|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022
||Exciton Transport in Strained Two-dimensional Semiconductors
||Jin Myung Kim, Kwang-Yong Jeong, Jaepil So, Mike Cai Wang, Peter Snapp, Hong-Gyu Park, SungWoo Nam
|On-Site Speaker (Planned)
||Jin Myung Kim
Exciton in two-dimensional (2D) van der Waals semiconductors has emerged as a prospective component for integrated optoelectronic circuits and interconnects working at room temperature. Strain is a key parameter that can guide exciton transport by creating lateral gradient of exciton energy. However, demonstration of this phenomenon has mostly been limited to spectroscopic interpretation within diffusion-limited length scale. Here, we report strain-induced exciton transport in monolayer WSe2 via pump-probe photoluminescence (PL) measurement. We employed wrinkle architecture to engineer reconfigurable local strain and optically resolvable strain gradient on WSe2. The pump-probe PL maps revealed that strain gradient can induce flux of high-energy excitons to the nearest energy minima up to 2.9 μm-away from pump point with high transport efficiency (>40%). We proposed exciton dynamics model in relation to local strain and strain gradient on WSe2. Our results provide a platform for strain-engineered 2D materials for mechanically reconfigurable optoelectronic circuits and straintronic devices.