Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 646, Issue 1-2, Pages 43-51Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2010.01.007
Keywords
Dye solar cell; Impedance Spectroscopy; Surface states; Nanostructures
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Funding
- Ministerio de Ciencia e Innovacion [CSD2007-00007]
- Generalitat Valenciana [PROMETEO/2009/058]
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The dynamics of trapping coupled with charge transfer is analysed in the frequency domain for a model of the dye-sensitized solar cell. We solve the steady state occupations of the surface state and the resulting recombination currents, based on the assumption of detailed balance. We determine all the parameters that control the frequency response in Impedance Spectroscopy as a function of the steady state, and the characteristic shape of the impedance spectra. At large charge transfer rate the low frequency capacitance of the surface states is considerably reduced with respect to the thermodynamically defined equilibrium capacitance. We also show that the usual kinetics of recombination does not give a negative capacitance contribution. (C) 2010 Elsevier B.V. All rights reserved.
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