Novel tin disulfide/graphene photoelectrochemical photodetector based on solid-state electrolytes and its performances

Tin disulfide/graphene composites were successfully synthesized by one-step hydrothermal method. A novel SnS2/graphene solid-state photoelectrochemical photodetector with the advantages of small size, light weight, easy portability, and easy storage was successfully constructed based on solid-state electrolytes. The SnS2/graphene composites with pleated flower-like structure were characterized by scanning electron microscope characterization. At the same time, X-ray diffraction and Raman spectroscopy were carried out to confirm the composition and inherent physical properties of SnS2/graphene. Photoelectrochemical tests show that the SnS2/graphene solid-state photoelectrochemical photodetector has excellent photoresponse characteristics, and its photocurrent density is about 9 nA/cm2 under sunlight irradiation without additional power. In addition, the SnS2/graphene solid-state photoelectrochemical photodetector exhibits a good stability and the photocurrent density is only slightly attenuated (77% of the initial value) after 2000 s (50 cycles). Experimental results that SnS2/graphene solid-state photoelectrochemical photodetector is a potential new type self-powered photodetector. We believe that solid-state electrolytes with the advantages of small size, light weight, easy portability, and easy storage can be extended to other fields, such as solar cells, and supercapacitors.