Novel Self-Powered Photodetector with Binary Photoswitching Based on SnSx/TiO2 Heterojunctions

Jing Chen; Jianping Xu; Shaobo Shi; Rui Cao; Ding Liu; Yichen Bu; Pengcheng Yang; Jianghua Xu; Xiaosong Zhang; Lan Li

doi:10.1021/acsami.0c05247

Novel Self-Powered Photodetector with Binary Photoswitching Based on SnS_x/TiO₂ Heterojunctions

ACS Appl Mater Interfaces. 2020 May 20;12(20):23145-23154. doi: 10.1021/acsami.0c05247. Epub 2020 May 6.

Authors

Jing Chen¹, Jianping Xu², Shaobo Shi³, Rui Cao¹, Ding Liu¹, Yichen Bu¹, Pengcheng Yang¹, Jianghua Xu¹, Xiaosong Zhang¹, Lan Li¹

Affiliations

¹ School of Materials Science and Engineering, Institute of Material Physics, Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, and Tianjin Key Laboratory for Photoelectric Materials and Devices, Tianjin University of Technology, Tianjin 300384, China.
² School of Science, Tianjin University of Technology, Tianjin 300384, China.
³ School of Science, Tianjin University of Technology and Education, Tianjin 300222, China.

PMID: 32338868
DOI: 10.1021/acsami.0c05247

Abstract

Binary photoresponse characteristics can help realize optical signal processing and logic operations. UV photodetectors (PDs) with SnS_x nanoflakes and TiO₂ nanorod arrays (NRs) show a novel binary photoswitching behavior (change in current from positive to negative) by manipulating the light wavelength without an external power source, utilizing the interfacial recombination of the photogenerated carriers in the type-I SnS_x/TiO₂ heterojunctions. The enhanced responsivity (R*), detectivity (D^*), and fast photoresponse time for self-powered SnS_x/TiO₂PDs can be achieved by adjusting the phase ratio of SnS and SnS₂ nanoflakes. The binary photoswitching in the self-powered UV PDs can be applied in the encrypted optical signal processing and imaging in some special conditions without external bias.

Keywords: SnSx/TiO2; binary photoresponse; heterojunctions; self-powered photodetector.