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 absorberReport as inadecuate




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 - Download this document for free, or read online. Document in PDF available to download.

Nanoscale Research Letters

, 9:605

First Online: 07 November 2014Received: 02 October 2014Accepted: 19 October 2014

Abstract

Cadmium sulfide CdS and silver sulfide Ag2S nanocrystals are deposited on the titanium dioxide TiO2 nanocrystalline film on indium tin oxide ITO substrate to prepare CdS-Ag2S-TiO2-ITO photoelectrodes through a new method known as the molecular precursor decomposition method. The Ag2S is interposed between the TiO2 nanocrystal film and CdS nanocrystals as an energy barrier layer and a light absorber. As a consequence, the energy conversion efficiency of the CdS-Ag2S-TiO2-ITO electrodes is significantly improved. Under AM 1.5 G sunlight irradiation, the maximum efficiency achieved for the CdS4-Ag2S-TiO2-ITO electrode is 3.46%, corresponding to an increase of about 150% as compared to the CdS4-TiO2-ITO electrode without the Ag2S layer. Our experimental results show that the improved efficiency is mainly due to the formation of Ag2S layer that may increase the light absorbance and reduce the recombination of photogenerated electrons with redox ions from the electrolyte.

KeywordsSilver sulfide nanocrystals Titanium dioxide Photoelectrodes Efficiency Recombination Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-9-605 contains supplementary material, which is available to authorized users.

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Author: Chong Chen - Yong Zhai - Chunxi Li - Fumin Li

Source: https://link.springer.com/







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