Transient Photocurrent Responses of SrCeTiO Perovskites Under Visible Light Illumination for Photovoltaic Applications.

The objective of this study was to synthesize strontium titanate (SrCeTiO) doped with Ce by solid state method. Its crystalline structure is SrCeTiO, and its bandgap ranges from ~3.3 to ~2.7 eV. In the photoluminescence of samples excited at 288 nm, the maximum emission of blue light was observed at 380 and 390 nm. Photocatalytic results show that dye molecules have a high absorbance, whereas their surface area is large. According to a line sweep voltammetric plot (LSV), illumination increases the current density by 0.4 μA cm compared with dark conditions. It was demonstrated that the material changed from n-type to p-type under doping. Chronoamperometry spectra were obtained for sample SrCeTiO (x = 0, 0.005, 0.01, 0.03, 0.05) when an electrical voltage of 0.8 V was applied versus NHE. The plots indicate an increase in the current density under "light ON" conditions and a decrease under "light OFF" conditions. As Ce concentration increases, the photocurrent increases until about 3 mol%, after which it decreases abruptly.