Photocurrent, Absorption and Electrochemical Impedance Analyses on Strontium Titanate Ferrate Films for Solar Energy Conversion
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Keywords

Solar cells
Perovskite
Water splitting
Solid solution
Solar energy conversion
Strontium titanate ferrate
Spray pyrolysis
renewable energy
UV-vis

Abstract

This article presents photon to electricity conversion analysis, and absorption and impedance measurements, on a new class of solid solutions, known as SrTi1-xFexO3-y or strontium titanate ferrate (STF). Incident photon-to-current efficiency (IPCE), UV-vis absorption spectroscopy and electrochemical impedance spectroscopy (EIS) were performed. The STF samples were prepared by employing spray pyrolysis approach on ITO substrates, at high temperature. A Varian Cary 50 Probe spectrometer was used for UV-vis measurements, and EIS results were obtained by using Z-plot software. In general, the proposed nanostructured STF films show good photoactivity properties giving high photocurrent response and with IPCEs of up to 11%. The samples show high absorption of UV-visible light in air, in the wavelength range 300 to 400 nm. The IPCE data suggest good photoelectrochemical activity, and the IPCE increases slightly with increase in the film thickness. Furthermore, the impedance is found to increase with increase in the applied potential and to decrease with the increase in film thickness.

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