Abstract
Abstract In this paper, the effects of disorder on the electronic structure of doped trans-polyacetylene are evaluated. In effect, at the high doping levels currently obtained on (CH)x, it is not realistic to consider the dopant molecules as isolated impurities. Therefore we have examinated in this work how a random distribution of dopant molecules broadens the impurity levels lying within the band gap. We consider a model where the molecules form covalent bonds with the neighbouring n orbitals. Making use of the SSH model for (CH)X chain, the electronic density of states is obtained by averaging the Green's function over the random distribution of dopants along the lines of a cluster CPA. From our results, we discuss the formation of impurity bands in the gap and their dependence on both the doping concentration and the chemical nature of the doping molecules.
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