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Cadmium sulfide (CdS) and silver sulfide (Ag 2 S) nanocrystals are deposited on the titanium dioxide (TiO 2 ) nanocrystalline film on indium tin oxide (ITO) substrate to prepare CdS/Ag 2 S/TiO 2 /ITO photoelectrodes through a new method known as the molecular precursor decomposition method. The Ag 2 S is interposed between the TiO 2  nanocrystal film and CdS nanocrystals as an energy barrier layer and a light absorber. As a consequence, the energy conversion efficiency of the CdS/Ag 2 S/TiO 2 /ITO electrodes is significantly improved. Under AM 1.5 G sunlight irradiation, the maximum efficiency achieved for the CdS(4)/Ag 2 S/TiO 2 /ITO electrode is 3.46%, corresponding to an increase of about 150% as compared to the CdS(4)/TiO 2 /ITO electrode without the Ag 2 S layer. Our experimental results show that the improved efficiency is mainly due to the formation of Ag 2 S layer that may increase the light absorbance and reduce the recombination of photogenerated electrons with redox ions from the electrolyte.

nanoscale research letters

Improving the efficiency of cadmium sulfide-sensitized titanium dioxide/indium tin oxide glass photoelectrodes using silver sulfide as an energy barrier layer and a light absorber