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Optical absorption from polarons and bipolarons in polythiophene

Authors
Journal
Synthetic Metals
0379-6779
Publisher
Elsevier
Publication Date
Volume
24
Issue
3
Identifiers
DOI: 10.1016/0379-6779(88)90256-1

Abstract

Abstract We present here a theoretical calculation, within the one-electron Hückel model, of the optical absorption due to polarons and bipolarons in doped polythiophene. The results are used to describe the absorption spectra at thermal equilibrium, when the two kinds of excitation are present. Comparison with experimental data obtained in the case of doping shows that the Coulomb effects must be taken into account and the binding energy to the dopant is estimated to be about 0.14 eV. Although the bipolaron still remains the lowest-lying charged excitation, the contribution of Coulomb effects is shown to increase the proportion of polarons at thermal equilibrium.

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