From Event: SPIE Organic Photonics + Electronics, 2017
Thiophene-phenylene co-oligomers (TPCO) single crystals are promising materials for organic light-emitting devices, e.g., light-emitting transistors (OLETs), due to their ability to combine high luminescence and efficient charge transport. However, optical confinement in platy single crystals strongly decreases light emission from their top surface degrading the device performance. To avoid optical waveguiding, single crystals thinner than 100 nm would be beneficial. Herein, we report on solution-processed ultrathin single crystals of TPCO and study their charge transport properties. As materials we used 1,4-bis(5'-hexyl-2,2'-bithiophene-5-yl)benzene (DH-TTPTT) and 1,4-bis(5'-decyl-2,2'-bithiophene-5-yl)benzene (DD-TTPTT). The ultrathin single crystals were studied by optical polarization, atomic-force, and transmission electron microscopies, and as active layers in organic field effect transistors (OFET). The OFET hole mobility was increased tenfold for the oligomer with longer alkyl substituents (DD-TTPTT) reaching 0.2 cm2/Vs. Our studies of crystal growth indicate that if the substrate is wetted, it has no significant effect on the crystal growth. We conclude that solution-processed ultrathin TPCO single crystals are a promising platform for organic optoelectronic field-effect devices.
Anastasia V. Glushkova, Elena Yu. Poimanova, Vladimir V. Bruevich, Yuriy N. Luponosov, Sergei A. Ponomarenko, and Dmitry Yu. Paraschuk, "Ultrathin solution-processed single crystals of thiophene-phenylene co-oligomers for organic field-effect devices," Proc. SPIE 10365, Organic Field-Effect Transistors XVI, 1036504 (Presented at SPIE Organic Photonics + Electronics: August 07, 2017; Published: 25 August 2017); https://doi.org/10.1117/12.2273538.
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