Issue 12, 2001

Abstract

Mobilities of charge carriers in a copolymer film where a possible charge transport is restricted to an interchain path are measured by electrochemical means with doping level as a parameter. The mobility in the low doping regime, corresponding to that of polarons, is 10−6 cm2 V−1 s−1, comparable with polaron mobilities in polythiophene films where hopping transports via interchain and intrachain routes are both feasible. The coincidence suggests strongly a potential role of the interchain hopping transport in the conduction mechanism of common conducting polymers. As the doping level increases, the mobility falls down to 0.4 × 10−6 cm2 V−1 s−1 and then rises up to 6 × 10−6 cm2 V−1 s−1. Based on spectroelectrochemical measurements of the copolymer film, the decrease of the mobility is interpreted in terms of the generation of cation radical π-dimers that are inactive in charge transport. The mobility increase in a high doping region is ascribed to some structural change of a polymer network, leading to enhancement of the interchain hopping probability.

Graphical abstract: Mobilities of charge carriers hopping between π-conjugated polymer chains

Article information

Article type
Paper
Submitted
23 Apr 2001
Accepted
25 Sep 2001
First published
31 Oct 2001

J. Mater. Chem., 2001,11, 3043-3048

Mobilities of charge carriers hopping between π-conjugated polymer chains

X. Jiang, Y. Harima, L. Zhu, Y. Kunugi, K. Yamashita, M. Sakamoto and M. Sato, J. Mater. Chem., 2001, 11, 3043 DOI: 10.1039/B103599C

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