| Issue |
Eur. Phys. J. Appl. Phys.
Volume 33, Number 3, March 2006
|
|
|---|---|---|
| Page(s) | 175 - 182 | |
| Section | Microelectronics and Optoelectronics | |
| DOI | https://doi.org/10.1051/epjap:2006022 | |
| Published online | 22 February 2006 | |
https://doi.org/10.1051/epjap:2006022
Field and temperature effects on the electronic mobility in Alq3 structures
Université de Limoges, Faculté des Sciences et Techniques, CNRS –
FRE 2701,
Laboratoire UMOP, 123 Av. Albert Thomas, 87060 Limoges, France
Corresponding author: amoliton@unilim.fr
Received:
6
September
2005
Revised:
13
October
2005
Accepted:
18
November
2005
Published online:
22
February
2006
Tris(8-hydroxyquinoline) aluminium (Alq3) inserted
in the structure ITO/Alq3/Al is used to show how dielectric spectroscopy and
a 
representation can separate
dielectric conductivity by bound charges from 
conductivity
due to residual pseudo free charges. Coupled with the I(V) characteristic, the representation allow to study the
mobility of these carriers as a function of the applied bias voltage V; then
the mobility was estimated to be 
cm2 V−1 s−1 (with V = 0), and we demonstrate that 
approximately follows a Poole-Frenkel like law. Consequently, these results
show that mobility determined by field effects is generally overestimated by
around one order of magnitude for an electric field at around 1
MV cm−1. More precisely, we demonstrate that pseudo free charges exhibit a field and weakly temperature dependent mobility, which is in contrast to
carriers involved in the trap–charge limited current regime which exhibit a
temperature dependent and field independent mobility.
PACS: 42.70.Jk – Polymers and organics / 72.20.Jv – Charge carriers: generation, recombination, lifetime, and trapping / 72.80.Le – Polymers; organic compounds (including organic semiconductors) / 73.61.Ph – Polymers; organic compounds / 85.60.Jb – Light-emitting devices
© EDP Sciences, 2006
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