Field-assisted ionization of molecular doping in conjugated polymers
article
The field- and temperature dependence of the charge transport in solution-processed poly[2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) doped with tetrafluoro- tetracyanoquinodimethane (F4-TCNQ) is investigated. Conventional charge transport models based on a density- and field-dependent mobility in combination with a constant background hole density from the dopant do not explain the strongly enhanced hole current at high electric fields. Addition of field-assisted ionization of F4-TCNQ with a field-enhancement factor ̃exp(γ pE), which increases with decreasing temperature and doping concentration, consistently describes the charge transport in F4-TCNQ doped MEH-PPV. © 2010 Elsevier B.V. All rights reserved.
Topics
Carrier mobilityCharge transportDopingField-dependent free hole densityA-densityCharge transportCharge-transport modelDopingDoping concentrationF4-TCNQField enhancement factorField-dependent mobilityFree hole densityHigh electric fieldsHole currentHole densitiesMEH-PPVMethoxyMolecular dopingP-phenylene vinyleneSolution-processedTemperature dependenceTetrafluoro-tetracyanoquinodimethaneConjugated polymersElectric fieldsHole mobilityIonizationOrganic polymersParticle detectorsDoping (additives)
TNO Identifier
461577
ISSN
15661199
Source
Organic Electronics: physics, materials, applications, 11(7), pp. 1261-1267.
Pages
1261-1267
Files
To receive the publication files, please send an e-mail request to TNO Repository.