Effect of electron rich π-linkers on the functional properties of dyes featuring dithieno[3,2-b:2′,3′-d]pyrrole donor

Sunil Kumar, K. R.Justin Thomas*, Chun Ting Li, Miao Syuan Fan, Kuo Chuan Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this paper, organic dyes containing dithienopyrrole (DTP) donor, linkers such as thiophene or dithienopyrrole and cyanoacrylic acid acceptor are reported. The impact of different π-linkers on photophysical, electrochemical and photovoltaic properties is studied. The dyes containing dithienopyrrole linker showed improved light harvesting efficiency and reduced oxidation potentials than the thiophene analogs. The major absorption originates from the charge transfer transition, which shifts progressively to red region on increasing the number of heteroaromatic linkers. Additionally, the presence of N-fluorenyldithieonopyrrole in the conjugation bridge is beneficial to retard the charge recombination process. Therefore, the dye containing a dithienopyrrole linker showed the highest efficiency of 5.94% in the series attributable to its high JSC and VOC values. However, a dye containing two dithienopyrrole units in the conjugation pathway exhibited low power conversion efficiency irrespective of its intense absorption attributable to the low charge collection efficiency and reduced electron lifetime.

Original languageEnglish
Pages (from-to)614-623
Number of pages10
JournalDyes and Pigments
Volume160
DOIs
Publication statusPublished - 2019 Jan
Externally publishedYes

Keywords

  • Absorption spectra
  • Dithienopyrrole
  • Donor-acceptor compounds
  • Dye sensitized solar cells
  • Organic dyes
  • Thiophene

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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