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Mesoscopic study of bipolar charge transport in polymer-based devices

Ramos, MMD; Stoneham, AM; (2001) Mesoscopic study of bipolar charge transport in polymer-based devices. Synthetic Metals , 122 (1) 149 - 151. 10.1016/S0379-6779(00)01333-3. Green open access

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We present generalised Monte-Carlo calculations of bipolar charge carrier transport in polydiacetylene (PDA) to assess effects of some key factors on the properties of polymer-based light-emitting diodes (PLEDs). Our mesoscopic model includes specific realisations of the polymer network and examines the effect of polymer structural order on current flow and charge recombination within the polymer layer. Specifically addressed are the issues concerning the fractions of polymer strands contributing to the charge injection processes at electrode interfaces and to electroluminescence (EL). Our results suggest that radiative recombination increases as short chain concentration increases, whereas current efficiency shows;m opposite behaviour. Radiative recombination decreases as charge injection efficiency decreases and its internal efficiency seems to saturate for a luminescent chain concentration > 30%. Our results also suggest that both current efficiency and space-charge increases as charge injection efficiency decreases. Polymer disorder due to inclusions in the network does seem to contribute to reduce both current and recombination efficiencies. (C) 2001 Elsevier Science B.V. All rights reserved.

Type: Article
Title: Mesoscopic study of bipolar charge transport in polymer-based devices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/S0379-6779(00)01333-3
Publisher version: http://dx.doi.org/10.1016/S0379-6779(00)01333-3
Language: English
Additional information: Text made available to UCL Discovery by kind permission of Elsevier B.V., 2012. This paper is published in a special issue comprising approximately 50 papers, all presented at the special symposium ``Organic Electronics: From Light Emitting Diodes to Integrated Circuits''. The symposium was held within the framework of the EMRS Spring Meeting in Strasbourg from May 30th to June 2nd, 2000. Issue edited by H. von Seggern
Keywords: Mesoscopic modelling, conducting polymers, electroluminescence, CONJUGATED POLYMERS, CONDUCTING POLYMERS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/129087
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