High-performance self-powered photodetector based on Bi2O2Se nanosheets

Abstract

2D layered material Bi2O2Se 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 Bi2O2Se nanosheets via a facile one-step hydrothermal method. The Bi2O2Se nanosheets were characterized by scanning electron microscopy (SEM), Raman spectra and X-ray diffraction (XRD) patterns, which confirm an excellent crystallized of Bi2O2Se nanosheets. The as-prepared Bi2O2Se 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 Bi2O2Se 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 Bi2O2Se nanosheets remained around 300 nA, and after processing 100 and 200 cycles, the photocurrent exhibits slight distinction. These findings indicate that Bi2O2Se nanosheets have great prospects for future applications in self-powered photodetector devices.