Recombination and Transport Processes in Dye-Sensitized Solar Cells Investigated under Working Conditions

Jarl Nissfolk, Kristofer Fredin, Anders Hagfeldt, and Gerrit Boschloo*
Center of Molecular Devices, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30, 100 44 Stockholm, Sweden
J. Phys. Chem. B, 2006, 110 (36), pp 17715–17718
DOI: 10.1021/jp064046b
Publication Date (Web): August 22, 2006
Copyright © 2006 American Chemical Society
*

 Corresponding author. Phone:  +46 87908178. Fax:  +46 87908207. E-mail:  gerrit@kth.se.

Abstract

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The transport and recombination of electrons in dye-sensitized TiO2 solar cells were studied by analysis of the current and voltage response to a small square-wave light-intensity modulation. Solar cells were studied under working conditions by using potentiostatic and galvanostatic conditions. An increase in applied voltage, that is, from 0 V toward open-circuit voltage, was found to lead to faster electron transport at low light intensities, while it slowed transport at higher light intensities. This observation seems to be conflicting with the multiple trapping model with diffusive transport. An effective diffusion length at the maximum power point was calculated, and it was shown that it decreases with increasing light intensity.

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History

  • Published In Issue September 14, 2006
  • Received June 28, 2006
    Revised July 28, 2006

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