[20a-B104-1~11] 12.4 Organic light-emitting devices and organic transistors

△ [20a-B104-6] Tuning Carrier Transport Properties in Thin-Film Transistor through Mixing-Induced Polymorphic Phase Control in Layered Organic Semiconductors

〇(D)Kiyoshi Nikaido¹, Satoru Inoue¹, Seiji Tsuzuki¹, Reiji Kumai², Shunto Arai¹, Tatsuo Hasegawa¹ (1.U. Tokyo, 2.IMSS KEK)

Keywords:organic semiconductors, crystal structure, thin-film transistors

Crystal structure of organic semiconductors is crucial for obtaining high-performance organic thin-film transistors (TFTs). Here we report the mixing-induced control of polymorphic phases in the mixture of pTol-BTBT-C₆ and -C₈ which are recently-developed layered organic semiconductors. While the pristine pTol-BTBT-C₆ and -C₈ exhibit field-effect mobility of 1 cm²/Vs, the equimolar mixture exhibits mobility of 10 cm²/Vs in single crystalline TFTs. The observed mobility is strongly correlated with the structural change induced by mixing molecules.