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Effect of Chalcogen Atom Substitution on the Optoelectronic Properties in Cyclopentadithiophene Polymers

Planells, M; Schroeder, BC; McCulloch, I; (2014) Effect of Chalcogen Atom Substitution on the Optoelectronic Properties in Cyclopentadithiophene Polymers. Macromolecules , 47 (17) pp. 5889-5894. 10.1021/ma5014308. Green open access

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Abstract

We report the synthesis and characterization of a series of cyclopentadithiophene polymers containing thiophene, selenophene, and tellurophene as comonomers. The effect of the chalcogen atom has been studied by a range of techniques, including thermal, optical, electrochemical, and computational. The results showed that by increasing the size of the chalcogen atom, the optical band gap is reduced mainly due to a downshift in the LUMO energy level. In addition, the larger size also increases the intermolecular heteroatom−heteroatom interactions facilitating the formation of polymer aggregates. This led to not only a stronger red-shifted band in the UV−vis absorption spectrum as well as raise in the HOMO energy level but also a potential solubility issue for higher molecular weight polymers containing particularly tellurophene units.

Type: Article
Title: Effect of Chalcogen Atom Substitution on the Optoelectronic Properties in Cyclopentadithiophene Polymers
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/ma5014308
Publisher version: https://doi.org/10.1021/ma5014308
Language: English
Additional information: © ACS AuthorChoice under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: science & technology, physical sciences, polymer science, 25th anniversary article, field-effect transistors, solar-cells, conjugated polymer, tellurophene, spintronics, performance, chemistry, decade
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10048358
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