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Anisotropies in the electrical properties of rod-like aggregates of liquid crystalline phthalocyanines: Direct current conductivities and field-effect mobilities

Published online by Cambridge University Press:  03 March 2011

Carrie L. Donley ,
R.A.P. Zangmeister ,
Wei Xia ,
Britt Minch ,
Anthony Drager ,
Samir K. Cherian ,
Lynn LaRussa ,
Bernard Kippelen ,
Benoit Domercq  and
David L. Mathine
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Carrie L. Donley
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Wei Xia
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Britt Minch
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Anthony Drager
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Samir K. Cherian
Affiliation:
Department of Optical Sciences and Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721
Lynn LaRussa
Affiliation:
Department of Optical Sciences and Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721
Bernard Kippelen
Affiliation:
Department of Optical Sciences and Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721
Benoit Domercq
Affiliation:
Department of Optical Sciences and Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721
David L. Mathine*
Affiliation:
Department of Optical Sciences and Department of Electrical and Computer Engineering, University of Arizona, Tucson, Arizona 85721
David F. O’Brien
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
Neal R. Armstrong*
Affiliation:
Department of Chemistry, University of Arizona, Tucson, Arizona 85721
*
d)Address all correspondence to these authors. e-mail: nrau@arizona.edu
d)Address all correspondence to these authors. e-mail: nrau@arizona.edu
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Abstract

The direct current (dc) conductivities and organic field-effect transistor (OFET) characteristics of a class of octa-substituted liquid crystalline (discotic mesophase) phthalocyanines (Pcs) are discussed. These molecules self-organize into columnar aggregates with large coherence lengths (up to approximately 300 nm). Langmuir–Blodgett films of these molecules were horizontally transferred to either interdigitated microelectrodes (IME) or OFET substrates, so that current flow could be measured either parallel or perpendicular to the column axis. Twenty-eight bilayer films of these Pcs on the IME substrates showed anisotropies in dc conductivity up to 50:1, whereas similar Pc films showed anisotropies in field effect mobilities of approximately 10:1, for a variety of W/L ratios (source/drain dimensions and spacing). Field-effect mobilities of 1 to 5 × 10-6 cm2·V-1·s-1 were determined from OFET measurements, along the Pc column axis, whereas charge mobilities measured from the space charge limited current regime on the IME substrates were in the range of 10-4 cm2·V-1·s-1. Conductive tip atomic force microscopy measurements on the apprximately 500-nm length scale showed that the conductivity anisotropy can be as high as 1000:1 when the Pc columns are intimately contacted to an adjacent Au bond pad.

Keywords

Electrical propertiesOrganicSelf-assembly
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 7 , July 2004 , pp. 2087 - 2099
Copyright
Copyright © Materials Research Society 2004

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