Photocurrent in conjugated polymersB. Horovitz and E. Pazy
Department of Physics and Ilze Katz center for nanotechnology Ben-Gurion University of the Negev - Beer-Sheva 84105, Israel
(Received 2 June 2003; accepted in final form 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.
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