Materials science of layered organic semiconductors and formation of large-scale ultrathin single molecular bilayer films

Abstract

Production and control of 2D self-organized layers of π-conjugated molecules is a fundamental issue in organic electronics devices. The layered crystallinity is particularly important in the organic semiconductors (OSCs) because it allows to produce aligned molecular layers interfaced with gate dielectric layers, and thus, to obtain high-performance organic thin-film transistors. Recently, it was demonstrated that the layered crystallinity is considerably enhanced by the asymmetric substitution of the π-electron cores with relatively long alkyl chains. Here, we introduce our recent studies on the thin-film morphology control of these layered OSCs, and the stability of molecular packing motifs of the fabricated films.