Imidazole-Based Sensitizers Containing Double Anchors for Dye-Sensitized Solar Cells

Yung Sheng Yen, Jen Shyang Ni, Tse Yen Lin, Wei I. Hung, Jiann T. Lin, Ming-Chang P. Yeh

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

New imidazole-based organic dyes with two 2-cyanoacetic acid acceptors/anchors connected at the C-4 and C-5 positions, and a carbazole or arylamine donor connected at the C-2 position of the imidazole entity were synthesized and used as sensitizers for dye-sensitized solar cells. The dyes exhibit optical absorption from 300-600 nm with high molar extinction coefficients. The inclusion of a hexyl chain at the nitrogen atom of the imidazole was found to result in a large twist of the C-4 segment from the imidazole and, hence, to less efficient electron injection. Although dye aggregation results in light harvesting at longer wavelength regions, it also leads to excited-state quenching and hinders electron injection. Consequently, only moderate conversion efficiencies of DSSCs were achieved. Upon addition of CDCA coadsorbents, up to ca. 30 % improvement of the cell efficiency was achieved. The best cell efficiency reached 4.97 % with addition of 50 mM CDCA.

Original languageEnglish
Pages (from-to)7367-7377
Number of pages11
JournalEuropean Journal of Organic Chemistry
Volume2015
Issue number33
DOIs
Publication statusPublished - 2015 Nov 1

Keywords

  • Donor-acceptor systems
  • Dyes
  • Electrochemistry
  • Nitrogen heterocycles
  • Sensitizers
  • Solar cells

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry

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