substance (Vdaf). The pyrolysis process characterised structural transformation of coal under temperature and pressure where physical-chemical properties were changed including paramagnetic properties. In this paper using by SEM, EDX and EPR methods were investigated a morphology of surface, element analysis and paramagnetic properties of a gas type coal (Vdaf = 39-46 at.%) after vacuum annealing at T = 700 0C. SEM analysis data showed, that the surface of coal consists of a large amount pores which were created during vacuum annealing. The carbon content of coal was increased up 95 at. % after the vacuum annealing. EPR spectra consist of two resonance lines L1 and L2 of Lorentz shape after vacuum annealing. At the first time, was observed an untypical behaviour of paramagnetic centres of coal with an interaction of molecular oxygen after vacuum annealing. The strong broadening of the L1 line (Hpp250 G) related to with influence the huge amount oxygen on the structure of coal after vacuum annealing. During of the time, the width and concentration of paramagnetic centres of the L1 line were slowly decreasing after vacuum annealing. This untypical behaviour was related to formation weakly chemical bonds of the carboxyl group. Also was registered increasing intensity of L2 line, which related to the structure relaxation of a chemical bond and diffusion free radicals. The width of an L2 line was not changed. Finally,the same adsorption mechanism of pyrolyzed coal was observed with contacting the vapour of water.

Biography

Serhii Krasnovyd has completed master of Science in Physics at the age of 23 years in the National Technical University of Ukraine “Kyiv Polytechnic Institute” In the age 26 was finished PhD studies in the Institute of Semiconductor Physics of Ukraine. At now time Serhii Krasnovyd is junior researcher in the Institute of Semiconductor Physics of Ukraine. He has published 6 papers in reputed journals. Serhii Krasnovyd took part in the collaboration projects “Marie Curie Actions - International Research Staff Exchange Scheme” Aston University, Birmingham, UK. Serhii Krasnovyd completing his PhD thesis and will start to defending her very soon.

Speaker
Serhii V Krasnovyd SV / PSL Research University Paris,France.

Abstract

With the increased use of photovoltaic electricity generation continuous surveillance the of the system becomes important in order to prevent a partial or complete drop out of supply. Admittance spectroscopy could become a suitable tool for fast failure diagnosis of photovoltaic modules in operation. In a recent work [1] we used a light generated small AC current for admittance studies of single solar cells. This method has advantages compared to conventional small signal admittance spectroscopy. In the later case a DC bias voltage is superimposed by a small sinusoidal AC voltage and applied to the device under test. The AC component of the resulting current then is detected and evaluated by its amplitude and phase relative to the alternating excitation voltage. The bending of the current voltage curve determines the transfer function of the resulting AC current. In many cases only the fundamental order of the current is further processed. In our experiments the illuminated solar cell was terminated with an external resistive load A constant light generated current was superimposed by an alternating component arising from an intensity modulated light source. The resulting AC voltage at the resistive load was detected and evaluated. In this case the transfer function depend on the termination resistor only and ideally is linear. The termination resistor determines the working point on the current voltage curve of the device under test. Experimental instrumentation as well as data evaluation is simple. In my talk I will present results we have obtained so far on small solar modules with intentionally introduced defects.

Biography

V. Schlosser has completed his PhD from the University of Vienna, Austria and postdoctoral studies at the Ludwig Boltzmann Institut für Festkörperphysik, Austria. He is assistant professor at the University of Vienna. He has published more than 70 papers in reputed journals and has been serving as an editorial board member of repute.

Speaker
Viktor Schlosser / Faculty of Physics, University of Vienna, Vienna, Austria

Abstract

Ab initio calculations were used for electronic structure of the ideal and defective semiconductors Cd1-xMnxTe (x=0.01-0.1). It was defined band gap, density of states, total energy, magnetic moments, number of electrons, Fermi levels, defect formation energies and threshold energies. It is determined that the band gap in Cd1-xMnxTe increases linearly with an increase in the Mn concentration, but there occurs an insignificant decrease in the lattice parameter with Mn concentration increasing. It is determined that defects lead to an increase in the band gap width, formation of additional magnetic moments, local levels in the forbidden band, and also to a change in the type of conductivity which are confirmed experimentally. Cd1-xMnxTe epitaxial films were obtained on glass substrates in a vacuum (12)10-4Pa by the Molecular Beams Condensation method. It is determined the optimal conditions for the production of epitaxial films with perfect structure and a clean, smooth surface, without the inclusion of the second phase by using of additional source of Te vapor. Absorption and transmission spectra of Cd1-xMnxTe (х=0.07) epitaxial films on glass substrates of thickness d=15μm and 22μmhave been studied. The band gap width of Cd1-xMnxTe (х=0.07) epitaxial films was Eg=1.73eV.The studies of the effect of γ-radiation on the optical properties of epitaxial films showed that there occurs a change in the band gap width, absorption and reflection coefficients, which can be explained by the appearance of the local levels from the formation of defects. Results corresponds to our theoretical calculations

Biography

Matanat Mehrabova has completed her PhD from Institute of Space Research, Baku, Azerbaijan and postdoctoral studies from Institute of Radiation Problems of Azerbaijan National Academy of Sciences, Baku, Azerbaijan. She is the leading researcher in theInstitute of Radiation Problemsof ANAS. She has published 150 scientific papers, more of them in reputed journals and has been serving as an editorial board member of repute.

Speaker
Matanat Mehrabova / Researcher,National Academy of Sciences,Baku, Azerbaijan

Abstract

In this paper, a novel nanojet with dual off-center nanoengines consisting of Au, Ni and Pt is designed, as shown in Figure 1. Au and Ni are shaped as concentric disks with 12 µm in diameter. The thicknesses of Au- and Ni-disks are 0.2 and 0.1 µm, respectively. Two identically off-center Pt nozzle nanoengines form cylindrical chambers and are symmetrically distributed on the base of the Au-Ni disk. The diameter, bottom-thickness, wall-height and wall-thickness of the nozzle nanoengines are 3, 0.3, 1.5 and 0.3 µm, respectively. The propulsion mechanism for the Au-Ni-Pt nanojet is shown in Figure 2. Without the presence of hydrogen peroxide (H2O2), the nanojet suspended in deionized (DI) water is stationary. After the addition of H2O2 into DI water, oxygen (O2) bubbles are generated at the Pt-surface (the nanojet and O2 bubbles have a joint velocity of v1). The generated O2 bubbles grow bigger (growing state in Figure 2(a)). At this state, the nanojet and O2 bubbles have a same velocity of v2. When O2 bubbles reach a certain diameter, they detach from the surface of the nanojet (detaching state in Figure 2(a)). The nanojet has a velocity of v3, while O2 bubbles have a different velocity of v0. According to the Momentum Conservation Law and the Momentum Theorem, a driving force F’drive is generated, resulting from momentum change induced by the detachment of O2 bubbles, to thrust the nanojet propelling forward. The nanojet is equipped with two identically and symmetrically distributed off-center nanoengines, resulting in the total driving force Fdrive is well aligned with the drag force Fdrag. Hence, the Au-Ni-Pt nanojet propels forward linearly. At steady state, the nanojet will continuously propel forward at a speed of v.

Biography

Liangxing Hu received his Bachelor Degree from Harbin Institute of Technology, China, in 2012. He is currently a Ph.D. candidate under the supervision of Prof. Jianmin Miao and Prof. Gerhard Grüber at Nanyang Technological University, Singapore. His research interest is the characterization of catalytic nanomotor based NEMS device for drug delivery

Speaker
Liangxing Hu / Researcher, Nanyang Technological University, Singapore

Abstract

Modifications of the surfaces of bismuth thin films with a layer of antimony were carried out to study the changes in adhesion in recrystallized films. The report will describe the possibility of reducing the possible thickness of the recrystallized film by using a sublayer. The surface roughness is altered in the presence of a sublayer and without it. The results of measuring the galvanomagnetic properties block and single films types of structures on substrate of mica: bismuth film, antimony layer as the underlayer film of bismuth.

Biography

Natallya Kablukova received her candidate’s degree in physical and mathematical sciences in Herzen State Pedagogical University of Russia. She has published 11 papers in reputed journals.

Speaker
Natalia Kablukova / Herzen State Pedagogical University of Russia, Sankt-Petersburg, Russia

Abstract

To study the classical size effect, perfect objects are required. The creation of an ideal lattice in thin films is possible not by a large number of methods: thermal deposition with certain substrates and the band recrystallization method [1,2]. These methods make it possible to obtain bismuth and bismuth-antimony films with a single-crystal lattice. In this case, the manifestations of the classical size effect are possible on not very ideal objects, for example, on crystals lattice with twins. And also the dimensional effect exists at grain boundaries in block films. These and other features of the thin-film state make it possible to obtain unique properties when using a small amount of semimetal compounds in combination with a thickness and a substrate. In this paper, we will dwell on the methods for obtaining single-crystal films, the appearance of the classical size effect in the structures obtained on the basis of bismuth and bismuth-antimony.

Biography

Natallya Kablukova received her candidate’s degree in physical and mathematical sciences in Herzen State Pedagogical University of Russia. She has published 11 papers in reputed journals.

Speaker
Natalia Kablukova / Herzen State Pedagogical University of Russia, Sankt-Petersburg, Russia

Abstract

Undoped and lithium doped zinc oxide thin films were deposited by electrodeposition technique from aqueous solution onto ITO substrates at optimum conditions. The variations of the structural, electrical and optical properties with the doping concentration were investigated. XRD analysis showed typical patterns of the hexagonal ZnOstructure for both doped and undoped films. The films were polycrystalline with the (002) preferred orientation. No diffraction peaks of any other structure were found. The grain size and optical band gap were evaluated for different doping concentrations. The films with 5.10-6 M Lithium had a high crystallographic quality and a resistivity of 3,9.10-4 Ω.cm with an energy band gap of 3,3 eV. It is very obvious that ZnO-Li films fabricated by electrodeposition at optimum conditions are suitable for optoelectronic applications, especially those requiring transparent electrodes.

Biography

Speaker
EL HICHOU Ahmed / University Cadi Ayyad

Abstract

Great attention has been devoted to the preparation and characterization of organic-inorganic hybrid perovskites (OIHs). These advanced materials can provide low cost materials for self assembly quantum well applications, fuel, solar cells, batteries, electronic and optoelectronic applications. Diammonium halide perovskite hybrids [NH3(CH2)nNH3]MClxBr4-x ; x= 0, 2, 4; M= Co, Mn; n= 4-9 allow mixing of organic and inorganic components in one molecule which possesses a property that may not exist in either of the parent components. Possibilities could elaborate hybrid materials in terms of processing new chemical and physical properties according to the application needed. Single crystals were prepared by slow evaporation. The complete structure information as well as lattice parameters for Co series n= 4-9 are provided, and for n = 5-6 for Mn hybrid. Differential thermal analysis DSC shows reversible order - disorder transition for both the Co and Mn hybrids. Permittivity studies confirm the phase transition. The optical properties of Co series show strong absorption in the visible range from 500 to 700 nm. The calculated band gap energy using Kubelka-Munk equation ranges from 1.75 eV for [NH3(CH2)9NH3]CoCl4 denoted C9CoCl to 1.73 eV for [NH3(CH2)5NH3]CoCl2Br2 denoted C7CoCB. These values are very promising for lead free hybrid perovskite solar cell. Electronic structure and chemical bonding in Co, Mn OIHs were studied by X-ray (XPS) photoemission spectroscopy. All elements of Co and Mn organic-inorganic hybrid perovskites were found in XPS spectra and can be related to the peaks of N1s, C1s, Co2p, Mn2p and Cl2p. Wide peak of C1s spectra was related to the chemically unequivalent C atoms in the compounds. The spectrum of the N1s level with binding energies of 401.2 eV was assigned to NH3-group. The analysis of Co2p states in Co OIHs compounds shows the divalent state of Co with a typical satellite structure.

Biography

Speaker
Seham K Abdel-Aal / Faculty of Science, Cairo University, 12613 Giza, Egypt.

Abstract

Nanocrystals (NCs) of wide-gap semiconductors A2B6, owing to their high luminescence quantum yield, are widely used in different areas of optical- and nanoelectronics for creating the light-emitting devices, night vision devices, solar batteries, as fluorescent markers for medical diagnosis and so on. Nowaday challenge is development of the technologies for formation of nanostructures directly in polymer matrices.This report describes the in-situ synthesis of NCs of ternary semiconductors Cd1 xCuxS and Cd1 xZnxS inside polymer films, as well as the results of investigations of their structure and optical properties. It has been established that, in the case of Cd1 xCuxS within a large range of Cu to Cd ratios, the hexagonal structure is dominating in the NCs synthesized, while in the case of Cd1 xZnxS the dominating crystalline structure of NCs corresponds to the cubic structure of CdS. However in both cases formation of separate phases of either CdS and CuS or CdS and ZnS has not been revealed. The photoluminescence (PL) spectra of both the Cd1 xCuxS NCs and the Cd1 xZnxS NCs consist of two impurity bands and an exciton band; and their intensity depends on the NCs composition of these semiconductorsin different ways. For the Cd1 xCuxS NCs, a decline of the impurity PL intensity is observed with increasing Cu content. On the contrary, for Cd1 xZnxS NCs, an increasing Zn content in the NCs results in an increase in the intensity of the impurity PL. The possible reasons for these phenomena are discussed.

Biography

Speaker
Viktor Tokarev / Institute of Semiconductor Physics, Ukraine.

Abstract

Detailed theoretical researches of propagation of charge carrier fluxes through boundary of solid-state structure and near to it taking into account dispersion of carriers on boundary is actual and is very claimed by practice. Such researches are especially important in case of presence in solid-state structure of thin layers when at propagation of the fluxes there is their nonsingle scattering on both boundaries of the layer and the usual phenomenological description appears not quite adequate. It also considerably influences properties of a layer as a whole as scattering of differential fluxes of charge carriers on the boundary, depending on its submicronic configuration and a state, usually essentially differs from scattering of fluxes in the thin of layer. This fact is necessary for regarding both in balance, and at its lack. Effects of detailed examination of distribution of differential and integrated fluxes of charge carriers within the limits of the kinetic theory taking into account dispersion of fluxes on boundaries of a plane-parallel layer of solid-state structure are given at the isotropic dispersion relation. In boundary conditions in an integrated view scattering of all interior and all exterior impinging on boundary from the adjacent layers of differential fluxes of charge carriers was considered. It is shown that in balance and at its infringement propagation of differential fluxes of charge carriers at boundary and through boundary, including their loss on boundary, and also a distribution function of charge carriers on a wave vector and co-ordinates crossly in coordination depend on a configuration and a state of a layer’s boundaries, which are characterized by probability of fluxes dispersion. Compounded on layers of structure the solution allows to spot all differential and integrated fluxes of charge carriers in any location of structure section, and also loss of charge carriers on each boundary between layers. The given researches are necessary not only for the correct understanding of a physical pattern of propagation of charge carriers fluxes in a layer, depending on a submicronic structure and a state of its boundaries, but also for correct interpretation of the experimental data, a concerning layer or the structure containing layer.

Biography

Kerimi Muhamed Begenchevich - has graduated from the Leningrad university, chair of quantum mechanics, also has started to work at Physico-technical institute of Turkmenistan Academy of Sciences in 1976. Candidate work was carried out at the Leningrad Physical-technical institute of a name of A.F.Ioffe AoSci by the USSR where I has been attached. The dissertation theme is connected with photon carrying over of a charge carriers in grade band gap semiconductors (or in the smooth heterostructure) GaAlxAs1-x type. In 1987 has received a scientific degree of the candidate of physical and mathematical sciences. Recently I work in the Center of technologies Turkmenistan state AoSci in laboratory Nanotehnologies as the leading research assistant. For all operating time it is published more than 80 materials of scientific works, including materials of the international scientific conferences. In specialized journals with high scientific reputation it was published not much.

Speaker
Kerimi Muhamed Begengchewich / Centre of technologies of the Turkmenistan state Academy of Sciences, Ashgabat, Turkmenistan

Abstract

Silicon nanocrtstals embedded into insolating SiO2 matrix have perspectives for variety of applications, namely: nanocrystal nonvolatile memory, resonant-tunneling structures, single electron transistors etc. The photoelectric properties of layered SiO2-SiO2(Si)-SiO2 structure on silicon substrate have been investigated in this work. At the beginning the ultrathin SiO2 layer with different thickness in the range of 2 – 15 nm has been thermally grown on silicon wafer in dry oxygen. On the second stage the silicon enriched SiOx (x<1) film has been deposited by ion-plasma sputtering (IPS) of Si target in oxygen and argon ambient. The upper control SiOx (x2) layer was also deposited by IPS method. The following high temperature annealing at T=1100 C caused phase separation of middle SiOx film and, as a result, the Si nanocrystals have been formed. After that the transparent conductive layer (ITO) has been deposited on the top of multilayer structure. The charging of Si nanocrystal has been performed by pulse of positive voltage. Negative charge captured on nanocrystals changes the surface potential and in such a way the upper energy band bending was created at the surface region. The following illumination of such structure by light generates the electron-hole pairs which are separated by surface energy barrier. The difference of potentials has been observed between front and back sides of the structure. The influence of the trapped charge value on the potentials difference and its changing with time of illumination has been investigated. The observed effects can be used in novel solar cells and photodetectors.

Biography

Volodymyr Lytovchenko was born in Ukraine, Kiev district (24.12.1931). Graduated radio-physical faculty Kiev State University (1955) on semiconductor subject, postgraduated in of Institute Physics (1956-59), obtain Dr. (1960), Dr. of Sci. (1970), member-corr. Nat. Acad. Sci. of Ukraine (1985), Prof. Kiev Univ. (1974), Soros Prof. (1980), President Ukr. Phys. Soc (2004-2012), member of editorial board some of international phys. journals (Surface Science, Thin Solid films; Low. Dim.Str. Ukr. Phys. Journal etc. Published 11 monographs (incl. on Surf. Electron Transportin in Oxford Sci. Publ.). Now is a chief of Phys. Sci. Surface Dpt., Inst. Semiconductor Phys. Ukr. Acad. of Sci.

Speaker
Volodymyr Lytovchenko / Institute of Semiconductor Physics, National Academy of Science of Ukraine

Abstract

Is presented the review of experimental and theoretical studies of nano-films PECVD deposition with advanced DC cylindrical magnetron systems in the Department of Gas Electronics of Institute Physics of NASU. The plasmaoptical model of cylindrical magnetrontype gas discharge is presented[1-3]. The model is based on the assumption about the presence of three quasiautonomous regions in the diode gap of the discharge, at that the regions possess essentially different mechanisms of current transfer. Is shown a possibility of nondestructive online monitoring of film quality with optical emission spectroscopy. The optical monitoring based on analysis of the spectrum lines provides extensive information and makes it possible to simultaneously trace the behavior of several components of the gaseous medium in which a reactive plasma is generated. The optical method of controlling the plasma medium of the inverted cylindrical DC magnetron can be used to detect the working point of deposition, for example, of titanium oxide or titanium nitride films, including stoichiometric. The variation of deposition conditions allows variating different characteristics of deposited film

Biography

Speaker
Dobrovolsky Andriy / Institute of Physics, Ukraine

Abstract

Spinel is one of the largest groups of inorganic compounds existing in nature and also draws great attentions since this close-packed structure possesses many enormous properties, which could apply in various industrial fields like magnetic materials [1], electrical materials [2], high frequency devices [3]. Due to their potential usage in various technological applications studies about spinel type structures are promising. So, in this study we have studied structural, electronic, optical and vibrational properties of different spinel type structures using density functional theory calculations together with PBE exchange correlational functional. All electronic structure calculations are carried out using VASP software. From band structure calculations it has been observed that studied spinels have certain band gaps which make them good candidates for semiconductor applications.

Biography

Salih Akbudak has completed his PhD from Hacettepe University Institute of Science, Nanotechnology and Nanomedicine Division, TURKEY in March 2016. During his doctoral studies he has been a visiting scholar in Fritz-Haber Institute of Max-Planck Society, Berlin, GERMANY between 1 september 2014 and 1 september 2015. He has carried out theoretical calculations of his PhD thesis in Fritz-Haber Institute of Max-Planck Society. He has published a total of 9 papers and 7 of them are in SCI journal.

Speaker
Salih Akbudak / Department of Physics, Faculty of Arts and Sciences, Adiyaman University, Turkey.

Abstract

The lowering of thresholds for exposure to certain contaminants, the prevention of epidemics and the early diagnosis of severe pathologies such as cancer are major public health challenges that require ever more efficient detection tools. It has recently been demonstrated that nanostructuring of the sensitive zone of the sensors makes it possible to improve their performance significantly. The gain in sensitivity results both from the increase of the accessible surface and from a better orientation of the capture1 ligands. The nanoscale structuring of the sensitive zone of a sensor can be achieved by the immobilization of nanoparticles at its surface. Due to the excellent control of the interfacial reactions provided by the electrochemical techniques, the electrochemical grafting of gold nanoparticles appears perfectly adapted to improve the sensitivity of the detection. This strategy requires the synthesis of nanoparticles functionalized by electroactive groups. In this perspective, we have adapted, by adapting the Brust2 protocol, the synthesis of gold nanoparticles coated with a layer of organic thiols terminated by an aromatic primary amine. The resulting nanoparticles form stable colloids at pH <3. The presence of the primary aromatic amine functions is essential since their conversion to the diazonium salt by a diazotization reaction in an acid medium allows the electrochemical grafting of the entities carrying these functions by reduction of the diazonium salts as the work of Pinson and Bélanger3. The in situ conversion of the aromatic primary amine functions carried by the gold nanoparticles into the phenyldiazonium salt leads to the grafting of the gold nanoparticles on the cathode. The grafting of gold nanoparticles was validated by electrochemistry, elemental analysis and atomic force microscopy (AFM) when grafting took place on vitreous carbon, indium tin oxide (ITO) electrodes, And golden terrace. The nanostructuration which results from the grafting of these nanoparticles on the gold surfaces has made it possible to improve by a factor of 2 the sensitivity of the Biotin / Streptavidin recognition test demonstrated by chemiluminescence of luminol.

Biography

Speaker
Ali H. Adabo-kako / Researcher, University of Franche-Comté, France.

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