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Novel Self-Powered Photodetector with Binary Photoswitching Based on SnS/TiO2 Heterojunctions
Jing Chen1, Jianping Xu2, Shaobo Shi3
1School 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.
Abstract:
Binary photoresponse characteristics can help realize optical signal processing and logic operations. UV photodetectors (PDs) with SnS 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/TiO2 heterojunctions. The enhanced responsivity (R*), detectivity (D), and fast photoresponse time for self-powered SnS/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.
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