It has recently been shown how the injection barriers at the electrode interfaces and the built-in voltage (Vbi) of organic light emitting diodes can be obtained from measurements of the differential capacitance at low frequencies, using the voltage and height of a distinct peak in the capacitance-voltages curves. In this paper, we investigate the effects of Gaussian energetic disorder on the analysis, for single-carrier and double-carrier devices. We show how the disorder affects the peak position and height, and how from combined capacitance-voltage measurements and device modeling the injection barriers and Vbi can be determined. As examples, hole-only and double-carrier devices are investigated based on a blue-emitting polyfluorene-triarylamine copolymer.
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1 April 2012
Research Article|
April 06 2012
Effects of energetic disorder on the low-frequency differential capacitance of organic light emitting diodes
W. C. Germs;
W. C. Germs
a)
1Molecular Materials and Nanosystems, Department of Applied Physics,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Philips Research Laboratories
, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
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S. L. M. van Mensfoort;
S. L. M. van Mensfoort
1Molecular Materials and Nanosystems, Department of Applied Physics,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Philips Research Laboratories
, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
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R. J. de Vries;
R. J. de Vries
1Molecular Materials and Nanosystems, Department of Applied Physics,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Philips Research Laboratories
, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
3
Dutch Polymer Institute (DPI)
, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
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R. Coehoorn
R. Coehoorn
1Molecular Materials and Nanosystems, Department of Applied Physics,
Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Philips Research Laboratories
, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands
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a)
Electronic mail: w.c.germs@tue.nl.
J. Appl. Phys. 111, 074506 (2012)
Article history
Received:
November 04 2011
Accepted:
February 20 2012
Citation
W. C. Germs, S. L. M. van Mensfoort, R. J. de Vries, R. Coehoorn; Effects of energetic disorder on the low-frequency differential capacitance of organic light emitting diodes. J. Appl. Phys. 1 April 2012; 111 (7): 074506. https://doi.org/10.1063/1.3701575
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