Positive and negative photoconductivity characteristics in CsPbBr3/graphene heterojunction

Haonan Jin; Yibo Chen; Louwen Zhang; Rui Wan; Zhengguang Zou; Haixia Li; Yihua Gao

doi:10.1088/1361-6528/abc850

Positive and negative photoconductivity characteristics in CsPbBr₃/graphene heterojunction

Nanotechnology. 2021 Feb 19;32(8):085202. doi: 10.1088/1361-6528/abc850.

Authors

Haonan Jin¹, Yibo Chen¹, Louwen Zhang¹, Rui Wan¹, Zhengguang Zou², Haixia Li³, Yihua Gao^{1

2

3}

Affiliations

¹ Center for Nanoscale Characterization & Devices (CNCD), School of Physics & Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China.
² College of Materials Science and Engineering, Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin 541004, People's Republic of China.
³ Hubei Key Laboratory of Optical Information and Pattern Recognition School of Mathematics and Physics, Wuhan Institute of Technology, Wuhan 430205, People's Republic of China.

PMID: 33157541
DOI: 10.1088/1361-6528/abc850

Abstract

Broadband response photodetectors have received great research interest in optical sensing field. Usually, materials with positive photoconductivity (PPC) are general and the lack of negative photoconductivity (NPC) materials limits the application of photoelectric effect, especially in the broadband photodetecting field. Therefore, the finding of NPC materials is very important. Integrating PPC and NPC response into a single device is extremely meaningful to the development of broadband photodetector. In this work, we fabricated CsPbBr₃ nanocrystals (NCs)-multilayered graphene heterojunction, which achieved persistent NPC response to ultra violet (300-390 nm) and PPC response to visible light (420-510 nm). The persistent NPC relies on the desorption of H₂O vapor, and varies its intensity with the power intensity of laser. The PPC relies on the holes transmission from NCs to graphene. The recombination of NPC and PPC effect provides background knowledge for the development of broadband photodetector.