Abstract
We report detailed measurements of the excitation profile of the absorption spectrum due to photoexcited polarons and bipolarons in the non-degenerate ground state conjugated polymer poly(3-methylthiophene). Two new sharp peaks at 2.10 and 2.25 eV are observed. The separation of the two peaks, which corresponds to an intrachain vibration, is taken as evidence for a channel of photogeneration of polarons via an intrachain process in poly(3-methylthiophene).
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