Date & Time : March 2nd (mon) 2015, 10:00-11:45
Place : Room D-307, Faculty of Science

10:00-10:45
“Energy Band Modulation in Graphene”
Prof. Gap Soo Chang
Department of Physics and Engineering Physics, University of Saskatchewan, Canada

2D Dirac materials, such as graphene, silicene and germanene, have been a subject of intense research in recent years due to their superior electric, thermal and mechanical properties to conventional condensed matter system. Despite recent progress in the development of graphene in electronics for a wide range of device applications, utilizing graphene effectively in semiconducting devices is limited by difficulties in engineering it with a reproducible and tunable band gap. The Chang group (Advanced Materials/ Devices Research (AMDR) laboratory) has explored new feasible approaches with less complexity to control the band structure of 2D Dirac materials in scalable manner which would open the path for high performance graphene electronics.
In this presentation, examples of recent approaches to the energy band modulation of graphene will be reviewed and X-ray spectroscopic studies on graphene done in the Chang group will be discussed.

10:50-11:35
“Photoelectrochemistry at Semiconductor Surfaces”
Prof. Derck Schlettwein
Institute of Applied Physics, Justus-Liebig-University Gießen, Germany

The basics of semiconductor electrochemistry are reviewed and implications to present device development are discussed. A historic view into the early days of photoelectrochemistry and into the important steps in the understanding of the related electrode reactions serves to develop the boundary conditions for efficiently working devices of dye-sensitized solar cells (DSSC), solid-state dye cells (ssDSC) and the different kinds of recently proposed perovskite-based solar cells. The talk is focussed on explanation of the working principles mainly based on results reported in the literature but some reference will also be given to results from our lab in Gießen.