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Photocurrent in conjugated polymers

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Type
Published Article
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Submission Date
Identifiers
DOI: 10.1209/epl/i2003-10102-7
arXiv ID: cond-mat/0304522
Source
arXiv
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Unknown
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Abstract

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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