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Proceedings Paper

Charge transport mechanism in transpolyacetylene
Author(s): G. P. Das; A. Todd Yeates; Douglas S. Dudis
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Paper Abstract

Both theoretical and experimental studies in the past have indicated that the charge transport in lightly doped polyacetylene is due primarily to traveling charged solitonic waves along the polymer chain backbone accompanied by hopping from one chain to another. The conductivity in this model is still dictated by a bandgap. The nature of the ground and excited states of the doped system, however, is not fully understood. Previous ab initio calculations on polyenes doped by a single iodine atom have brought out the interesting feature that, while calculations at the Hartree- Fock level lead to the charge-transfer state as the ground state, a correlated calculation, on the other hand, shows it to be an excited state with the ground state showing little charge transfer. Since, however, only polyiodide anions I3-, I5-, etc. are found in solution rather than neutral radicals such as I, I3 etc., inferences based on the calculation employing a single iodine atom are not conclusive. We present here a systematic ab initio study in which the nature of the ground and excited states of polyenes, doped with iodine, are investigated.

Paper Details

Date Published: 1 December 1997
PDF: 7 pages
Proc. SPIE 3145, Optical Probes of Conjugated Polymers, (1 December 1997); doi: 10.1117/12.284156
Show Author Affiliations
G. P. Das, Air Force Wright Lab. (United States)
A. Todd Yeates, Air Force Wright Lab. (United States)
Douglas S. Dudis, Air Force Wright Lab. (United States)

Published in SPIE Proceedings Vol. 3145:
Optical Probes of Conjugated Polymers
Z. Valy Vardeny; Lewis J. Rothberg, Editor(s)

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