Multistack Integration of Three-Dimensional Hyperbranched Anatase Titania Architectures for High-Efficiency Dye-Sensitized Solar Cells

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• 作者：Wu-Qiang Wu ; Yang-Fan Xu ; Hua-Shang Rao ; Cheng-Yong Su ; Dai-Bin Kuang
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：April 30, 2014
• 年：2014
• 卷：136
• 期：17
• 页码：6437-6445
• 全文大小：489K
• 年卷期：v.136,no.17(April 30, 2014)
• ISSN：1520-5126

文摘

An unprecedented attempt was conducted on suitably functionalized integration of three-dimensional hyperbranched titania architectures for efficient multistack photoanode, constructed via layer-by-layer assembly of hyperbranched hierarchical tree-like titania nanowires (underlayer), branched hierarchical rambutan-like titania hollow submicrometer-sized spheres (intermediate layer), and hyperbranched hierarchical urchin-like titania micrometer-sized spheres (top layer). Owing to favorable charge-collection, superior light harvesting efficiency and extended electron lifetime, the multilayered TiO₂-based devices showed greater J_sc and V_oc than those of a conventional TiO₂ nanoparticle (TNP), and an overall power conversion efficiency of 11.01% (J_sc = 18.53 mA cm^鈥?; V_oc = 827 mV and FF = 0.72) was attained, which remarkably outperformed that of a TNP-based reference cell (畏 = 7.62%) with a similar film thickness. Meanwhile, the facile and operable film-fabricating technique (hydrothermal and drop-casting) provides a promising scheme and great simplicity for high performance/cost ratio photovoltaic device processability in a sustainable way.