Hanhong Chen et al 2008 Semicond. Sci. Technol. 23 045004 doi:10.1088/0268-1242/23/4/045004
Hanhong Chen1, Aurelien Du Pasquier2, Gaurav Saraf1, Jian Zhong1 and Yicheng Lu1
Show affiliationsGa-doped ZnO (GZO) transparent conducting films and well-aligned ZnO nanotips were sequentially grown on a glass substrate using metal–organic chemical vapor deposition (MOCVD). The morphology control of ZnO from dense films to nanotips was realized through temperature-modulated growth. The ZnO nanotips/GZO structure was sensitized with dye N719 to form photoelectrochemical cells. It is found that the power conversion efficiency linearly increases with the length of ZnO nanotips. For the 1.0 cm2 dye-sensitized solar cell built from 4.8 µm ZnO nanotips, a peak incident photo-to-current conversion efficiency of 79% (at ~530 nm) and a power conversion efficiency of 0.77% under the illumination of one sun-simulated sunlight were achieved. UV light harvesting directly by ZnO was observed. The I–V characteristics of the cells were analyzed using a one-diode equivalent circuit model.
84.60.Jt Photoelectric conversion: solar cells and arrays
84.60.Bk Performance characteristics of energy conversion systems; figure of merit
68.55.-a Thin film structure and morphology
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, etc.)
Issue 4 (April 2008)
Received 17 August 2007, in final form 23 January 2008
Published 26 February 2008
Hanhong Chen et al 2008 Semicond. Sci. Technol. 23 045004
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