Sn super(4+)-doped FeS sub(2) cubes with high yield thin films have been successfully synthesized on FTO glass through a simple hydrothermal process. The Sn super(4+)-doped FeS sub(2) cubes are single crystalline in cubic structure with (2 0 0) facet as the main exposed surface. The formation process was investigated. Sn super(2+) was found to play an important role during the formation process of FeS sub(2) growing on FTO glass. The direct optical band gap value can be estimated to be 1.71 eV which is much larger than that of bulk FeS sub(2) due to the Sn super(4+) doping. The photoelectrochemical properties of the Sn super(4+)-doped FeS sub(2) films were studied as well. There is a significant increase in photocurrent of Sn super(4+)-doped FeS sub(2) electrode compared to that of undoped sample.