Hydrothermal synthesis and photoelectrochemical properties of In2S3 thin films with a wedgelike structure

► Wedgelike In2S3 films are synthesized on FTO substrate via a hydrothermal method. ► Facile control the morphology and thickness of the films. ► Tartaric acid play key role in the formation of In2S3 films. ► The wedgelike In2S3 thin films exhibit higher photocurrent than previous reports.