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Proceedings Paper

Hopping charge transport in conducting polymers studied by dc conduction and dielectric response analysis
Author(s): Simone Capaccioli; E. Butta; Silvia Corezzi; Mauro Lucchesi; Pierangelo A. Rolla
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Paper Abstract

The conducting polymer poly(3n-decylprrole) (P3DP) has a promising chemical stability and processability. The long alkylic chains makes P3DP soluble in common organic solvents even if they partially hinder a regular molecular arrangement. On account of structural disorder, the materials has a moderate conductivity despite the high doping level. The d.c. conductivity and the dielectric response of P3DP films with different dopants and synthesis conditions were measured at temperatures between 80 and 300 K. The d.c. conductivity of all the samples was well described by the variable range hopping model; the hopping parameters were found to be much affected by the synthesis and doping conditions. The electrical response exhibited a well-defined relaxation peak, visible only after deducting the d.c. conductivity contribution from the loss factor. The temperature behavior of the loss peak frequency parallelled that of the d.c. conductivity. The Barton-Nakajima-Namikawa equation, relating d.c. conductivity, relaxation time and relaxation strength, was verified. The relaxation strength, too large for being connected with a dipolar relaxation, was ascribed to the displacement of hoping charges. The conclusion of the analysis has been that the electrical response of the system was dominated by the hopping charge transport.

Paper Details

Date Published: 23 October 1998
PDF: 12 pages
Proc. SPIE 3471, Xerographic Photoreceptors and Organic Photorefractive Materials IV, (23 October 1998); doi: 10.1117/12.328156
Show Author Affiliations
Simone Capaccioli, Univ. degli Studi di Pisa (Italy)
E. Butta, Univ. degli Studi di Pisa (Italy)
Silvia Corezzi, Univ. degli Studi di Pisa (Italy)
Mauro Lucchesi, Univ. degli Studi di Pisa (Italy)
Pierangelo A. Rolla, Univ. degli Studi di Pisa (Italy)

Published in SPIE Proceedings Vol. 3471:
Xerographic Photoreceptors and Organic Photorefractive Materials IV
Stephen Ducharme; James W. Stasiak; James W. Stasiak, Editor(s)

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