Graphene/GaSe-Nanosheet Hybrid: Towards High Gain and Fast Photoresponse

Scientific Reports
Rongtao LuJudy Z Wu

Abstract

While high photoconductive gain has been recently achieved in graphene-based hybrid phototransistors using semiconductor two-dimensional transition/post-transition metal dichalcogenides or quantum dots sensitizers, obtaining fast photoresponse simutaneously remains a challenge that must be addressed for practical applications. In this paper we report a graphene/GaSe nanosheets hybrid photodetector, in which GaSe nanosheets provide a favorable geometric link to graphene conductive layer through van Der Waals force. After a vacuum annealing process, a high gain in exceeding 10(7) has been obtained simitaneously with a dynamic response time of around 10 ms for both light on and off. We attribute the high performance to the elimination of possible deep charge traps, most probably at the graphene/GaSe nanosheets interface. This result demonstrates high photoconductive gain and fast photoresponse can be achieved simultaneously and a clean interface is the key to the high performance of these hybrid devices.

References

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Citations

Apr 12, 2017·Nanoscale Research Letters·Jinyang LiuLimei Lin
Jul 12, 2017·Chemical Society Reviews·Pablo Solís-FernándezHiroki Ago
Mar 16, 2017·Nanotechnology·Daniel Andres-PenaresJuan F Sánchez-Royo
Jul 10, 2019·Advanced Materials·Xiaoqing ChenXinran Wang
Aug 2, 2020·Scientific Reports·Cheng-Wei LiuHuy-Hoang Luc
Sep 19, 2017·ACS Applied Materials & Interfaces·Guangliang HuJudy Wu
Sep 28, 2018·ACS Applied Nano Materials·Wonjae KimMika Prunnila

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Methods Mentioned

BETA
transmission electron microscopy
X-ray

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