High‐Performance, Self‐Driven Photodetector Based on Graphene Sandwiched GaSe/WS 2 Heterojunction

Restacking the exfoliated 2D layered materials into complex heterostructures with new functionality has opened a new platform for materials engineering and device application. In this work, graphene sandwiched p‐GaSe/n‐WS 2 vertical heterostructures are fabricated for photodetection. The devices sho...

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Bibliographic Details
Published in:Advanced optical materials 2018-01, Vol.6 (2)
Main Authors: Lv, Quanshan, Yan, Faguang, Wei, Xia, Wang, Kaiyou
Format: Article
Language:English
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Summary:Restacking the exfoliated 2D layered materials into complex heterostructures with new functionality has opened a new platform for materials engineering and device application. In this work, graphene sandwiched p‐GaSe/n‐WS 2 vertical heterostructures are fabricated for photodetection. The devices show excellent performance on photodetection from ultraviolet to visible wavelength range, including high photoresponsivity (≈149 A W −1 at 410 nm), short response time of 37 µs, and self‐powered photodetection. The scanning photocurrent microscopy is also employed to investigate the photocurrent generation in the heterojunction and a significant enhancement of the photoresponse is found in the overlapping region. The results suggest that the graphene sandwiched vertical heterojunctions are promising in future novel optoelectronic devices applications.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.201700490