Antimony　sulfide　(Sb2S3)　thin　film　was　prepared　by　a　simple　spin-coating　method　to　fabricate　Sb2S3　based　inorganic-organic　heterojunction　solar　cells.　Annealing　temperature　impact　on　the　optical　absorption　and　crystallization　of　Sb2S3　films　was　studied　systematically.　The　crystallinity　and　absorption　of　the　Sb2S3　film　improved　significantly　when　the　annealing　temperature　increased　from　200　degrees　C　to　300　degrees　C　leading　to　the　power　conversion　efficiency　of　Sb2S3-based　solar　cells　increased　from　0.02%　to　1.91%.　(C)　2019　Elsevier　B.V.　All　rights　reserved.