High-Performance n-Type Organic Transistor with a Solution-Processed and Exfoliation-Transferred Two-Dimensional Crystalline Layered Film

High-performance n -type organic field-effect transistors (OFETs) based on 2-dimensional (2D) crystalline layered films of the novel dicyanodistyrylbenzene (DCS) derivative (2 Z,2′ Z )-3,3′-(1,4-phenylene)bis(2-(3,5-bis(trifluoromethyl)phenyl)acrylonitrile) (CN-TFPA) were fabricated using a simple solution process. The OFETs showed electron mobilities of up to 0.55 cm 2 V –1 s –1, which was attributed to the appropriate electron affinity and dense molecular packing in the well-ordered 2D terrace structure. Because of the easy exfoliation capabilities of the CN-TFPA 2D crystalline layers, 2–10 CN-TFPA molecular monolayers could be successfully transferred onto the substrates, enabling the fabrication of ultrathin OFET devices with an active layer thickness of ∼30 nm.