期刊
NANOSCALE
卷 5, 期 5, 页码 1894-1901出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr33599a
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资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials and Engineering [DE-FG02-07ER46467]
- National Science Foundation [DMR-1035196]
- National Natural Science Foundation of China [50873055]
- National Key Basic Research and Development Program of China [2009CB930602]
- China Scholarship Council (CSC)
In this paper, ZnO nanorod-nanosheet hierarchical structures were fabricated using a facile method on zinc foil and used as flexible photoanodes in dye-sensitized solar cells (DSCs). Compared to nanorods (NRs) obtained by the dissolution-precipitation method, the nanorod-nanosheet (NR-NS) hierarchical structures obtained by a second-step homogeneous precipitation improved the performance of DSCs by increasing photocurrent density significantly. As a result, the power conversion efficiency of the devices based on such a NR-NS hierarchical structure reached up to 2.4% under 100 mW cm(-2) illumination condition. This represents an enhancement by 108% as compared to DSCs based on NR assembled nanoflowers, for which the efficiency was 1.1%. The enhancement of the photocurrent was due mainly to the much larger specific surface area and resulting dye-loading amount. The electron transport properties in this structure were also investigated by means of electrochemical impedance spectroscopy (EIS). Furthermore, the formation mechanism of the NR-NS hierarchical structures are discussed.
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