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Influence of Mechanical Rubbing of Polyhexylthiophene Layers on the Field-Effect Mobility using Differently Treated Isolator Surfaces

Published online by Cambridge University Press:  11 February 2011

H. Heil ,
T. Finnberg ,
R. Schmechel  and
H. von Seggern
H. Heil
Affiliation:
Institute of Materials and Geo Science, Darmstadt University of Technology, D-64287 Darmstadt, Germany.
T. Finnberg
Affiliation:
Institute of Materials and Geo Science, Darmstadt University of Technology, D-64287 Darmstadt, Germany.
R. Schmechel
Affiliation:
Institute of Materials and Geo Science, Darmstadt University of Technology, D-64287 Darmstadt, Germany.
H. von Seggern
Affiliation:
Institute of Materials and Geo Science, Darmstadt University of Technology, D-64287 Darmstadt, Germany.
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Abstract

This paper reports on the influence of the field-effect mobility of transistors based on regioregular head-to-tail coupled poly (3-hexylthiophene) by mechanically induced alignment on differently treated insulator surfaces. It is demonstrated that on hydrophilic insulator surfaces mechanical rubbing of the polyhexylthiophene layers perpendicular to the source drain contacts can increase the field-effect mobility whereas rubbing parallel to the source drain contacts results in a reduced mobility. In contrast it is shown that in transistors with a hydrophobic insulator surfaces, which show much higher mobilities no further improvement can be achieved. The rubbing induced polymer alignment is deduced from optically polarized transmission spectroscopy on polymer-coated quartz glass substrates. The different behavior of the field-effect mobility will be explained in terms of different degrees of crystallinity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 734: Symposia A/B – Defect-Mediated Phenomena in Ordered Polymers – Polymer/Metal Interfaces and Defect Mediated Phenomena in Ordered Polymers , 2002 , B9.9
Copyright
Copyright © Materials Research Society 2003

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References

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