Significantly Enhanced Photoresponse of Self-Powered 2D MoS2/WS2 Heterojunction Photodiode via F4-TCNQ Doping

被引:1
作者
Yang, Shuqi [1 ]
Wu, Zhangting [1 ]
Wang, Shuailong [1 ]
Zheng, Peng [1 ]
Zhang, Yang [1 ]
机构
[1] Hangzhou Dianzi Univ, Dept Elect Sci & Technol, Lab Nanoelect & NanoDevices, Hangzhou 310018, Peoples R China
基金
中国国家自然科学基金;
关键词
MoS2; WS2; photodiode; self-powered; doping; DRIVEN PHOTODETECTOR; HIGH-DETECTIVITY; HETEROSTRUCTURE; PHOTOTRANSISTORS; GROWTH; ENERGY; WS2;
D O I
10.1021/acsaelm.4c00192
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The formation of two-dimensional (2D) van der Waals heterojunctions offers opportunities to design micro- and nanoscale photodiodes. However, the strong carrier recombination induced by defect states in 2D materials leads to a low photoresponsivity of photodiodes. To achieve photodetectors with high responsivity and sensitivity, we designed a 2D semivertical MoS2/WS2 heterojunction photodiode with a single depletion region. A broadband response from 532 to 785 nm in self-powered mode was demonstrated for the photodiode. To further enhance the self-powered photodetection performance of the photodiode, we chose to dope the heterojunction with F-4-TCNQ molecules and found that the device performance was significantly improved. The doping-induced depletion region facilitates the separation of photogenerated electron-hole pairs in the heterojunction. The sensitivity improvements at 532, 635, and 785 nm were more than 1110%, 278%, and 492%, respectively. The self-powered photodiode achieved high sensitivity, with a maximum responsivity of 0.288 A/W and a maximum detectivity of 1.04 x 10(11) Jones after doping. The rise and fall times of the doped photodiode were extremely fast, with values of 11/19 mu s. This research work provides a viable solution for achieving high-performance and broadband 2D photodetectors.
引用
收藏
页码:3374 / 3384
页数:11
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