The morphological dependence of charge transport in a soluble luminescent conjugated polymer

Tan, Czek Haan and Inigo, AR and Fann, Wunshain and Wei, Pei-Kuen and Perng, Gung-Yeong and Chen, Shaw-An (2002) The morphological dependence of charge transport in a soluble luminescent conjugated polymer. Organic Electronics, 3 (2). pp. 81-88. ISSN 1566-1199

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Abstract

Charge transport in poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] is studied by employing the time-of-flight technique. Film morphology plays a key role in determining the charge transport properties. Samples prepared from toluene feature non-dispersive transport. However, after thermal annealing, charge transport is no longer nondispersive and hole mobility drops for about one order of magnitude. Near-field scanning optical microscope images show that annealing enhanced film inhomogeneity. We propose that the inhomogeneity is responsible for the changes in the transport properties.