May 21, 2020 10:00-11:00 (CST) Beijing
*Note: This webinar will be presented in Mandarin /中文
L) KPFM image of SnSe crystal surface. The color in the figure represents the measured surface potential value.
R) band alignment for SnSe and SnSe2 natural heterojunction.
Atomic force microscopy is an important tool in the research of surface topography and property, not only utilized in thin film, but also single crystal surface. Thermoelectric materials can generate electricity from waste heat, so it is environmental friendly. SnSe is a promising thermoelectric material with record-breaking figure of merit 2.6 at 923K, thus being widely used in prospect. However, the self-hole-doping mechanism in SnSe is still absent. Here we use AFM to study two kinds of defects in SnSe: SnSe2 micro domain and point dislocation. Then we provide an explanation for its self-hole-doping mechanism and electronic structure. This webinar consists of two parts: (1)Theory and operation of Kelvin probe force microscopy (2) Investigation of thermoelectric material SnSe using AFM.
Speaker：
Dr. Qifeng Hu
Qifeng Hu is currently a Ph.D. candidate in Prof. Yi Zheng in Zhejiang University. His research interests focus on 2D material multi-iron parts and electron transport. He has participated 3 SCI papers, and won the first prize of doctoral admission scholarship of 2011 collaborative innovation center.
