ICEESM2017 Keynote Speakers

Prof. Jordi Llorca

 Director, Institute of Energy Technologies and Centre for Research in NanoEngineering
Technical University of Catalonia, Spain

Biography: Born in Barcelona in 1966, Jordi Llorca graduated and earned his PhD in Chemistry at the University of Barcelona, where he was later appointed Associate Professor. In 2005, he joined the Technical University of Catalonia (UPC) as Professor and in 2014 he became Full Professor as Serra Húnter Fellow. He has conducted research at the Univ. of New Mexico (US), CNRS (France) and has been Invited Scholar at the Univ. of Udine (Italy), Univ. of Auckland (New Zealand) and CONICET (Argentina). He has received the Distinction of Generalitat de Catalunya to the Promotion of the University Research in 2003, the Humbert Torres Prize in 2003 and the ICREA Academia in 2009 and in 2014. From 2011 to 2014 he has been Director of the Institute of Energy Technologies (INTE) at UPC and currently he is Director of the Centre for Research in NanoEngineering (CRnE) at UPC. He has published over 220 scholarly articles and authored 9 patents. Prof. Jordi Llorca is working on the design and manufacture of new devices at the nanoscale for conducting chemical and photochemical reactions aimed at the generation, purification and separation of hydrogen for portable fuel cells as well as other processes related to energy and environmental applications.

Title of Speech: Nanofaceted catalysts for energy applications 

Abstract: The engineering at nanometer level of the size, the shape and face of individual particles is of great importance to control the surface chemistry of oxide and metal nanoparticles, which are the key ingredients in catalysis recipes for energy applications. In the last two decades, the nanoscale approach to the understanding of material chemistry and its application in catalysis for energy has experienced an unprecedented growth due to the development of advanced characterization techniques and the successful combination of theory and experiment in the design of heterogeneous catalysts. Catalysts based on ceria (CeO2) and titania (TiO2) are good examples where the fundamental studies at nanoscale level offer a precious tool for obtaining materials with enhanced properties for a number of energy applications, like the production of hydrogen by reforming reactions and by photochemical processes, respectively.  

 

 

ICEESM2017 Plenary Speakers

Prof. Tatiana Perova

Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Ireland  

Biography: Prof. Perova completed her PhD at Leningrad State University in 1979. She joined the staff of Vavilov State Optical Institute (St. Petersburg, Russia) in 1979, where she was involved in the characterization of condensed matter using far-infrared and Raman spectroscopy. In 1998 Prof. Perova took a position of the Research Director of Microelectronic Technology Laboratory (MTL) at Trinity College Dublin and from 2007 she is the Director of MTL. Since 2011 she is a Fellow of Trinity College Dublin and since 2013 she is a Fellow Emeritus. Prof. Perova’s research interests are principally related to the optical characterization of condensed matter, with an emphasis on the analysis of the composition, stoichiometry, molecular orientation, stress and strain in amorphous solids, liquid crystals, photonic crystals and semiconductors. She has over 270 publications in books and referred journals. Prof. Perova has given numerous invited talks at Universities and Research Institutes in Europe, Russia, Australia and Mexico and several invited and keynote talks at International Conferences. Prof. Perova is acting as a Reviewer Editor for the journal Frontiers: Frontiers in Materials and is a member of the Editorial Board of Asian Chemistry Letters journal.

Title of Speech: One- and two-dimensional silicon photonic crystals for integrated smart devices 

Abstract: Applications of photonic crystals (PhCs) of different dimensionality (i.e. 1D, 2D and 3D) enormously expanded for the last two decades in different areas of science and technology. These applications include, but not limited to, chemical and biological sensors, environmental monitoring and industrial process control, photovoltaics, lab-on-chip, variety of electro-optical devices for telecommunication as well as for defense and security systems and other. In addition to that a large number of research also have been focused recently to application of PhCs, based on semiconductor materials such as Si, Ge and Sn, in mid-infrared, far-infrared and THz regions.
In this presentation the review of our investigations in the recent years in the area of modeling, fabrication and characterizations of photonic devices based on 1D and 2D Silicon photonic crystals and their composites will be given. A particular attention will be paid to the photonic structures based on 1D Si PhC-liquid crystal composites as well as multi-layer 1D photonic crystals, which demonstrate the unique optical properties. Their applications for sensing and micro-fluidic devices will be demonstrated (see, for example,). The advantages of the latter photonic structures are: the large refractive index contrast, in-plane moulding of the light flow, the possibility to fabricate a composite photonic structures by filling the grooves with different compounds and compatibility with the current semiconductor processing techniques.  

 

Prof. Witold Daniel Dobrowolski

Institute of Physics Polish Academy of Sciences, Warsaw, Poland 

Biography: Dr. Witold Dobrowolski is a Professor at the Institute of Physics of the Polish Academy of Sciences. He has spent nearly all his academic career at this Institute. He conducted research on narrow gap semiconductors and diluted magnetic semiconductors (called also semimagnetic semiconductors). His principal scientific interests are: (a) Physics of crystal growth and material processing of compound semiconductors, alloys, and semimagnetic crystals;
(b) Electronic transport phenomena, magneto- and quantum transport in semiconductors;
(c) Narrow-gap semiconductors - band structure, impurity levels, transport phenomena;
(d) Semimagnetic semiconductors - electronic and magnetic properties, magnetic phase diagram.
Current research interest covers magnetic interactions in III-V, II-VI, and IV-VI compounds (bulks, thin films, and nanoparticles), mutual interactions between magnetic ions and free carriers.
He has co-authored more than 200 scientific publications and a few book chapters.
He is editor-in-chief of Acta Physica Polonica A.

Title of Speech: Superparamagnetic and ferrimagnetic behavior of nanocrystalline ZnO(Mn) 

Abstract: In the last two decades a lot of attention has been devoted to ZnO due to their potential applications. ZnO has been identified as a promising host semiconductor for potential spintronic applications in high temperatures. Even though ZnO doped with transition metals (TM) have been widely investigated, the reports to date have been contradictory. Magnetic properties of ZnO:TM strongly depend on the preparation method, condition of preparation, concentration of oxygen vacancies and defects, post-treatment, existence of magnetic secondary phases. Different magnetic behavior, like ferromagnetic, antiferromagnetic, spin-glass, superparamagnetic have been reported. Recently, superparamagnetic properties, are of great interest due to the perspectives of their use in biomedicine, eg.: magnetic resonance imaging (MRI), magnetic microsensors, magnetically guided drug delivery, cell-, DNA- and protein- separation, hyperthermia and radiotherapy in vivo.
The primary aim of the present paper is the study the superparamagnetic behavior of the of Mn-doped ZnO nanoparticles by use of dynamic magnetic susceptibility measurements. We examined the effect of manganese doping of ZnO nanocrystals on the structural and magnetic properties of the resultant nanosized material. We have studied the magnetic properties of nanocrystals of ZnO:MnO prepared in the full composition range (from 5 to 95 wt. %) by traditional wet chemistry method. The results of systematic measurements of AC magnetic susceptibility as a function of temperature and frequency as well as DC magnetization are reported. We observed two different types of magnetic behavior depending on the concentration doping. For samples with low nominal content (up to 30 wt.% of MnO) superparamagnetic behavior was observed. We attribute the observed superparamagnetism to the presence of nanosized ZnMnO3 phase. For nanocrystals doped above nominal 60 wt.% of MnO ferrimanetism was detected with TC at around 42 K. This magnetic behavior we assign to the presence of nanosized Mn3O4 phase.  

 

Prof. Yuri V. Vorobiev

Centro de Investigación y de Estudios Avanzados del IPN, Unidad Querétaro Libramiento Norponiente 2000, Real de Juriquilla, 76230 Querétaro, MÉXICO 

Biography: Yuri V. Vorobiev obtained his Master Degree in Radio physics from Kiev State University (Kiev, Ukraine) in 1959, his PhD in Physics and Mathematics from Kiev State University in 1966, and Degree of Dr. Sci. in Physics of Semiconductors and Dielectrics from Institute of Semiconductor Physics of Ukrainian Academy of Science in 1984.
In 1986 became a full professor of National Polytechnic Institute NTUU KPI of Kiev. Since 1996 Professor Titular of CINVESTAV-Queretaro, that is a Material Research Center of National Polytechnic Institute of Mexico. Authored over 200 publications in books and referred journals, 10 patents, 4 textbooks, and supervised 46 Master and 10 PhD theses. The area of his scientific interests includes optoelectronics, semiconductor physics, devices and materials for solar energy conversion.
Prof. Vorobiev is a member of Ukrainian Engineering Academy and Academy of Sciences of High School of Russia. In 2005 obtained Award of Premio Nacional de CONAE, Mexico, for the best project in Renewable Energy Sources.

Title of Speech: Effects of nano-structurization upon optical properties of chalcogenide semiconductor materials for solar cells and corresponding cell structures 

Abstract:  Solar energy converters based on CdS/CdTe heterojunction occupy a solid position in the market of renewable energy devices (the second most abundant photovoltaic technology in the world marketplace). The other chalcogenide materials, like CdSe, ZnSe, PbS, PbTe etc. are also of great interest for solar cell applications (some of them have shown an effect of multi exciton generation, other can be part of multi-junction converters). These materials are not expensive contrary to III-V semiconductors normally used in multi-junction cells, and can be produced by economic techniques like CBD (Chemical Bath Deposition) and its recent versions (SILAR - Successive Ionic Layer Adsorption and Reaction, and PCBD - Photo Chemical Bath Deposition), all of them ammonia-free and ecologically friendly. Materials obtained by these methods are usually nano porous; the corresponding quantum confinement affects the band gap value that can be used for monitoring of this important parameter. In this manner, the fundamental absorption edge can be shifted towards the desired position.
We investigated the corresponding band gap variation depending upon the preparation conditions in CdS, CdSe, PbS and PbSe; for theoretical description of nanoporous systems studied we used original approach to the solution of the Schrödinger equation utilizing so-called Mirror Boundary Conditions (see our publications [1-3]). This approach allows reasonably simple analytical description of nano structures of different geometries (sphere, prism, pyramid, cylinder etc). To illustrate an effect of porosity upon the band gap, we mention that in PbS the band gap values observed were from 0.4 to 0.8 eV. Our experimental solar cell with CdS/PbS active bilayer had shown the external quantum efficiency EQE = 25 %.
In Glass/ITO/CdS/CdTe/Graphite solar cell we found formation of two-dimensional quantum wells near interfaces between ITO/CdS and CdS/CdTe films (XPS study, Kelvin Probe and photoluminescence) causing the blue shift of electronic transitions. Analysis of energy band diagram of the structure has shown that the CdS/CdTe bilayer is of n+-n character and has several potential barriers that are responsible for the photo voltage generated by illumination. In addition, an effect of traditional CdCl2 treatment upon the cell´s parameters was investigated, and its mechanism proposed. In general, the quantum confinement effects caused by nano-structurization of semiconductor films employed in solar energy converters have positive influence upon the converters´ parameters.
1. Y.V. Vorobiev, P.M. Gorley, V.R. Vieira et al., Physica E 42 (2010) 2264.
2. Yu.V. Vorobiev, Bruno Mera, V.R. Vieira et al., Nanoscale Research Letters 7 (2012) 371.
3. T.V. Torchynska, Y.V. Vorobiev, P.P. Horley et al., Physica B 453 (2014) 68.

 

ICEESM2017 Invited Speakers

Dr. Anna Baldycheva

University of Exeter, UK  

Biography: Prof Anna Baldycheva completed her BSc with Honors at Saint Petersburg State University in 2008 and PhD at University of Dublin, Trinity College in 2012. After Postdoctoral Position at Massachusetts Institute of Technology she took a position of an Assistant Professor in 2D Optoelectronic materials at the University of Exeter in 2014 where she is currently leading a highly interdisciplinary research group “Opto-Electronics Systems Laboratory” [www.baldychevalaboratory.com]. Prof Baldycheva’s research interests span from the development of new 2D material based layered and liquid crystal nanocomposites to the engineering of 2D material hybrid opto-electronic and integrated electronic-photonic devices for application in energy harvesting, communications, and bio-chemical sensing. She has over 50 peer-reviewed publications, invited talks and conference proceedings since 2010. Prof Baldycheva is an associate editor of the Nature Scientific Reports and is serving on the board of the Engineering and Physical Science Section of the Royal Microscopy Society.

Title of Speech: Graphene and 2D Materials for Electronics, Photonics and Optoelectronics 

Abstract: Graphene is an emerging material for electronics, photonics and optoelectronics due to unique physical properties such as high electrical conductivity, optical transparency and mechanical flexibility. These properties can be further enhanced or tailored to fit specific device functionalities by means of chemical functionalization. A recent example of the potential of chemical functionalization is the intercalation of few-layer-graphene with FeCl3 (dubbed GraphExeter), developed by Prof Craciun at the Centre for Graphene Science at Exeter. In the past years, our Graphene Centre demonstrated that this material is the best performing carbon-based transparent conductor, with resilience to extreme conditions and potential for transparent photo-detectors, flexible photovoltaic and organic light emitting devices and foldable light-emitting devices. Among emerging optoelectronic materials, fluid-dispersed atomically thin 2D nanocomposite materials demonstrate great promise for the next generation of multi-functional optoelectronic systems with a wide range of important applications, such as renewable energy, optical communications, bio-chemical sensing, and security and defence technologies. The most recent highlight in this new research is the first demonstration of 2D materials optofluidic systems- a novel device concept for graphene and 2D materials optoelectronics and integrated photonics developed at the Opto-Electronic Systems Laboratory (PI: Prof Baldycheva) at the Centre for Graphene Science.
In this talk I will review our latest developments in the use of graphene and functionalized graphene for electronics, photonics and optoelectronics. I will present our recent studies on the use of high quality graphene for next generation light emitting devices and for flexible, wearable touch-sensors. I will review our recent demonstration of 2D heterostructures for video-frame-rate imaging applications8, intelligent design of 2D devices and GraphExeter photodetectors for high-definition sensing and video technologies. I will also present our most recent results on dynamically controlled three-dimensional self-assembly of suspended 2D liquid exfoliated nano-flakes, which provides a breakthrough route for technological realization of 2D material based 3D device architectures.