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.
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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|Item Type:||Journal Article|
|Keywords:||Dye-sensitized Solar Cells, Electron Diffusion, Electron Back Reaction, IPCE|
|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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