Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 17, Pages 6437-6445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja5015635
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Funding
- National Natural Science Foundation of China [91222201, J1103305]
- Program for New Century Excellent Talents in University [NCET-11-0533]
- NSF of Guangdong Province [S2013030013474]
- Fundamental Research Funds for the Central Universities
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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(-2); V-oc = 827 mV and FF = 0.72) was attained, which remarkably outperformed that of a TNP-based reference cell (eta = 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.
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