Semiconductive Single Molecular Bilayers: a New Platform for High-Performance Organic Transistors

摘要

We have developed a solution-based method to produce ultrathin organic semiconductor layers of single molecular bilayer thickness. We used rod-like organic semiconductors composed of an extended π-conjugated framework asymmetrically substituted by an alkyl chain (πCore-Cns). To suppress multilayer crystallization while maintaining the intralayer molecular ordering, geometrical frustration was induced using chain-length disorder. Blade-coating of a solution containing two kinds of molecules with different alkyl chain lengths (i.e. πCore-Cn and πCore-Cm (n < m)) successfully yielded single molecular bilayers (SMBs). This allowed us to fabricate uniform, stable, and large-scale films compared with other conventional self-assembly processes. The fabricated organic thin-film transistors produced using SMBs exhibit efficient two-dimensional carrier transport. This finding should open new ways to produce SMB-based ultrathin super-flexible electronics.