Photocurrent in conjugated polymers

Details Photocurrent in conjugated polymers Photocurrent in conjugated polymers

2003-04-23

arxiv.org/abs/cond-mat/0304522v1

Europhys. Lett. 65, 386 (2004)

Physics

Condensed Matter

4 pages, 2 eps figures, Revtex

Scientific paper

10.1209/epl/i2003-10102-7

Nonlinear photocurrent carriers in conjugated polymers, such as polarons, bipolarons and solitons, are considered at low photon energies where a tunnelling process is necessary. We show that polarons usually dominate the photocurrent I due to a novel electric field assisted tunnelling for which ln(I) ~ -E^{-2/3}. For near degenerate polymers an electric field E which exceeds the confinement potential and frequencies above twice the soliton energy, soliton tunnelling is favored. Photocurrent data can then be used to identify the remarkable phenomenon of soliton conduction.

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