Condensed Matter & Surface Sciences
Kent State University
“Shift Current in Two-Dimensional Ferroelectrics”
In recent years, it has become clear the need for efficiently harvesting solar energy. Unfortunately, silicon-based solar cells with high efficiency are very costly. These devices rely on pn-junctions to separate positive and negative charge carries. In this talk, I propose to explore a less known (but very interesting) non-linear optical effect, so-called `shift current’, to generate large photocurrent beyond the pn-junction paradigm. I will describe the shift-current mechanism in bulk ferroelectrics, in two-dimensional ferroelectrics and its relation to spontaneous electric polarization. Importantly, material candidates with large shift current will be studied which are promising for optoelectronic applications.
Thursday, December 7, 2017
4:10 p.m. -- Walter Lecture Hall 245