The XRD pattern of Sb2Se3 was indexed to the orthorhombic phase of Sb2Se3 (JCPDS 01-089-0821), and that of the sulfur-treated film was identical to the Sb2Se3 (Figure ), indicating that the bare Sb2Se3 crystal structure was not affected by the sulfurization treatment. It is also evident from the absorption spectrum, that the onset of absorption does not change significantly with sulfur treatment indicating that the incorporation of sulfur does not change the optical band gap (Figure ).