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The Impact of Capping on the Mobility and Thermal Stability of Organic Thin Film Transistors

Published online by Cambridge University Press:  26 February 2011

Stephan Meyer ,
Stefan Sellner ,
Frank Schreiber ,
Helmut Dosch ,
Gerhard Ulbricht ,
Matthias Fischer ,
Bruno Gompf  and
Jens Pflaum
Stephan Meyer
Affiliation:
s.meyer@physik.uni-stuttgart.de, University of Stuttgart, 3. Physics Institute, Pfaffenwaldring 57, Stuttgart, 70550, Germany
Stefan Sellner
Affiliation:
ssellner@deas.harvard.edu, Harvard University, Division of Engineering and Applied Sciences, Cambridge, MA, 02138, United States
Frank Schreiber
Affiliation:
frank.schreiber@uni-tuebingen.de, University of Tübingen, Institute of Applied Physics, Tübingen, 72076, Germany
Helmut Dosch
Affiliation:
dosch@mf.mpg.de, Max-Planck-Institute, Stuttgart, 70569, Germany
Gerhard Ulbricht
Affiliation:
G.Ulbricht@fkf.mpg.de, Max-Planck-Institute, Stuttgart, 70569, Germany
Matthias Fischer
Affiliation:
fischer@pi1.physik.uni-stuttgart.de, University of Stuttgart, 1st Physics Institute, Stuttgart, 70550, Germany
Bruno Gompf
Affiliation:
gompf@pi1.physik.uni-stuttgart.de, University of Stuttgart, 1st Physics Institute, Stuttgart, 70550, Germany
Jens Pflaum
Affiliation:
j.pflaum@physik.uni-stuttgart.de, University of Stuttgart, 3rd Physics Institute, Stuttgart, 70550, Germany
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Abstract

We performed temperature-dependent studies on pentacene thin film transistors (TFTs) with and without encapsulation. The capping layer is realized either by a sputtering layer of aluminum oxide (AlOx.) or, alternatively, by a polymeric layer of poly-para-xylylene (PPX). A field-effect can be demonstrated for both capping materials up to temperatures of about 140 – 170 °C, which is about 50 °C above the desorption point of uncapped pentacene thin films on SiO2 substrates. Complementary studies by thermal desorption spectroscopy and temperature dependent x-ray diffraction show that the organic layer remains crystalline on the substrate far above the electrical breakdown temperature of the encapsulated device.

Keywords

organicthin filmdevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 965: Symposium S – Organic Electronics – Materials, Devices and Applications , 2006 , 0965-S06-13
Copyright
Copyright © Materials Research Society 2007

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References

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