Novel\nSelf-Powered Photodetector with Binary Photoswitching\nBased on SnS<sub><i>x</i></sub>/TiO<sub>2</sub> Heterojunctions
Jing Chen (4762)Jianping Xu (163726)Shaobo Shi (600703)Rui Cao (800989)Ding Liu (775091)Yichen Bu (8807801)Pengcheng Yang (104213)Jianghua Xu (8807804)Xiaosong Zhang (79777)Lan Li (73597)
Abstract
Binary photoresponse characteristics\ncan help realize optical signal processing and logic operations. UV\nphotodetectors (PDs) with SnS<sub><i>x</i></sub> nanoflakes\nand TiO<sub>2</sub> nanorod arrays (NRs) show a novel binary photoswitching\nbehavior (change in current from positive to negative) by manipulating\nthe light wavelength without an external power source, utilizing the\ninterfacial recombination of the photogenerated carriers in the type-I\nSnS<sub><i>x</i></sub>/TiO<sub>2</sub> heterojunctions.\nThe enhanced responsivity (<i>R*</i>), detectivity (<i>D<sup>*</sup></i>), and fast photoresponse time for self-powered\nSnS<sub><i>x</i></sub>/TiO<sub>2</sub>PDs can be achieved\nby adjusting the phase ratio of SnS and SnS<sub>2</sub> nanoflakes.\nThe binary photoswitching in the self-powered UV PDs can be applied\nin the encrypted optical signal processing and imaging in some special\nconditions without external bias.
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