1. Self-powered SnSx/TiO2 photodetectors (PDs) with dual-band binary response and the applications in imaging and light-encrypted logic gates.
- Author
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Chen, Jing, Xu, Jianping, Kong, Lina, Shi, Shaobo, Xu, Jianghua, Gao, Songyao, Zhang, Xiaosong, and Li, Lan
- Subjects
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LOGIC circuits , *PHOTODETECTORS , *TITANIUM dioxide , *POTENTIAL barrier , *ENERGY bands , *OPTICAL communications , *FERMI level - Abstract
[Display omitted] In this work, we report the design and fabrication of self-powered binary response PDs based on II-type heterostructures consisting of SnS x nanoflakes (NFs) and rutile TiO 2 nanorod arrays (NRs). The TiO 2 NRs effectively block light with wavelengths below 400 nm from reaching SnS x. Under 385 nm light, the photoelectrons in TiO 2 recombine with holes in SnS x at the interface due to the energy band bending, resulting in a positive photocurrent. Under 410 nm light, the photoelectrons in SnS x and the photogenerated holes in TiO 2 accumulate at the interface, overcoming the interfacial potential barriers induced by the higher Fermi levels of SnS x and inducing a negative photocurrent. Based on the bipolar response, the dual-band imaging capability without external filters and the light-encrypted OR, AND, and NOT logic gates using a single device are demonstrated. This work provides a blueprint for the development of multifunctional self-powered PDs that can simplify system architecture, reduce the energy consumption, and improve accuracy for applications, such as visual systems, light-controlled logic circuits, and encrypted optical communications. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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