[17a-M_123-1~12] 12.4 Organic light-emitting devices, organic transistors, and flexible devices

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[17a-M_123-8] Significant Change of Crystal Structure Induced by Heteroatom Substitution: Crystal Structure and OFET Properties of Methylchalcogeno-Diazapyrenes

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

Keywords:

Single-Crystal Organic Field-Effect Transistors,Crystal Structure Control,Brickwork Structure

The properties of organic semiconductors strongly depend on intermolecular orbital overlap in the crystal structure. Methylthio-substituted pyrene forms a brickwork (BW) packing with a two-dimensional π-stacking motif and exhibits an ultrahigh OFET mobility of 30 cm² V^-1 s^-1. In this study, we synthesized 2,7-diaza analogues, MT/MS-azapyrene, and found that their crystal structures become strongly one-dimensional, accompanied by a reduced mobility of less than 0.1 cm² V^-1 s^-1. We will discuss the factors driving this structural transformation.