Effective sol-gel nanocoatings on ZnO electrodes for suppressing recombination in dye-sensitized solar cells

Shintaro Ueno, Shinobu Fujihara

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Attempts have been made to improve the performance of dye-sensitized solar cells by forming metal-oxide nanocoating layers on ZnO electrodes by a sol-gel transformation. SiO 2, Nb 2O 5, TiO 2, or ZrO 2 nanocoating layers could be formed by dipping ZnO films into metal alkoxide solutions of low concentrations and subsequent heat treatments. The performance of DSSCs using the coated ZnO electrodes depends strongly on the structure of coating layers such as the thickness and the surface coverage, which are significantly influenced by the coating conditions. In particular, SiO 2 and Nb 2O 5 coating layers are effective to suppress the recombination by constructing the energy barrier at the ZnO/electrolyte interface and enhance energy conversion efficiency. It is found that the coating layers also hinder the grain growth of ZnO, contributing to the enhanced cell performance as well.

Original languageEnglish
Article number268173
JournalInternational Journal of Photoenergy
Volume2012
DOIs
Publication statusPublished - 2012

Fingerprint

Sol-gels
solar cells
dyes
gels
Coatings
Electrodes
electrodes
coatings
Energy barriers
Metal forming
Grain growth
Energy conversion
Oxides
Electrolytes
energy conversion efficiency
Conversion efficiency
alkoxides
dipping
metal films
Metals

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

Cite this

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abstract = "Attempts have been made to improve the performance of dye-sensitized solar cells by forming metal-oxide nanocoating layers on ZnO electrodes by a sol-gel transformation. SiO 2, Nb 2O 5, TiO 2, or ZrO 2 nanocoating layers could be formed by dipping ZnO films into metal alkoxide solutions of low concentrations and subsequent heat treatments. The performance of DSSCs using the coated ZnO electrodes depends strongly on the structure of coating layers such as the thickness and the surface coverage, which are significantly influenced by the coating conditions. In particular, SiO 2 and Nb 2O 5 coating layers are effective to suppress the recombination by constructing the energy barrier at the ZnO/electrolyte interface and enhance energy conversion efficiency. It is found that the coating layers also hinder the grain growth of ZnO, contributing to the enhanced cell performance as well.",
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