Dependence of the efficiency improvement of black-dye-based dye-sensitized solar cells on alkyl chain length of quaternary ammonium cations in electrolyte solutions

Hironobu Ozawa, Yu Okuyama, Hironori Arakawa

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Dependence of the suppression of the backward electron transfer reaction from the TiO2 photoelectrode to I3 - in the electrolyte on the alkyl chain length of the quaternary ammonium cation has been investigated for further efficiency improvement of high-performance cosensitized dye-sensitized solar cells (DSCs). The tetraheptylammonium cation was found to be more effective than the tetraethylammonium and tetrabutylammonium cations for the suppression of the backward electron transfer reaction without changing the conduction band energy of TiO2. 12.0 % conversion efficiency, which is the second highest efficiency for DSCs based on ruthenium sensitizers, was achieved in the cosensitized DSC with Black dye and D131 by using an electrolyte solution containing a moderate concentration of tetraheptylammonium iodide. Length matters: Dependence of the suppression of electron leakage on the alkyl chain length of the quaternary ammonium cation is investigated. 12.0 % conversion efficiency is achieved in a dye-sensitized solar cell fabricated with Black dye and D131 using the tetraheptylammonium cation (THA+).

Original languageEnglish
Pages (from-to)1201-1206
Number of pages6
JournalChemPhysChem
Volume15
Issue number6
DOIs
Publication statusPublished - Apr 14 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Dependence of the efficiency improvement of black-dye-based dye-sensitized solar cells on alkyl chain length of quaternary ammonium cations in electrolyte solutions'. Together they form a unique fingerprint.

  • Cite this