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Phys Rev Lett. 2001 Apr 16;86(16):3602-5.

Polaron dynamics in a system of coupled conjugated polymer chains.

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Department of Physics and Measurement Technology, Linköping University, SE-581 83 Linköping, Sweden.


The motion of excitations such as polarons is believed to be of fundamental importance for the transport properties of conjugated polymers for the use in, e.g., polymer based LED's. We have investigated polaron dynamics in a system of coupled polymer chains in the presence of an external electric field. In particular, we focus on how a polaron migrates through the polymer lattice, i.e., the situation in which a polaron reaches a chain end and is scattered to the surrounding chains. We show that the outcome of this event strongly depends on the strength of the electric field, and we identify three different cases for the polaron migration.

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