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Narrow bandgap and enhanced electroconductivity in a dihydropyrene–thiophene copolymer

Authors
Journal
Polymer
0032-3861
Publisher
Elsevier
Publication Date
Volume
50
Issue
8
Identifiers
DOI: 10.1016/j.polymer.2009.02.019
Keywords
  • Copolymer
  • Non-Benzenoid
  • Narrow Bandgap

Abstract

Abstract Incorporation of π electron-rich dihydropyrene units into the polymer backbone of polythiophene afforded a conducting polymer with narrow bandgap energy of about 1.0 eV. Doping of this polymer with iodine showed an optimum conductivity of about 1.0 S cm −1. The quinoid character and a small highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO–LUMO) separation in the dihydropyrene are believed to account for the observed semi-conducing properties of this dihydropyrene–thiophene copolymer. The dihydropyrene unit in the copolymer was found to exhibit a significantly higher thermal stability than the parent molecule.

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