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

Villanueva-Cab, Julio, Wang, Hongxia, Oskam, Gerko, & Peter, Laurence M. (2010) Electron diffusion and back reaction in dye-sensitized solar cells : the effect of nonlinear recombination kinetics. The Journal of Physical Chemistry Letters, 1(4), pp. 748-751.

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Abstract

The electron collection efficiency in dye sensitized solar cells (DSC) is usually related to the electron diffusion length, L = Dτ , where D is the diffusion coefficient of mobile electrons and τ is their lifetime, which is determined by electron transfer to the redox electrolyte. Analysis of 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, γ = 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.

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ID Code: 40982
Item Type: Journal Article
Keywords: Dye-sensitized Solar Cells, Electron Diffusion, Electron Back Reaction, IPCE
DOI: 10.1021/jz1000243
ISSN: 1948-7185
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Transport Properties and Non-Equilibrium Processes (030607)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 American Chemical Society
Copyright Statement: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Deposited On: 29 Apr 2011 07:31
Last Modified: 01 Mar 2012 05:46

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