|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022
||Strain-tunable Optoelectronic Response of Crumpled Graphene/Organic Semiconductor Heterostructure
||Zhichao Zhang, Jin Myung Kim, Sungwoo Nam
|On-Site Speaker (Planned)
Graphene-organic semiconductor heterostructure has drawn attentions in past decade due to the combined advantages from graphene and organic semiconductor, including strong light absorption, high sensitivity, and fast response time. Despite extensive studies thus far, the effects of mechanical strain on the optoelectronic properties of graphene-organic heterostructures remain unexplored. In this work, we report a strain-tunable photodetector prepared by crumpling an ultrathin film of graphene/organic conjugated polymer (PDPP2T-TT-OD) layers on an elastomeric substrate. The crumple structure enabled the film to be stretched up to 300% and exhibited three-fold enhancement in photoresponsivity (10^4 A/W ) compared with a flat heterostructure, attributed to enhanced scattering and reflection of incident light. We also found that strain directions significantly affect the optoelectronic performance of the heterostructure due to modulation of absorptions and charge accumulations in different directions. This work provides a new perspective of strain engineering of graphene-organic semiconductor heterostructures and flexible optoelectronics.
||Thin Films and Interfaces, Mechanical Properties, Polymers