High-performance self-powered photodetector based on Bi2O2Se nanosheets

2D layered material Bi 2 O 2 Se nanosheets, due to its high carrier mobility, near-ideal subthreshold swing, and high air-stability, which have shown great potential for applications in high-performance field-effect transistors and photodetector. Here, we have been successfully synthesized Bi 2 O 2 Se nanosheets via a facile one-step hydrothermal method. The Bi 2 O 2 Se nanosheets were characterized by scanning electron microscopy (SEM), Raman spectra and X-ray diffraction (XRD) patterns, which confirm an excellent crystallized of Bi 2 O 2 Se nanosheets. The as-prepared Bi 2 O 2 Se nanosheets were used to fabricate electrodes for a self-powered photodetector and exhibit preferable photoresponse activity. At 0 V, the photoeletrochemical (PEC) tests demonstrate that the responsivity and the response time of Bi 2 O 2 Se nanosheets can reach up to 20 μA W −1 and 0.12 s. Furthermore, the time stability and cycle stability also were measured. After a long time of testing, the photocurrent of Bi 2 O 2 Se nanosheets remained around 300 nA, and after processing 100 and 200 cycles, the photocurrent exhibits slight distinction. These findings indicate that Bi 2 O 2 Se nanosheets have great prospects for future applications in self-powered photodetector devices.