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Mechanism of charge recombination and IPCE in ZnO dye‐sensitized solar cells having I − /I 3 − and Br − /Br 3 − redox couple
Author(s) -
Rani Seema,
Suri Poonam,
Mehra Ram Mohan
Publication year - 2011
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.1011
Subject(s) - solar cell , equivalent series resistance , dye sensitized solar cell , electrolyte , redox , wavelength , electron , chemistry , charge carrier , recombination , conduction band , absorption (acoustics) , energy conversion efficiency , light intensity , photochemistry , analytical chemistry (journal) , materials science , optoelectronics , optics , electrode , physics , inorganic chemistry , biochemistry , quantum mechanics , voltage , chromatography , gene
The influence of intensity and wavelength variation on the solar cell parameters of two different ZnO‐based liquid state DSSCs named as Cell (A) ZnO/EosinY/LiI and Cell (B) ZnO/EosinY/LiBr was studied. It was found that V oc and I sc depend logarithmically and linearly on light flux, respectively, which indicates that light absorption and carrier diffusion do not limit the solar cell efficiency. The data was analyzed to ascertain the charge recombination mechanism between conduction band electrons and the electrolytes. The regeneration of dye due to I − /I 3 and Br − /Br 3 −redox couple was examined by studying the wavelength dependence of IPCE. An estimation of series and shunt resistance is made using two methods: (i) different illumination method (ii) single I – V curve, for the two cells in order to understand the role of the electrolyte in controlling the solar cell parameters. Copyright © 2010 John Wiley & Sons, Ltd.