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Issue 6, 2009
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Efficient electron transport in tetrapod-like ZnO metal-free dye-sensitized solar cells

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Abstract

The tetrapod-like ZnO nanopowders are employed to construct an efficient electron transport network as the photoanode of the dye-sensitized solar cells (DSCs). Due to the high extinction coefficient of the metal-free D149 dye offering a high photocurrent through the ZnO network, the best performance of DSCs based on a 42 µm terapod-like ZnO film showed a high energy conversion efficiency of 4.9% with a high short-circuit photocurrent density of 12.3 mA cm−2, an open-circuit photovoltage of 0.6 V, and a fill factor of 0.65 under AM 1.5 irradiation. Highly efficient electron transport may also be ascribed by a long effective electron diffusion length of 46 µm determined from the electrochemical impedance spectroscopy which is consistent with thickness dependent JSC measurements.

Graphical abstract: Efficient electron transport in tetrapod-like ZnO metal-free dye-sensitized solar cells

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Publication details

The article was received on 06 Feb 2009, accepted on 10 Mar 2009 and first published on 25 Mar 2009


Article type: Paper
DOI: 10.1039/B902595M
Citation: Energy Environ. Sci., 2009,2, 694-698
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    Efficient electron transport in tetrapod-like ZnO metal-free dye-sensitized solar cells

    W. Chiu, C. Lee, H. Cheng, H. Lin, S. Liao, J. Wu and W. Hsieh, Energy Environ. Sci., 2009, 2, 694
    DOI: 10.1039/B902595M

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