LAUSR

Abstract By electrodeposition method, the nanostructured iron pyrite (FeS2) films were deposited on the FTO substrate. X-ray diffraction (XRD) analysis showed the formation of cubic pyrite (FeS2). Moreover, field emission scanning electron microscopy (FESEM) images showed that compared with the un-doped specimen, the morphology of the Sn-doped did not change in low concentrations of Sn, so that it sustained the cauliflower-like shape; however, in high concentrations of Sn, the morphology of the specimens changed. The photoluminescence (PL) spectra revealed the presence of emission bands in the green and red regions and the energy band gap of the specimens was ~1.63 eV. Optoelectronic measurements further showed that the films had p-type conductivity. Furthermore, photodetectors with FTO/TiO2/un-and-Sn-doped FeS2/Au configuration were fabricated. Compared with the un-doped specimen, the one doped with minimum Sn concentration displayed a significant response in the form of a 20-fold increase in the spectral range of visible light.