The new era of Internet of Things has spawned the research in multifunctional photodetectors. Herein, intriguing features of dual-polarity and flexibility are creatively embraced in Sb2Se3/ZnO bilayer photodetectors. The current...
despite the advantages of being without outer energy, most self-powered photodetectors suffer from low photoresponsivity, hindering their commercial applications. Even with recent progresses, for those devices with relatively high responsivity, the slow response time remains another challenge. [14] Therefore, constructing a self-powered broadband photodetector with high responsivity and fast response time is of great importance.Antimony triselenide (Sb 2 Se 3 ), with advantages of suitable bandgap, [15] high absorption coefficient, excellent electronic properties, low toxicity, low cost, and relatively earth-abundant constituents, [16] has attracted great research attention for solar cells and photodetectors. [17][18][19] Vanadium oxides, especially VO 2 , are typical materials with strong electron correlations and metal-insulator transitions, which are promising for smart windows, optic switches, memories, etc. [20][21][22][23][24][25][26][27] In this study, we fabricated a bilayer film of Sb 2 Se 3 and VO 2 on a sapphire substrate, forming a heterojunction photodetector. Despite its simple structure, the photodetector shows a superhigh responsivity of 0.244 A W −1 without any outer bias and fast response speeds of 200 µs for rise and 360 µs for decay. It should be emphasized that our self-powered photodetectors possess both high responsivity and fast response speed simultaneously. Great prospect for commercial applications can be imagined on this bilayer device.
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