Photoelectrochemically deposited Sb2Se3 thin films: deposition mechanism and characterization

Abstract

Sb₂Se₃ thin films were photoelectrochemically deposited (PED) and displayed a compelling photoelectrochemical (PEC) performance. The main influence of the illumination mechanism on Sb₂Se₃ deposition is that the photoconductive effect accelerates the deposition rate and the photogenerated electrons (in the conduction band of the deposited Sb₂Se₃ thin film) promote the electroreduction of SbO⁺. Electrochemical impedance spectroscopy (EIS) and potentiostatic polarization show evidence that illumination can promote the rate of cathodic reduction. Linear sweep photovoltammetry (LSPV) and X-ray fluorescence spectrometry (XRF) indicate that illumination facilitates the reduction of SbO⁺. The PED process can improve the homogeneity and compactness of the films, facilitate the growth of stoichiometric Sb₂Se₃ and further enhance the photocurrent response of films, compared to the conventional electrochemical deposition (CED) process.