cfaed Seminar Series
cfAED Seminar Series
Prof. Stephan Roche , Catalan Institute of Nanoscience & Nanotechnology, Universitat Autònoma de Barcelona, Spain / ICREA, Institució Catalana de Recerca i Estudis Avancats, Spain
Understanding Charge Transport in Graphene-based Materials: From Concepts to Applications
, 13:00 - 14:30
TU Dresden, Hallwachsstraße 3, Room HAL 115 , Hallwachsstraße 3 , 01069 Dresden
In his talk, Prof. Roche will discuss charge transport in complex forms of graphene (chemically reduced graphene oxides and polycrystalline graphene), of relevance for current and future applications in flexible electronics, transparent electrodes, energy harvesting devices and spintronics. The key role of predictive modelling (comprising multi-scale simulation) will be outlined, as enabling tool for new discoveries and for material benchmarking and quantum device profiling.
One will focus on the issue of structural imperfections introduced either during the wafer-scale production of graphene with chemical growth (CVD), or through the mechanical/chemical exfoliation and chemical transfer to versatile substrates. Fundamental properties of charge transport in polycrystalline graphene, accounting the variability in average grain sizes and grain boundaries (as observed in real samples grown by CVD) will be discussed, together with their relevance for device optimization and diversification of technological functionalities, such as gas sensors, transparent electrodes and so forth.
Prof. Roche studied Theoretical Physics in the Université Joseph-Fourier (UJF) and Ecole Normale Supérieure in France, and received a Ph.D. in Physics in 1996 working at the French CNRS. After several (postdoc) research stays in Japan and Spain, he was appointed in 2000 as a Professor Assistant at the UJF and then as a Researcher at the Commissariat à l´Energie Atomique-CEA in 2004. The same year, he received the “Habilitation à diriger des Recherches” from the UJF. During his stay at the Institut of Nanosciences and Cryogenics (INAC) of CEA, he was in charge of the coordination of the “quantum simulation platform” of the CHEMTRONICS program, and involved in the preparation of the NANOSIMULATION CEA program. In 2009, he was awarded the Friedrich Wilhelm Bessel prize by the Alexander Von-Humboldt Foundation (Germany) and worked 6 months at TU Dresden. He is currently ICREA Research Professor and head of the Theoretical and Computational Nanoscience Group of the ICN which focuses on the theoretical understanding of quantum transport phenomena from the molecular to the mesoscopic scales.