13 September 2007 Ink-jet printing of self-aligned soluble-pentacene crystals for high-performance organic field-effect transistors
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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.
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Jung Ah Lim, Wi Hyoung Lee, Yeong Don Park, Hwa Sung Lee, Kilwon Cho, "Ink-jet printing of self-aligned soluble-pentacene crystals for high-performance organic field-effect transistors", Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665811 (13 September 2007); doi: 10.1117/12.732361; https://doi.org/10.1117/12.732361

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