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Electrochemical impedance spectroscopic analysis of dye-sensitized solar cells.
Journal article

Electrochemical impedance spectroscopic analysis of dye-sensitized solar cells.

  • Wang Q Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
  • Moser JE
  • Grätzel M
  • 2006-07-21
Published in:
  • The journal of physical chemistry. B. - 2005
Physical and Theoretical Chemistry
Materials Chemistry
Surfaces, Coatings and Films
English Electrochemical impedance spectroscopy (EIS) has been performed to investigate electronic and ionic processes in dye-sensitized solar cells (DSC). A theoretical model has been elaborated, to interpret the frequency response of the device. The high-frequency feature is attributed to the charge transfer at the counter electrode while the response in the intermediate-frequency region is associated with the electron transport in the mesoscopic TiO2 film and the back reaction at the TiO2/electrolyte interface. The low-frequency region reflects the diffusion in the electrolyte. Using an appropriate equivalent circuit, the electron transport rate and electron lifetime in the mesoscopic film have been derived, which agree with the values derived from transient photocurrent and photovoltage measurements. The EIS measurements show that DSC performance variations under prolonged thermal aging result mainly from the decrease in the lifetime of the conduction band electron in the TiO2 film.
Language
  • English
Open access status
closed
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Persistent URL
https://sonar.ch/global/documents/111677
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