Abstract
The steady state photoconductivity (PC) in iodine doped transpolyacetylene (CH) x, polymerized by the modified Naarmann method, has been studied. Comparing doped (CH) x, with undoped (CH) x, the PC of the former is about 3≈4 order of magnitude higher than that of the latter, and saturation phenomena in doped samples are discovered. These effects are explained by a model in which photo-generated charged soliton pairs go through geminate recombination and decay rapidly to emit phonons, and the charged solitons produced by doping bound in the potential wells of dopant ions jump over the wells with the help of these phonons, and become free charge carriers to contribute to the PC.
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