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Polyfluorenes as Organic Semiconductors for Polymeric Field Effect Transistors

Published online by Cambridge University Press:  15 February 2011

David J. Brennan ,
Paul H. Townsend ,
Dean M. Welsh ,
Mitchell G. Dibbs ,
Jeff M. Shaw ,
Jessica L. Miklovich  and
Robyn B. Boeke
David J. Brennan
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Paul H. Townsend
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Dean M. Welsh
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Mitchell G. Dibbs
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Jeff M. Shaw
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Jessica L. Miklovich
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
Robyn B. Boeke
Affiliation:
The Dow Chemical Company, Advanced Electronic Materials, Midland, Michigan, USA, 48674.
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Extract

Polyfluorenes are a class of polyaromatic macromolecules that are characterized by an alternating backbone structure that consists of a 9,9-dialkylfluorene unit in combination with another aromatic group. The nature of this aromatic unit plays a key role in the electronic properties of the polymers. For example, polyfluorenes which combine chromophoric and charge transporting aromatic units have received a great deal of attention over the last several years as the emissive layer in polymeric light emitting diodes [LUMATION* Light-Emitting Polymers (LEPs)]. More recently, polyfluorenes have also been designed to perform as the organic semiconducting layer in polymeric field effect transistors (PFETs). This effort has led to a class of polymeric semiconductors with an excellent combination of charge mobility, environmental stability, and processability. One such polymer is the polyfluorene based on an alternating backbone of 9,9-dioctylfluorene and 2,2'-bithiophene units. This material has been shown to have charge mobilities as high as 0.02 cm2/V-s with current on/off ratios of up to 106. The poly(fluorene-bithiophene) is more resistant to doping by atmospheric oxygen than other polymeric semiconductors such as poly(3-hexylthiophene). Inks based on solutions of poly(fluorene-bithiophene) in xylene, mesitylene, and other solvents have also been prepared. The paper will focus on the recent advances in the synthesis, fabrication, and electrical characterization of poly(fluorene-bithiophene). *Trademark of The Dow Chemical Company

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L6.1
Copyright
Copyright © Materials Research Society 2003

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