Tripartite Layered Photoanode from Hierarchical Anatase TiO2 Urchin-Like Spheres and P25: A Candidate for Enhanced Efficiency Dye Sensitized Solar Cells

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• 作者：Pengfei Cheng ; Sisi Du ; Yaxin Cai ; Fengmin Liu ; Peng Sun ; Jie Zheng ; Geyu Lu
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：November 21, 2013
• 年：2013
• 卷：117
• 期：46
• 页码：24150-24156
• 全文大小：459K
• 年卷期：v.117,no.46(November 21, 2013)
• ISSN：1932-7455

文摘

A trilaminar layer photoanode for dye-sensitized solar cells (DSSCs) was constructed using urchin-like TiO₂ hierarchical microspheres and P25. The top layer made of hierarchical microspheres enhanced light scattering; the middle layer consisting of P25 and as-prepared microspheres is a multifunctional layer for DSSCs, high adsorption ability to the dye, light scattering ability, and slow recombination rates coexistence; the bottom layer used P25. The DSSCs based on the photoanode with tripartite-layers structure exhibited a much higher short-circuit photocurrent density of 18.97 mA cm^鈥? and energy conversion efficiency of 8.80%, which indicated a 36% increase in the conversion efficiency compared to those of the P25 electrode (14.51 mA cm^鈥?, 6.50%). The great improvements of photocurrent density and energy conversion efficiency for hierarchical TiO₂ microspheres were mainly attributed to a considerable surface area, a higher light scattering ability, and slower electron recombination rates for the former.