Electronic tuning effects via π-linkers in tetrathiafulvalene-based dyes
Publisher DOI
Abstract
Four new tetrathiafulvalene (TTF)-based dyes featured with a donor–bridge–acceptor (D–π–A) structure were synthesized and characterized. All of them undergo two reversible oxidations to form stable radical cation and dication species. The electronic interactions between the TTF donor and the cyanoacrylic acid acceptor through the different π-linkers have been demonstrated by the presence of a photo-induced intramolecular charge-transfer (ICT) absorption band in the visible region. A red shift of the ICT state can be finely tuned by the degree of aromaticity and extended conjugation of π-bridges. To some extent, the oxidation potentials of these dyes are affected by the nature of π-bridges. They have been applied in organic dye-sensitized solar cells, showing relatively low power conversion efficiencies of up to 0.87% due to substantial charge recombination losses.
Date Issued
2014
Publication Type
Article
Subject(s)
Language(s)
en
Author(s)
Additional Credits
Journal
New journal of chemistry
Publisher
Royal Society of Chemistry
ISSN
1144-0546
Access(Rights)
restricted