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A Unified Model for the Space Charge Limited Currents in Organic Materials Combining Field Dependent Mobility and Poole-Frenkel Detrapping

Published online by Cambridge University Press:  21 March 2011

S. C. Jain ,
W. Geens ,
V. Kumar ,
A. Kapoor ,
A. Mehra ,
T. Aernouts ,
J. Poortmans ,
R. Mertens  and
M. Willander
S. C. Jain
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
W. Geens
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
V. Kumar
Affiliation:
Solid State Physics Laboratory, Delhi 110054, India
A. Kapoor
Affiliation:
Solid State Physics Laboratory, Delhi 110054, India
A. Mehra
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
T. Aernouts
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
J. Poortmans
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
R. Mertens
Affiliation:
IMEC, Kapeldreef 75, 3001 Leuven, Belgium
M. Willander
Affiliation:
Chalmers University of Technology, Department of Physics, S-41296 Gäteborg, Sweden
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Abstract

We have calculated J-V characteristics of an organic conducting sample (containing traps) including the Poole-Frenkel Effect (PFE). Both shallow and exponentially distributed traps are considered. We show that our approach is equivalent to combining the effect of trapping and using the field dependent mobility in one unified model. For shallow single level or shallow Gaussian traps, inclusion of PFE or using the (well-known) field dependent mobility gives the same dependence of current on voltage at a given temperature. However the value of zero field mobility µ0 comes out to be different. We have fabricated and measured the J-V curves of the ITO/MEH-OPV5/Al diodes. An extremely fast rise with voltage V is observed at small voltages, which can be interpreted either by the Schottky contact limited Shockley like current or by bulk space charge limited current with PFE. The correct mechanism can be determined by making J-V measurements at different temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C8.12
Copyright
Copyright © Materials Research Society 2001

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References

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