High‐Mobility n‐Type Organic Transistors Based on a Crystallized Diketopyrrolopyrrole Derivative |
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Authors: | Won Sik Yoon Sang Kyu Park Illhun Cho Jeong‐A Oh Jong H Kim Soo Young Park |
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Affiliation: | Center for Suprameolcular Optoelectronic, Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak‐ro, Gwanak‐gu, Seoul 151‐744, Korea |
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Abstract: | A new high‐performing small molecule n‐channel semiconductor based on diketopyrrolopyrrole (DPP), 2,2′‐(5,5′‐(2,5‐bis(2‐ethylhexyl)‐3,6‐dioxo‐2,3,5,6‐tetrahydropyrrolo3,4‐c]pyrrole‐1,4‐diyl)bis(thiophene‐5,2‐diyl))bis(methan‐1‐yl‐1‐ylidene)dimalononitrile (DPP‐T‐DCV), is successfully synthesized. The frontier molecular orbitals in this designed structure are elaborately tuned by introducing a strong electron‐accepting functionality (dicyanovinyl). The well‐defined lamellar structures of the crystals display a uniform terrace step height corresponding to a molecular monolayer in the solid‐state. As a result of this tuning and the remarkable crystallinity derived from the conformational planarity, organic field‐effect transistors (OFETs) based on dense‐packed solution‐processed single‐crystals of DPP‐T‐DCV exhibit an electron mobility (μe) up to 0.96 cm2 V?1 s?1, one of the highest values yet obtained for DPP derivative‐based n‐channel OFETs. Polycrystalline OFETs show promise (with an μe up to 0.64 cm2 V?1 s?1) for practical utility in organic device applications. |
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Keywords: | diketopyrrolopyrrole dicyanovinyl substitution n‐channel semiconductors single‐crystalline organic field‐effect transistors |
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