[19a-Z18-1~12] 12.4 Organic light-emitting devices and organic transistors

△ [19a-Z18-3] Phase Competition and Semiconducting Properties of Layered Organic Semiconductor Mixed System, PE-BTBT-(C_n/C_m)

〇(M1)Kiyoshi Nikaido¹, Satoru Inoue¹, Toshiki Higashino², Satoshi Matsuoka¹, Shunto Arai¹, Tatsuo Hasegawa¹ (1.U. Tokyo, 2.AIST)

Keywords:organic semiconductor, liquid crystal, organic transistor

PE-BTBT-C_n, organic semiconductors with phenyl ethynyl group and alkyl chain as substituents, show characteristic layered structures depending on their alkyl chain length. Especially, disordered layered structure is realized in n = 6, in which the long axes of molecules are not aligned. However, when mixed with n = 12, which shows bilayered herringbone structure (b-LHB), it is indicated from experimental results that the mixed components of n = 6 and n = 12 show b-LHB, and thermal properties are drastically changed. In addition to device characteristics of PE-BTBT-C_n, the correlation between the b-LHB and liquid crystalline phases will be discussed.