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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.
|Number of pages||4|
|Journal||Journal of Physical Chemistry Letters|
|Early online date||29 Jan 2010|
|Publication status||Published - 18 Feb 2010|
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- 1 Finished
METAL SUBSTRATE MOUNTED FLEXIBLE DYE SENSITISED SEMICONDUCTO R SOLAR CELLS
Engineering and Physical Sciences Research Council
1/07/07 → 31/08/10
Project: Research council