Abstract
Herein, SnO2 spherical structure was directly deposited on FTO substrate by hydrothermal synthesis. As light absorber, CdS and CdSe nanoparticles were assembled onto the TiCl4-treated SnO2 spherical particles (SnO2(TiO2)) films by using SILAR method. The number of CdS and CdSe deposition cycles that influence the optical and photoelectrochemical performance of the photoelectrodes are evaluated. The best-performed sample is the co-deposition of 5 cycles of CdS and 4 cycles of CdSe on SnO2(TiO2) photoelectrode, and its photocurrent density is about 2.61 mA cm−2 versus Ag/AgCl at 0 V. The significant photoelectrochemical performance is due to a synergistic contribution from the enhanced light absorption range of the hybrid nanocomposite and the formation of type-II heterostructure, which plays important role in the effective charge separation process. Our results show that CdS/CdSe co-deposition SnO2(TiO2) photoelectrode may have great potential application in photovoltaic field.
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