Flexible, self-powered Bi2O2Se/Graphene photoeletrochemical photodetector based on solid-state electrolytes

Abstract

Flexible photodetectors have attracted great attention in fields such as display screens, aerospace, and civil engineering due to their wearable and large-area foldable advantages. Therefore, the hybrid structure of Bismuth oxyselenide(Bi2O2Se)/Graphene was successfully synthesized in this work through mechanical compound method. In addition, we constructed a photodetector based on solid-state electrolyte, which has the advantage of small size, light weight, and portability. Photoelectrochemical tests show that the Bi2O2Se/graphene photodetector based on solid-state electrolyte has excellent photoresponse characteristics under 0 V, and its photocurrent density is 400 nA/cm2 when the optical power is 120 mW/cm2. In addition, the Bi2O2Se/graphene photodetector exhibits superb flexibility. After different bending angles and bending times, the photocurrent slightly decreases, which may be due to small cracks in the bending process. Finally, the tested Bi2O2Se/graphene solid-state photodetector showed excellent stability. The photocurrent was only slightly reduced after 1000 s, which was 81% of the original value. The result shows that the hybrid structure of Bi2O2Se/Graphene has potential in the field of photodetectors with exceptional performance, excellent stability and mechanical properties.