Organic thin film thickness-dependent photocurrents polarity in graphene heterojunction phototransistor

被引:15
|
作者
He, Meiyu [1 ]
Han, Jiayue [1 ]
Han, Xingwei [1 ]
Gou, Jun [1 ,2 ]
Yang, Ming [1 ]
Wu, Zhiming [1 ,2 ]
Jiang, Yadong [1 ,2 ]
Wang, Jun [1 ,2 ]
机构
[1] Univ Elect Sci & Technol China, Sch Optoelect Sci & Engn, Chengdu 610054, Peoples R China
[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China
基金
中国国家自然科学基金;
关键词
Graphene; Phototransistors; Graphene/organic heterojunction; Bi-directional response; Fast speed; Thickness-dependent polarity; CHARGE-TRANSFER; QUANTUM DOTS; HYBRID; PERFORMANCE; HETEROSTRUCTURE; PHOTODETECTORS; GAIN;
D O I
10.1016/j.carbon.2021.03.024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
To overcome the weak absorption deficiency of 2D materials, combining bilayer/bulk heterojunction and 2D materials in a photoconductive framework facilitates the separation and transfer of photo-generated carriers for prominent performance photo-detector. Nevertheless, apart from improving the inferior built-in electric field, the multilayer device may suffer a low efficiency due to depletion loss considering the effective exciton length limitation. Here, we demonstrate the thickness-dependent photocurrent polarity based on a bilayer enhanced graphene/C-60/ZnPc phototransistor. A fast response time down to 7.29 ms and a responsivity of 6537 A/W are achieved in the device with the help of type-II band alignment and valid interfaces between organic layers. Moreover, three controlled thicknesses of intermediate charge transfer layer are investigated for the purpose of probing the transfer direction in multilayer heterojunction, which suggests that the photocurrent polarity is highly related to the thickness of C-60 and even input optical power density. Owing to the phenomena of photocurrents polarity, a distinct bending curve of responsivity-power density relation is observed near the positive-negative altering point compared to general logarithm linear relation in most photoconductive devices. Our results may enable further exploration of charge transfer mechanism in multilayer system and development of high speed photoconductive transistor. (C) 2021 Elsevier Ltd. All rights reserved.
引用
收藏
页码:506 / 514
页数:9
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