Volume 65, Number 3, February 2004
|Page(s)||386 - 392|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 January 2004|
Photocurrent in conjugated polymers
Department of Physics and Ilze Katz center for nanotechnology Ben-Gurion University of the Negev - Beer-Sheva 84105, Israel
Accepted: 28 November 2003
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 . 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.
PACS: 71.38.-k – Polarons and electron-phonon interactions / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 71.38.Mx – Bipolarons
© EDP Sciences, 2004
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