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Electron transport in back contact dye-sensitized solar cells

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7 Author(s)
Fuke, Nobuhiro ; Advanced Energy Technology Laboratories, Sharp Corporation, 282-1 Hajikami, Katsuragi-shi, Nara 639-2198, Japan ; Fukui, Atsushi ; Islam, A. ; Komiya, Ryoichi
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The electron transport properties of a back contact dye-sensitized solar cell (BCDSC) were investigated in comparison with a conventional DSC. It was found that the BCDSC had a lower short circuit current density (JSC) at the same thickness of TiO2 film and that JSC was not proportional to the thickness of the TiO2 film. Calculation of electron transport length in the TiO2 film suggested that the injected electron travels a longer distance to the electrode in the BCDSC than in the DSC. TiCl4 treatment of the TiO2 film produced a marked improvement of the JSC value in the BCDSC due to an increase in the electron diffusion coefficient of the TiO2 film, whereas the JSC of the DSC remained almost unchanged. It is clear that the value of JSC in the BCDSC is more dependent on the electron transport properties of the TiO2 film than in the DSC. Under standard AM 1.5 irradiation (100 mWcm-2), a BCDSC with N719 dye yielded an overall conversion efficiency of 8.0%.

Published in:

Journal of Applied Physics  (Volume:104 ,  Issue: 6 )