Effects of dye-adsorption solvent on the performances of the dye-sensitized solar cells based on black dye

Hironobu Ozawa, Megumi Awa, Takahiko Ono, Hironori Arakawa

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The effects of the dye-adsorption solvent on the performances of the dye-sensitized solar cells (DSSCs) based on black dye have been investigated. The highest conversion efficiency (10.6 %) was obtained in the cases for which 1-PrOH and the mixed solvent of EtOH and tBuOH (3:1 v/v) were employed as dye-adsorption solvents. The optimized value for the dielectric constant of the dye-adsorption solvent was found to be around 20. The DSSCs that used MeOH as a dye-adsorption solvent showed inferior solar-cell performance relative to the DSSCs that used EtOH, 1-PrOH, 2-PrOH, and 1-BuOH. Photo- and electrochemical measurements of black dye both in solution and adsorbed onto the TiO 2 surface revealed that black dye aggregates at the TiO 2 surface during the adsorption process in the case for MeOH. Both the shorter electron lifetime in the TiO 2 photoelectrode and the greater resistance in the TiO 2-dye-elecrolyte interface, attributed to the dye aggregation at the TiO 2 surface, cause the decrease in the solar-cell performance of the DSSC that used MeOH as a dye adsorption solvent. Black power: The conversion efficiency of the dye-sensitized solar cell based on black dye (see figure) strongly depends on the dielectric constant of the dye-adsorption solvent.

Original languageEnglish
Pages (from-to)156-162
Number of pages7
JournalChemistry - An Asian Journal
Volume7
Issue number1
DOIs
Publication statusPublished - Jan 2 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Organic Chemistry

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