Free Access
J. Chim. Phys.
Volume 95, Number 6, June 1998
Page(s) 1427 - 1432
DOI: 10.1051/jcp:1998297

J. Chim. Phys. Vol. 95, N°6  p. 1427-1432

Transport mechanisms in conducting polymers: do general behaviours exis

J.P. Travers

Laboratoire de Physique des Métaux Synthétiques, UMR 5819, CEA-CNRS-UJF, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 38054 Grenoble cedex 9, France

We review several studies of transport properties of conducting polymers (CP) as a function of a parameter related to their structure or microstructure. We show that in strongly disordered CP, electron transport is dominated by hopping between conducting grains separated by insulating barriers. Although the nature of the metal-insulator transition is still a controversial topic in weakly disordered CP, several results indicate that heterogeneities play an important role. Thus heterogeneous disorder seems to control the conductivity of a large majority of CP.

Plusieurs études sur la conductivité des polymères conducteurs (PC) en relation avec la microstructure sont rassemblées. Dans les PC très désordonnés, les sauts entre grains conducteurs séparés par des barrières isolantes dominent la conduction. Bien que la situation soit moins claire dans les PC peu désordonnés, des résultats indiquent que les hétérogénéités y jouent un rôle important. Ainsi, le désordre de nature hétérogène semble contrôler la conductivité de la grande majorité des PC.

Key words: conducting polymers -- conductivity -- hopping -- disorder, heterogeneities

© EDP Sciences 1998

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