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In stretched polythiophene films, absorptions due to photo- and doping-induced (bi)polarons are found to be highly anisotropic, similar to a π-π * transition. It is also found that the generation efficiency of polarons does not depend on the polarization of excitation lights. This result is discussed in terms of an initial mechanism of photoinduced polarons.
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Kaneto et al. (1988) studied this question.
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