报告题目：Defects in Zinc Oxide
报告人： Associate Prof. Francis C. C. Ling（凌志聰）
报告时间：2014年10月29日（周三）上午10:00
报告地点：曹光彪楼主楼326
Abstract: ZnO is a wide band gap semiconductor having excellent properties for fabricating optoelectronic devices operating at the wavelength of ultra-violet (UV). The realization of fabricating UV optoelectronic devices with ZnO based technology is hindered by the asymmetric p-type doping difficulty, which is related to the poor understanding of the defects, defect compensation, and defect control in ZnO materials. With aim to gain the knowledge defect control, our research group has been working to understand the defects in ZnO related structures, their influence on electrical, optical and magnetic properties. To obtain a comprehensive picture, defects in ZnO are characterized by the multi-spectroscopic approach including positron annihilation spectroscopy (PAS), deep level transient spectroscopy (DLTS), photoluminescence (PL), X-ray photoelectron spectroscopy, and Raman spectroscopy. In the present seminar, I will focus the discussion on our results of studying the p-type conductivity of As-doped ZnO, and the Zn-vacancy associated green luminescence and near-band-edge emission in undopedZnO. .
报告人简介：
Dr. Francis Chi Chung Ling is an Associate Professor at Department of Physics, The University of Hong Kong. He obtained the B.Sc. (1990), M.Phil. (1993), and Ph.D. (1996) from The Univerisity of Hong Kong. Then he worked at The University of Hong Kong, from an instructor to lecturer to assistant professor, and as an associate professor from 2006. Now he is the fellow of Institute of Physics, U.K., chartered physicist of Institute of Physics, U.K., member of Institute of Electronic and Electrical Engineering, U.S., and member of American Physical Society. His research interest mainly lies in the area of defects in semiconductors, electrical and optical properties of semiconductors, carrier transport in semiconductors, semiconductor junctions, positron annihilation spectroscopy, and deep level transient spectroscopy. Up to now, he has published more than 100 journal papers, 60 conference papers, and 2 books.
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