December 1, 2017 at 10:30 pm

CMSS Colloquium | Shift Current in Two-Dimensional Ferroelectrics, Dec. 7

The Condensed Matter & Surface Sciences Colloquium Series presents Benjamin Fregoso of Kent State University on “Shift Current in Two-Dimensional Ferroelectrics”,  on Thursday, Dec. 7, at 4:10 p.m. in Walter 245.

Benjamin Fregoso

Benjamin Fregoso

Abstract: 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.

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