A dye-sensitized solar cell (DSC) made of nanoporous ZnO film on aluminum-doped zinc oxide (ZnO/AZO) transparent substrate has higher solar-to-electric energy conversion efficiency than a DSC consisting of nanoporous ZnO film deposited on conventional fluorine-doped tin oxide (ZnO/FTO) transparent substrate. The ZnO/AZO DSC gave an overall conversion efficiency of 7.2% whereas the ZnO/FTO yielded a conversion efficiency of 4.5%. The film-substrate orientation and higher light harvesting of the nanoporous ZnO film on the AZO after heating in air are mainly attributed to the higher energy conversion efficiency of the ZnO/AZO DSC. Copyright © 2012 John Wiley & Sons, Ltd.
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