Journal
ORGANIC ELECTRONICS
Volume 11, Issue 7, Pages 1261-1267Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2010.03.012
Keywords
Charge transport; Doping; Field-dependent free hole density; Carrier mobility
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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 similar to exp(gamma root E), which increases with decreasing temperature and doping concentration, consistently describes the charge transport in F4-TCNQ doped MEH-PPV. (c) 2010 Elsevier B.V. All rights reserved.
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