Abstract
In this study, we explore the use of various ratios of TiO2 nanoparticle (NP)/nanowire (NW) composite films in back-illuminated dye-sensitized solar cells (DSSCs) based on cobalt redox couples. TiO2 NPs provided sufficient surface areas for dye adsorption and TiO2 NWs helped efficient charge transport in NP/NW composite film. Furthermore, incorporation of NWs in TiO2 film makes it more porous, relaxing the limited mass transport of cobalt redox ions. As a result, DSSCs with proper weight percentage of NW incorporated TiO2 NP/NW composite film showed a superior photovoltaic performance to DSSCs with pure TiO2 NPs film.
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