High hole mobility in room temperature discotic liquid crystalline tetrathienoanthracenes

Abstract

Tetrathienoanthracene (TTA), a new discotic core fragment, is explored that shows a remarkably high hole mobility (μh) of 4.22 cm2 V−1 s−1 at room temperature when used in space-charge limited current (SCLC) devices. Strong co-facial interactions (π–π, S⋯S) among TTA cores along with a high tendency of the derivative to align homeotropically in the columnar mesophase over a large area in SCLC cells contributed to the top-class charge carrier mobility.