Theory of the impedance of charge transfer via surface states in dye-sensitized solar cells
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1016/j.jelechem.2010.01.007 |
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Title
Theory of the impedance of charge transfer via surface states in dye-sensitized solar cellsAuthor (s)
Date
2010Publisher
ElsevierISSN
15726657Bibliographic citation
Journal of Electroanalytical Chemistry, 646, 02-ene, p. 43-51Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
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 ... [+]
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. © 2010 Elsevier B.V. All rights reserved. [-]
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- FCA_Articles [501]