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Photoinduced reversible switching of charge carrier mobilityin conjugated polymers

Published online by Cambridge University Press:  26 June 2009

M. Weiter ,
J. Navrátil ,
M. Vala  and
P. Toman
M. Weiter
Affiliation:
Brno University of Technology, Faculty of Chemistry, Purkynova 118, 612 00 Brno, Czech Republic
J. Navrátil*
Affiliation:
Brno University of Technology, Faculty of Chemistry, Purkynova 118, 612 00 Brno, Czech Republic
M. Vala
Affiliation:
Brno University of Technology, Faculty of Chemistry, Purkynova 118, 612 00 Brno, Czech Republic
P. Toman
Affiliation:
Brno University of Technology, Faculty of Chemistry, Purkynova 118, 612 00 Brno, Czech Republic Institute of Macromolecular Chemistry, AS CR, v.v.i., Prague, Czech Republic
*
[email protected]
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Abstract

Photoinduced reversible switching of charge carrier mobility in conjugated polymers was studied by theoretical and experimental methods. The quantum chemical calculations showed that the presence of dipolar species in the vicinity of a polymer chain modifies the on-chain site energies and consequently increases the width of the distribution of hopping transport states. The influence of photoswitchable charge carrier traps on charge transport was evaluated by current-voltage measurement and by impedance spectroscopy method. It was found that deep traps switchable by photochromic reaction may significantly control the transport of charge carriers, which is exemplified as a significant decrease of the current and increase of parallel resistance measured by impedance spectroscopy.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 48 , Issue 1 , October 2009 , 10401
Copyright
© EDP Sciences, 2009

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