Dependence of the Photocurrent Conversion Efficiency of Dye-Sensitized Solar Cells on the Incident Light Intensity

Autor:	T. Trupke and, Peter Würfel, I. Uhlendorf
Rok vydání:	2000
Předmět:	Photocurrent Photon Chemistry business.industry Energy conversion efficiency Electron Electrolyte Ray Surfaces Coatings and Films Dye-sensitized solar cell parasitic diseases Materials Chemistry Optoelectronics cardiovascular diseases Physical and Theoretical Chemistry business Current density
Zdroj:	The Journal of Physical Chemistry B. 104:11484-11488
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp001392z
Popis:	The incident photon to current conversion efficiency (IPCE) of dye-sensitized solar cells is measured as a function of the incident photon current density. A characteristic dependence of the IPCE on the incident light intensity with a maximum value for absorbed photon current densities in the range of jγ,abs = 1017 cm-2 s-1 is observed for all cells investigated in this study. The IPCE decreases significantly for large absorbed photon current densities (jγ,abs > 1018 cm-2 s-1) and for small absorbed photon current densities (jγ,abs < 1016 cm-2 s-1). The decrease of the IPCE at large incident light intensities is due to the diffusion limitation of the electrolyte within the nanocrystalline TiO2 electrode. The decrease of the IPCE at low incident light intensities can be explained by the loss of photogenerated electrons via surface-state-mediated electron transfer into the electrolyte. The strong dependence of the IPCE on the incident light intensity has consequences for the efficiency of a dye-sensitized s...
Databáze:	OpenAIRE
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