A Mechanism of Charged Soliton Conduction in a Doped Polyacetylene Chain

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Abstract
In a doped polyacetylene chain array of charged solitons is pinned by the Coulomb field of dopant ions so that it cannot make translational motion. However, the soliton lattice can have interstitial and hole dislocations. These dislocations can move and carry electric current by successive translocations with activation energies. The formation energy of dislocations in the soliton lattice and their motional activation energies are estimated using the soliton lattice solutions in the continuum versions of the PPP and SSH models. These energies are shown to decrease very rapidly with conductivity due to soliton dislocations is calculated and shown to explain the main trends of the doping concentration and temperature dependences of the observed conductivity.

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