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Electron diffusion and back reaction in dye-sensitized solar cells: the effect of nonlinear recombination kinetics


Reference:

Villanueva-Cab, J., Wang, H., Oskam, G. and Peter, L. M., 2010. Electron diffusion and back reaction in dye-sensitized solar cells: the effect of nonlinear recombination kinetics. Journal of Physical Chemistry Letters, 1 (4), pp. 748-751.

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Official URL:

http://dx.doi.org/10.1021/jz1000243

Abstract

The electron collection efficiency in dye-sensitized solar cells (DSCs) is usually related, to the electron diffusion length, L = (D tau)(1/2), where D is the diffusion coefficient of mobile electrons and r is their lifetime, which is determined by electron transfer to the redox electrolyte. Analysis of incident photon-to-current efficiency (IPCE) spectra for front and rear illumination consistently gives smaller values of L than those derived from small amplitude methods. We show that the IPCE analysis is incorrect if recombination is not first-order in free electron concentration, and we demonstrate that the intensity dependence of the apparent L derived by first-order analysis of IPCE measurements and the voltage dependence of L derived from perturbation experiments can be fitted using the same reaction order, gamma approximate to 0.8. The new analysis presented in this letter resolves the controversy over why L values derived from small amplitude methods are larger than those obtained from IPCE data.

Details

Item Type Articles
CreatorsVillanueva-Cab, J., Wang, H., Oskam, G. and Peter, L. M.
DOI10.1021/jz1000243
DepartmentsFaculty of Science > Chemistry
RefereedYes
StatusPublished
ID Code18818

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