Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 171, Issue 3, Pages 269-273Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2004.10.019
Keywords
flexible dye-sensitized solar cell; inherent energy barrier; ZnO layer; recombination
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A photoelectrode using ZnO coated TiO2 nanoparticles was prepared for use in flexible dye-sensitized solar cells. To provide an inherent energy barrier between the electrode and electrolyte interface, the surface of the TiO2 nanoparticles was modified by thin ZnO layer. X-ray photoelectron spectroscopy and transmission electron microscopy image confirmed the formation of ZnO with a thickness of ca. similar to 0.5 run, possible thickness for tunneling process in particle-to-particle transport of electrons, on the TiO2 surface. The overall conversion efficiency was increased from 0.71 to 1.21% under a light intensity of 20 mW/cm(2) (0.2 sun) due to the reduced recombination of photoinjected electrons without any post-treatment. (c) 2004 Elsevier B.V. All rights reserved.
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