Abstract
Non-linear 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 dominate the photocurrent I due to a novel electric-field-assisted tunnelling route for which ln I ∼ -E-2/3. For near-degenerate polymers with an electric field E which exceeds the confinement parameter and frequencies near twice the soliton energy, soliton formation is favored. Photocurrent data can then be used to identify the remarkable soliton conduction.
Original language | English |
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Pages (from-to) | 386-392 |
Number of pages | 7 |
Journal | EPL |
Volume | 65 |
Issue number | 3 |
DOIs | |
State | Published - 1 Feb 2004 |
ASJC Scopus subject areas
- General Physics and Astronomy