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Proceedings Paper

The influence of molecular weight on the microstructure and thin film transistor characteristics of pBTTT polymers.
Author(s): Rick Hamilton; Clare Bailey; Warren Duffy; Martin Heeney; Maxim Shkunov; David Sparrowe; Steve Tierney; Iain McCulloch; R. Joseph Kline; Dean M. DeLongchamp; Michael Chabinyc
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Paper Abstract

A common strategy to improve the electrical performance of organic field effect transistors is to optimize the charge carrier mobility of the semiconducting thin film. Polymer semiconductor transport properties have shown a dependence on the chain length, due principally to the strong influence of molecular weight on the thin film microstructure. In this work, we report on a study of the influence of increasing molecular weight of poly(2,5-bis(3-docecylthiophen-2-yl)thieno[3,2-b]thiophenes) (pBTTT-C12) on the polymer bulk thermal properties, thin film microstructure and the electrical performance of thin film field effect transistor devices. Clear differences can be observed within a number average molecular weight range of 8,000 - 18,000 Dalton. A Liquid crystalline phase was only observed at the highest molecular weight, different thin film morphology was observed within the molecular weight range, and the field effect mobility was shown to increase with increasing molecular weight.

Paper Details

Date Published: 25 August 2006
PDF: 6 pages
Proc. SPIE 6336, Organic Field-Effect Transistors V, 633611 (25 August 2006); doi: 10.1117/12.682874
Show Author Affiliations
Rick Hamilton, Merck Chemicals (United Kingdom)
Clare Bailey, Merck Chemicals (United Kingdom)
Warren Duffy, Merck Chemicals (United Kingdom)
Martin Heeney, Merck Chemicals (United Kingdom)
Maxim Shkunov, Merck Chemicals (United Kingdom)
David Sparrowe, Merck Chemicals (United Kingdom)
Steve Tierney, Merck Chemicals (United Kingdom)
Iain McCulloch, Merck Chemicals (United Kingdom)
R. Joseph Kline, National Institute of Standards and Technology (United States)
Dean M. DeLongchamp, National Institute of Standards and Technology (United States)
Michael Chabinyc, Palo Alto Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6336:
Organic Field-Effect Transistors V
Zhenan Bao; David J. Gundlach, Editor(s)

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