Photoelectrochemical Study of TiO2/CdS Heterostructure Thin Films Prepared via rf Sputtering
In the present investigation TiO2, CdS and TiO2/CdS heterostructure thin films have been deposited on the indium doped tin oxide substrates (In: SnO2; ITO) by rf magnetron sputtering technique. A further study has been made for structural, optical and photoelectrochemical (PEC) properties of TiO2, CdS and TiO2/CdS heterostructure system. PEC behaviour of TiO2/CdS heterostructure thin film was studied and compared with TiO2 and CdS pristine thin film photoelectrodes. Enhanced photocurrent density of 0.36 mA/cm2 was observed in TiO2/CdS heterostructure thin films as compared to pristine TiO2(0.18 mA/cm2) and CdS (35 μA/cm2) at an applied bias of 0.23 V versus Ag/AgCl in 0.5 M Na2SO4 (pH = 7) electrolyte. This work provides promising methods to enhance the PEC water oxidation performance of the TiO2-based heterostructure photoanodes.
N. K. is grateful to MHRD and Industrial Research (CSIR) for awarding junior research fellowship.