As shown in Figure , the crystal structures of undoped and Sn-doped Sb2Se3 films were examined by XRD. The observed diffraction peaks of all as-prepared Sb2Se3 films well matched with the standard PDF card (JCPDS 15-0861) of orthorhombic Sb2Se3, confirming the absence of secondary phase formation even at higher Sn 2+ doping concentrations. Notably, the (020)