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Proceedings Paper

Ink-jet printing of self-aligned soluble-pentacene crystals for high-performance organic field-effect transistors
Author(s): Jung Ah Lim; Wi Hyoung Lee; Yeong Don Park; Hwa Sung Lee; Kilwon Cho
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Paper Abstract

We have reported the fabrication of the self-organized 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS_PEN) crystals with highly ordered molecular structures by using evaporation-induced flows in a solution process. The one-dimensional microcrystal arrays of TIPS_PEN were fabricated by simple solution casting on a tilted substrate. By pinning a solution droplet on the tilted substrate, an array of ribbon-shaped crystals aligned in the tilted direction was formed on the substrate. In particular, self-aligned TIPS_PEN crystals with highly ordered crystalline structures via inkjet printing were successfully produced by controlling the evaporation-induced flow using solvent mixture, and arise when there is a recirculation flow in a inkjet printed droplet that is induced by a Marangoni flow (surface-tension-driven flow) in the direction opposite to the outward convective flow. The field-effect transistors fabricated with these self-aligned TIPS_PEN crystals via drop casting and inkjet printing exhibit significantly improved electrical performance. These results demonstrate that control of evaporation-induced flow in a solution process of organic semiconductor can be an excellent method for the production of organic semiconductor films with uniform morphology and desired molecular orientation for the direct-write fabrication of high-performance OFETs.

Paper Details

Date Published: 13 September 2007
PDF: 8 pages
Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665811 (13 September 2007); doi: 10.1117/12.732361
Show Author Affiliations
Jung Ah Lim, Pohang Univ. of Science and Technology (South Korea)
Wi Hyoung Lee, Pohang Univ. of Science and Technology (South Korea)
Yeong Don Park, Pohang Univ. of Science and Technology (South Korea)
Hwa Sung Lee, Pohang Univ. of Science and Technology (South Korea)
Kilwon Cho, Pohang Univ. of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 6658:
Organic Field-Effect Transistors VI
Zhenan Bao; David J. Gundlach, Editor(s)

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