Electrochemical impedance spectroscopy (EIS) is one of the excellent methods to obtain information concerning the electron transport processes in dye-sensitized solar cells (DSSCs). However, there are some problems on analysis by EIS. (1) A number of studies analyzed the electron transport processes based on the EIS measurements under dark conditions, while the photocurrent-voltage (I-V) measurements were carried out under one-sun illumination conditions. We present that EIS measurement should be carried out under the same illumination condition as I-V measurement is performed. (2) So far impedance analysis in DSSCs has been carried out in many papers based on the assumption of constant photoelectron generation regardless of the distance in the electrode under open circuit condition. However, incident light should be absorbed efficiently in the solar cell. So, there must be strong distribution of light intensity in titania electrode, resulting in strong distribution of photoelectron generation.

Consideration on some problems of analysis by electrochemical impedance spectroscopy

245th National Meeting (2013)

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