A flexible electrorde utilizing TiO 2 nanotubes (T_NT) anodically grown on titanium mesh with TiO 2 nanoparticles as an overlying layer for solar cell applications has been investigated. Deposition of cadmium sulfide nanocrystals (CdS) for visible light absorption was carried out through successive ionic layer adsorption and reaction (SILAR) method. The addition of a TiO 2 nanoparticle layer (T_NT/T_NP) prepared via TiCl 4 exposure and subsequent heat treatment on T_NT before CdS deposition was found to increase the deposition and utilization of CdS for the same number of SILAR cycles as compared to without TiO 2 nanoparticles. The increased loading of CdS, as a result of T_NP deposition, enhanced visible light absorbance as well as the photoelectrochemical properties. Spectroscopic and photoelectrochemical studies indicate that the T_NP assisted improved dispersion of CdS results in at least 2-times higher photocurrent than did the T_NT/CdS system. Preliminary tests demonstrate the stable performance of the T_NT/T_NP/CdS photoanode in a prototype solar cell configuration.
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Smith et al. (2011) studied this question.
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