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Research Article

Tunability of Mobility and Conductivity over Large Ranges in Poly(3,3′′′-didodecylquaterthiophene)/Insulating Polymer Composites

J. Sun, B.-J. Jung, T. Lee, L. Berger, J. Huang, Y. Liu, D. H. Reich and H. E. Katz*

Department of Materials Science and Engineering, Johns Hopkins University, 103 Maryland Hall, 3400 North Charles Street, Baltimore, Maryland 21218

ACS Appl. Mater. Interfaces, 2009, 1 (2), pp 412–419

DOI: 10.1021/am8001132

Publication Date (Web): February 2, 2009

* E-mail: hekatz@jhu.edu.

Abstract

Semiconducting polymers are currently being considered as active layers in field-effect transistors, in which high charge carrier mobility and low off conductivity are important. For other applications, such as certain spintronic mechanisms, the opposite characteristics are desirable. Blending such polymers with insulating polymers would be expected to lower the mobility. In this paper, we report that the use of hydrocarbon polymers such as polystyrene as insulators generally raises the mobility when the semiconducting polymer is poly(bisdodecylquaterthiophene). A high mobility value of nearly 0.1 cm²/V·s was obtained for an optimal blend. While this is counterintuitive, it is consistent with a few other recent reports. In order to lower the mobility significantly, a much more polar and irregular blending agent is needed. The further addition of tetrafluorotetracyanoquinodimethane as a dopant gave a rare low mobility/high conductivity combination of properties, with a charge carrier density on the order of 10¹⁹ cm⁻³. Thus, mobility and conductivity were tuned somewhat independently over 3 and 4 orders of magnitude, respectively.

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History

Published In Issue February 25, 2009
Article ASAPFebruary 02, 2009
Received: October 12, 2008
Accepted: December 30, 2008

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Research Article

Tunability of Mobility and Conductivity over Large Ranges in Poly(3,3′′′-didodecylquaterthiophene)/Insulating Polymer Composites