Impurity enhancement of hopping parameters in conducting polymers
- 15 October 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (12), 7659-7662
- https://doi.org/10.1103/physrevb.42.7659
Abstract
The interchain and on-chain hopping parameters for polyacetylene, heavily doped with one of the alkali metals, have been corrected for the potential due to the dopant ions. We find that the on-chain hopping is enhanced by ∼10% in the neighborhood of a dopant, which is of the same order as the modulation of the uniform-chain value (2.5 eV) by the dimerization. The interchain hopping for adjacent orbitals on nearest-neighbor chains is enhanced by ∼100% in the neighborhood of a dopant; thus the dopants may act as ‘‘bridges’’ for interchain transport.Keywords
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