A new method for the determination of electronic mobility in organic materials associated with optoelectronic devicesA. Moliton, W. Rammal and B. Lucas
Université de Limoges, Faculté des Sciences et Techniques, CNRS - FRE 2701 Laboratoire UMOP - 123 Av. Albert Thomas, 87060 Limoges, France
received 10 June 2005; accepted in final form 5 October 2005
published online 4 November 2005
It is proposed, by way of studies made using tris(8-hydroxyquinoline) aluminium (Alq3) in an ITO/Alq3/Al structure, that dielectric spectroscopy (represented by ) and a determination of I(V) characteristics permit a good estimation of charge mobility (. The value of determined by this new method was found to be ca. cm2 V-1 s-1, without bias voltage. This method also allows a facile determination of field effects, and it was possible to demonstrate that followed a Poole-Frenkel law. In addition, mobilities determined via field effects alone generally led to overestimation of around one order of magnitude for an electric field of around 1 V cm-1.
42.70.Jk - Polymers and organics.
72.80.Le - Polymers; organic compounds (including organic semiconductors).
85.60.Jb - Light-emitting devices.
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