Dr. Dirk Hertel Profile

Dr. Dirk Hertel

at Univ zu Köln

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Proceedings Article | 10 April 2001 Paper

Stationary and transient photoconduction in conjugated polymers

Vladimir Arkhipov, Siegfried Barth, Evguenia Emelianova, Dirk Hertel, Heinz Baessler

Proceedings Volume 4415, (2001) https://doi.org/10.1117/12.425483

KEYWORDS: Polymers, Excitons, Temperature metrology, Electrodes

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The problem of charge carrier photogeneration in conjugated polymers is related to the question concerning the singlet excitation binding energy. Measurements of the cw- photoconduction in several conjugated polymers as a function of photon energy, electric field, and temperature under different cell geometries indicate that excitons can dissociate at an electrode as well as via sensitization in the bulk. Intrinsic photogeneration can also occur at higher photon energies via dissociation of vibrationally excited singlet excitons. Charge transport, monitored via time-of- flight signals, can be rationalized in terms of a disorder concept except for a ladder-type poly-(para-phenylene) film in which built-in disorder is weak.

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