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Proceedings Paper

All printed thin film transistors for flexible electronics
Author(s): Ana Claudia Arias; Jurgen Daniel; Sanjiv Sambandan; Tse Nga Ng; Beverly Russo; Brent Krusor; Robert A. Street
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Paper Abstract

Methods used to deposit and integrate solution-processed materials to fabricate thin film transistors by ink-jet printing are presented. We demonstrate successful integration of a complete additive process with the fabrication of simple prototype TFT backplanes on glass and on flexible plastic substrates, and we discuss the factors that make the process possible. Surface energy control of the gate dielectric layer allows printing of the metal source-drain contacts with gaps as small as 10 um as well as the polymer semiconductor whose electronic properties are very sensitive to surface energy. Silver nanoparticles are used as gate and data metals, and a polythiophene derivative (PQT-12) is used as the semiconducting layer, and the gate dielectric is a polymer. The maximum processing temperature used is 150°C, making the process compatible with flexible substrates. The ION/IOFF ratio is 105-106, and TFT mobilities of 0.05 cm2/Vs were obtained. The electrical stability of the all-printed transistors was compared to conventional fabrication methods and it is shown to be acceptable for array operation. Here we discuss the yield of the printing process and show arrays that are integrated with E-ink media to form flexible paper-like displays.

Paper Details

Date Published: 2 September 2008
PDF: 7 pages
Proc. SPIE 7054, Organic Field-Effect Transistors VII and Organic Semiconductors in Sensors and Bioelectronics, 70540L (2 September 2008); doi: 10.1117/12.795741
Show Author Affiliations
Ana Claudia Arias, Palo Alto Research Ctr. (United States)
Jurgen Daniel, Palo Alto Research Ctr. (United States)
Sanjiv Sambandan, Palo Alto Research Ctr. (United States)
Tse Nga Ng, Palo Alto Research Ctr. (United States)
Beverly Russo, Palo Alto Research Ctr. (United States)
Brent Krusor, Palo Alto Research Ctr. (United States)
Robert A. Street, Palo Alto Research Ctr. (United States)


Published in SPIE Proceedings Vol. 7054:
Organic Field-Effect Transistors VII and Organic Semiconductors in Sensors and Bioelectronics
Zhenan Bao; Iain McCulloch; Ruth Shinar, Editor(s)

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