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Chemical Modification on Hierarchically Structured ZnO Films for Energy Conversion Efficiency Enhancement of Dye-Sensitized Solar Cells

Published online by Cambridge University Press:  01 February 2011

Qifeng Zhang ,
Samson A Jenekhe  and
Guozhong Cao
Qifeng Zhang
Affiliation:
qfzhang@u.washington.edu, University of Washington, Materials Science and Engineering, Seattle, WA, 98195, United States
Samson A Jenekhe
Affiliation:
jenekhe@u.washington.edu, University of Washington, Chemical Engineering, Seattle, WA, 98195, United States
Guozhong Cao
Affiliation:
gzcao@u.washington.edu, University of Washington, Materials Science and Engineering, Seattle, WA, 98195, United States
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Abstract

We report the synthesis of ZnO aggregates in the presence of lithium salt and the enhancement on the energy conversion efficiency of dye sensitized solar cells when the photoelectrode films consist of as-synthesized ZnO aggregates. The conversion efficiency for ZnO film consisting of aggregates synthesized with lithium involvement is significantly improved up to 5.8%, which is 32% higher than that of 4.4% obtained for pure ZnO film. Such an enhancement can be attributed to the effect of lithium-induced changes on the morphology and crystallinity of aggregates, the optical absorption of films, and the surface chemistry of ZnO, which provides the film with decreased electron trapping and increased refractive index, and enhances the electronic coupling between the dye molecules and ZnO.

Keywords

photovoltaicthin filmnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1102: Symposium LL – Energy Harvesting–From Fundamentals to Devices , 2008 , 1102-LL06-08
Copyright
Copyright © Materials Research Society 2008

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