[23p-E206-1~13] 12.4 Organic light-emitting devices and organic transistors

[23p-E206-9] Effects of Chalcogen Atoms on Crystal Structure and Transport Properties of Merhylchalcogenated Pyrenes

〇Kirill Dmitrievich Bulgarevich¹, Kazuo Takimiya^1,2,3, Takuya Ogaki¹, Shingo Horiuchi^1,2 (1.RIKEN, 2.Tohoku Univ., 3.AIMR Tohoku Univ.)

Keywords:Single-crystal OFETs, Crystal-structure control, Brickwork structure

We have recently reported that 1,3,6,8-tetrakis(methylthio)pyrene (MT-pyrene), crystallizes into a new type of the brickwork structure and shows high carrier mobility. Here, a systematic study was performed on the effect of other methylchalcogeno substitution of pyrene on the crystal structure and transport properties. Changing the sulfur atoms of MT-pyrene to oxygen and selenium (MO- and MS-pyrene, respectively) resulted in closely related brickwork structures, but with rather poor charge transport properties compared to MT-pyrene. In the presentation, I will discuss the subtle differences in molecular and crystal structures of these materials and effects of these differences on the charge transport properties.