Quantitative study of solvent effects on electron injection efficiency for black-dye-sensitized nanocrystalline TiO2 films

Ryuzi Katoh, Motohiro Kasuya, Akihiro Furube, Nobuhiro Fuke, Naoki Koide, Liyuan Han

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

The effects of various solvents on the electron injection efficiency for nanocrystalline TiO2 films sensitized with the black dye trithiocyanato(4,4′,4″-tricarboxy-2,2′:6′,2″-terpyridine)ruthenium(II) (Ru(tcterpy)(NCS)3) have been studied quantitatively. The electron injection efficiency for the film dried in air was estimated as 0.4 using a time-resolved microwave conductivity technique. Using transient absorption measurements, we estimated the efficiency of electron injection for TiO2 films in various solvents. Acetonitrile, which is widely considered to be the best solvent for solar cell performance, had the highest efficiency (∼0.65), and other solvents (3-methoxypropionitrile, γ-butyrolactone, and propylene carbonate) had lower efficiencies. These results suggest that characteristic interactions between the black dye and the -CN groups of solvents are important for achieving higher electron injection efficiency.

Original languageEnglish
Pages (from-to)698-703
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume93
Issue number6-7
DOIs
Publication statusPublished - 2009 Jun
Externally publishedYes

Keywords

  • Black dye
  • Dye-sensitized solar cells
  • Electron injection process
  • TiO
  • Transient absorption spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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