Solution-printed organic semiconductors have emerged in recent years as promising contenders for roll-to-roll manufacturing of electronic and optoelectronic circuits. The stringent performance requirements for organic thin-film transistors (OTFTs) in terms of carrier mobility, switching speed, turn-on voltage and uniformity over large areas require performance currently achieved by organic single-crystal devices, but these suffer from scale-up challenges. Here we present a new method based on blade coating of a blend of conjugated small molecules and amorphous insulating polymers to produce OTFTs with consistently excellent performance characteristics (carrier mobility as high as 6.7 cm2V−1s−1, low threshold voltages of <1V and low sub threshold swings <0.5Vdec−1). Our findings demonstrate that careful control over phase separation and crystallization can yield solution-printed polycrystalline organic semiconductor films with transport properties and other figures of merit on par with their single-crystal counterparts.
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This work was supported by the Office of Competitive Research Funds under the Competitive Research Grant (round 1) and Academic Excellence Alliance (round 3). CHESS was supported by the NSF & NIH/NIGMS via NSF award DMR-1332208. A.A. is grateful to SABIC for the Career Development SABIC Chair.
Niazi, Muhammad R.; Li, Ruipeng; Li, Er Qiang; Kirmani, Ahmad R.; Abdelsamie, Maged; Wang, Qingxiao; Pan, Wenyang; Payne, Marcia M.; Anthony, John E.; Smilgies, Detlef-M.; Thoroddsen, Sigurdur T.; Giannelis, Emmanuel P.; and Amassian, Aram, "Solution-Printed Organic Semiconductor Blends Exhibiting Transport Properties on Par with Single Crystals" (2015). Chemistry Faculty Publications. 68.