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Field-Effect Mobility and Morphology Study in Amorphous Films of Symmetric and Unsymmetrical Spiro-Linked Compounds

Published online by Cambridge University Press:  01 February 2011

Tobat P. I. Saragi ,
Robert Pudzich ,
Thomas Fuhrmann  and
Josef Salbeck
Tobat P. I. Saragi
Affiliation:
Macromolecular Chemistry and Molecular Materials Department of Physics, University of Kassel Heinrich-Plett-Strasse 40, D 34109 Kassel, Germany
Robert Pudzich
Affiliation:
Macromolecular Chemistry and Molecular Materials Department of Physics, University of Kassel Heinrich-Plett-Strasse 40, D 34109 Kassel, Germany
Thomas Fuhrmann
Affiliation:
Macromolecular Chemistry and Molecular Materials Department of Physics, University of Kassel Heinrich-Plett-Strasse 40, D 34109 Kassel, Germany
Josef Salbeck
Affiliation:
Macromolecular Chemistry and Molecular Materials Department of Physics, University of Kassel Heinrich-Plett-Strasse 40, D 34109 Kassel, Germany
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Abstract

We have investigated the field-effect mobility of three kinds of low molecular weight spirolinked compounds, namely 2,2',7,7'-tetrakis (diphenylamino)-9,9'-spirobifluorene (spiro-TAD), 2,2',7,7'-tetrakis(biphenyl-4-yl)-9,9'-spirobifluorene (spiro-6φ) and 2,7-bis-(N,N-diphenylamino)- 2',7'-bis-(biphenyl-4-yl)-9,9'-spirobifluorene (spiro-X2). The field-effect mobilities of these materials in the saturation region are 8 x 10-4 cm2V-1s-1, 5 x 10-5 cm2V-1s-1 and 4 x 10-4 cm2V-1s-1 respectively. The atomic force microscopy images show that films prepared from these materials are amorphous with a very smooth surface and the limited field-effect mobility is due to the intrinsic behaviour of amorphous materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 725: Symposium P – Organic and Polymeric Materials and Devices-Optical, Electrical, and Optoelectronic Properties , 2002 , P10.10
Copyright
Copyright © Materials Research Society 2002

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