Environment friendly and non-toxic flexible Bi2O2S nanosheet photodetector based on deionized water solid electrolyte

Researchers are already becoming willing to get involved in bismuth oxysulfide (Bi2O2S), a new two-dimensional optoelectronic material with a lengthy carrier lifetime and a unique loose structure. In this work, the Bi2O2S nanosheets are produced by room temperature chemical synthesis and built a Bi2O2S nanosheets flexible photodetector based on deionized water solid-state electrolytes. Photoelectrochemical tests showed that the photodetector based on deionized water solid-state electrolyte had excellent photoresponse performance under 0 V, and its photocurrent density was 0.55 μA/cm2 when the optical power was 75 mW/cm2. In addition, the photodetector exhibited superb stability. After cycling the “on–off” behavior for 1000 s, the photocurrent slightly decreased 8% than initial state. At a bending angle of 30°, the photocurrent density was about 91% of the original state, but when the bending angle is 60°, the photocurrent density was about 76% of the original state, which may be caused by the small cracks formed during the bending process. The results showed that the flexible photodetector based on Bi2O2S nanosheets had decent stability and mechanical flexibility, and were safer and more environmentally friendly than traditional detectors, providing a workable option for the flexible photodetector’s construction.