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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The electron collection efficiency in dye-sensitized solar cells (DSCs) is usually related to the electron diffusion length, L = (Dτ)1/2, 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 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, 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
Refereed: Yes
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: 28 Apr 2011 21:31
Last Modified: 10 Sep 2016 03:47

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