Polaron dynamics in thin polythiophene films studied with time-resolved photoemission |
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Authors: | Erwan?Varene Email author" target="_blank">Petra?TegederEmail author |
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Institution: | 1.Fachbereich Physik,Freie Universit?t Berlin,Berlin,Germany |
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Abstract: | Femtosecond time-resolved two-photon photoemission spectroscopy is employed to study the dynamics of an excited state in a
thin regioregular poly(3-hexylthiophene) (RR-P3HT) film deposited on a conducting polymer poly(3,4-ethylene-dioxythiophene):
poly-(styrenesulfonate) (PEDT:PSS) electrode following optical excitation at 2.1 eV. We found that the biexponential decay
of this excited state has a fast component (2.6 ps) assigned to bound polaron pairs which recombine quickly or separate to
be added to the slow component (7.6 ps). The latter is attributed to polarons generated via charge transfer between adjacent
polymer chains. |
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