Chemical bath deposition of Bi2S3 films by a novel deposition system

► Bi2S3 films were prepared by a novel chemical bath deposition system in which ammonium citrate was used as the chelating reagent. ► Two sulfur source (thioacetamide and sodium thiosulfate) were used to prepare Bi2S3 films for comparison. ► The structures, morphologies, optical properties and electrical properties of the Bi2S3 films were studied systematically.