期刊
CRYSTENGCOMM
卷 14, 期 23, 页码 7934-7941出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce25356a
关键词
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资金
- National Natural Science Foundation of China [61176004, 61204078]
- Basic and Frontier Research Programs of Henan Provence [092300410240, 112300410094]
- Natural Science Foundation of Education Department of Henan Province [2010 B150012, 2011A150017]
A hierarchical ZnO structure assembled by nanosheets was prepared through a low temperature chemical bath deposition and a growing-melting mechanism was proposed to elucidate the shape evolution. Afterwards, a poly (vinylpyrrolidone) (PVP) assisted hydrothermal method was adopted to decorate TiO2 particles onto the ZnO structure. When used in dye-sensitized solar cells, the device employing the hybrid ZnO/TiO2 photoanode exhibited improved short-circuit current density (J(sc)), open-circuit voltage (V-oc) and filling factor (FF), which resulted in a higher power conversion efficiency (PCE) of 3.60% in comparison to 1.96% from the pure ZnO cell. Based on the investigation of UV-vis absorption and diffuse-reflection spectra, Mott-Schottky analysis, electronic impedance spectra (EIS) and incident monochromatic photo-to-electron conversion efficiency (IPCE), the effect of TiO2 modification on the photovoltage performances of the ZnO sheet-based hierarchical structures was studied in detail.
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