Activation of the Photosensitive Potential of 2D GaSe by Interfacial EngineeringClick to copy article linkArticle link copied!
- Liang YuLiang YuGuangdong Provincial Key Laboratory of Information Photonics Technology, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, P. R. ChinaSchool of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. ChinaMore by Liang Yu
- Xinyue LiuXinyue LiuGuangdong Provincial Key Laboratory of Nanophotonic Manipulation, Institute of Nanophotonics, Jinan University, Guangzhou 511443, P. R. ChinaMore by Xinyue Liu
- Meifei ChenMeifei ChenGuangdong Provincial Key Laboratory of Information Photonics Technology, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, P. R. ChinaMore by Meifei Chen
- Junhao PengJunhao PengSchool of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. ChinaMore by Junhao Peng
- Ting XuTing XuSchool of Material Science & Engineering, Shaanxi University of Science & Technology, Xi’an 710021, P. R. ChinaMore by Ting Xu
- Wei GaoWei GaoSchool of Semiconductor Science and Technology, South China Normal University, Foshan 528225, Guangdong, P.R. ChinaMore by Wei Gao
- Mengmeng YangMengmeng YangSchool of Semiconductor Science and Technology, South China Normal University, Foshan 528225, Guangdong, P.R. ChinaMore by Mengmeng Yang
- Chun DuChun DuGuangdong Provincial Key Laboratory of Optical Fiber Sensing and Communication, Institute of Photonics Technology, Jinan University, Guangzhou 510632, P. R. ChinaMore by Chun Du
- Jiandong YaoJiandong YaoState Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, School of Materials Science & Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, P. R. ChinaMore by Jiandong Yao
- Wei Song*Wei Song*W.S.: email, [email protected]Analysis and Test Center, Guangdong University of Technology, Guangzhou 510006, Guangdong, P. R. ChinaMore by Wei Song
- Huafeng Dong*Huafeng Dong*H.D: email, [email protected]School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. ChinaMore by Huafeng Dong
- Jingbo LiJingbo LiCollege of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, P. R. ChinaMore by Jingbo Li
- Zhaoqiang Zheng*Zhaoqiang Zheng*Z.Z.: email, [email protected]Guangdong Provincial Key Laboratory of Information Photonics Technology, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, P. R. ChinaMore by Zhaoqiang Zheng
Abstract
![Abstract Image](/cms/10.1021/acsami.4c03191/asset/images/medium/am4c03191_0007.gif)
Two-dimensional (2D) gallium selenide (GaSe) holds great promise for pioneering advancements in photodetection due to its exceptional electronic and optoelectronic properties. However, in conventional photodetectors, 2D GaSe only functions as a photosensitive layer, failing to fully exploit its inherent photosensitive potential. Herein, we propose an ultrasensitive photodetector based on out-of-plane 2D GaSe/MoSe2 heterostructure. Through interfacial engineering, 2D GaSe serves not only as the photosensitive layer but also as the photoconductive gain and passivation layer, introducing a photogating effect and extending the lifetime of photocarriers. Capitalizing on these features, the device exhibits exceptional photodetection performance, including a responsivity of 28 800 A/W, specific detectivity of 7.1 × 1014 Jones, light on/off ratio of 1.2 × 106, and rise/fall time of 112.4/426.8 μs. Moreover, high-resolution imaging under various wavelengths is successfully demonstrated using this device. Additionally, we showcase the generality of this device design by activating the photosensitive potential of 2D GaSe with other transition metal dichalcogenides (TMDCs) such as WSe2, WS2, and MoS2. This work provides inspiration for future development in high-performance photodetectors, shining a spotlight on the potential of 2D GaSe and its heterostructure.
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