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17 November 2003 Polyfluorenes as organic semiconductors for polymeric field effect transistors
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Well-characterized F8T2 polyfluorene (Dow Chemical) has been prepared with weight average molecular weights (Mw) ranging from about 20,000 to 120,000. This semiconducting polymer has been used by Plastic Logic to fabricate arrays of 4,800 thin film transistors (TFTs) with 50 dpi, to be used as backplanes for active matrix displays. In this paper, the effects that molecular weight and thermal treatment have on the electrical characteristics of F8T2-based TFTs are reported. First, transistor performance improves with increasing molecular weight, with maximum values of TFT mobility approaching 1x 10-2 cm2 /V-s. Consistently higher mobilities are obtained when the F8T2 semiconductor makes contact with PEDOT/PSS versus gold electrodes. Alignment of F8T2 on a rubbed polyimide substrate is maintained after quenching, as determined by measurement of the dichroic ratios. Early-stage results on the development of inks based on F8T2 polyfluorene are also reported.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David J. Brennan, Paul H. Townsend III, Dean M. Welsh, Mitchell G. Dibbs, Jeff M. Shaw, Jessica L. Miklovich, Robyn B. Boeke, Ana Claudia Arias, Lisa Creswell, J. Devin MacKenzie, Catherine Ramsdale, Anoop Menon, and Henning Sirringhaus "Polyfluorenes as organic semiconductors for polymeric field effect transistors", Proc. SPIE 5217, Organic Field Effect Transistors II, (17 November 2003);

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