Full‐Inorganic Thin Film Solar Cell and Photodetector Based on “Graphene‐on‐Antimony Sulfide” Heterostructure (Solar RRL 12∕2017)

Graphene-on-semiconductor has been proved to be a quality heterojunction with efficient photoelectric conversion. Antimony sulfide (Sb2S3), a promising and readily available absorber material, is widely employed in low-cost and environmentally friendly solar cells. However, current Sb2S3 thin-film solar cells mostly use organic material as the hole-transporting layer and suffer from unsatisfactory stability. Herein (article No. 201700135), graphene is selected as a hole-transporting layer to construct novel planar graphene/Sb2S3 based fullinorganic thin film solar cell and visible-light photodetector. By modifying the surface of Sb2S3 to reduce surface defects and balancing the transparency and conductivity of graphene layers, the solar cell records an overall power conversion efficiency of 1.65% as well as an open circuit voltage of 0.665V under AM 1.5G illumination (100 mW cm−2). The device shows almost no degradation even after two months of ambient storage. Moreover, the device with high built-in electric field as photoanode is applied to detect the visible light without a power source. This self-powered light-photodetector exhibits good visible-light response, linear photocurrent characteristics, high stability, excellent reproducible properties and fast photoresponse.