Abstract
Mono-dispersive TiO2 hollow spheres (THS) of 400, 500, 600, 750 and 950 nm in diameter are mixed into TiO2 nanoparticle films, respectively, as light scattering centers for optical absorption enhancement in dye-sensitized solar cells (DSSCs). The effect of THS diameter on light harvesting and photovoltaic performance of DSSCs has been investigated. At a THS content of 15% by weight, all the DSSCs with THS exhibit improved power conversion efficiency compared to that based on P25 TiO2 film. The conversion efficiency enhancement of the DSSCs is mainly attributed to the tradeoff between the enhanced light scattering effect and the loss of internal surface area, both of which are highly dependent on the diameter of THS. The DSSC based on 600 nm THS-embedded photoanode exhibits the highest conversion efficiency of 5.84%, which is 68.8% higher than that based on P25 TiO2 photoanode.
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