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Issue 41, 2009
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Zinc-doping in TiO2 films to enhance electron transport in dye-sensitized solar cells under low-intensity illumination

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Abstract

A nanocrystalline TiO2 film with highly dispersed Zn-doping shows its capability for efficient electron transport in dye-sensitized solar cells (DSSCs). The Zn-doping is conducted viaZn2+ introduction into a layered titanate followed by hydrothermal treatment and calcination. The Zn-doped films exhibit an elevated electron Fermi level, which may enhance band bending to lower the density of empty trap states. Because of this Zn-doping, the consequent DSSCs can alleviate the decay of light-to-electric energy conversion efficiency due to light intensity reduction. Intensity-modulated spectroscopic analysis reveals that enhanced transport of photogenerated electrons as a result of the trap density minimization is responsible for the high cell performance under low-intensity illumination. A Zn-doping content of ca. 0.4 at% Zn/Ti can enhance the light conversion efficiency by 23% at a solar light intensity as low as 11 mW cm−2. This technique can significantly extend the indoor application of DSSCs.

Graphical abstract: Zinc-doping in TiO2 films to enhance electron transport in dye-sensitized solar cells under low-intensity illumination

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Publication details

The article was received on 26 Jun 2009, accepted on 28 Jul 2009 and first published on 18 Aug 2009


Article type: Paper
DOI: 10.1039/B912672D
Citation: Phys. Chem. Chem. Phys., 2009,11, 9489-9496
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    Zinc-doping in TiO2 films to enhance electron transport in dye-sensitized solar cells under low-intensity illumination

    K. Wang and H. Teng, Phys. Chem. Chem. Phys., 2009, 11, 9489
    DOI: 10.1039/B912672D

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