Battery Drivable Organic Single‐Crystalline Transistors Based on Surface Grafting Ultrathin Polymer Dielectric

High‐performance and battery drivable organic single‐crystalline transistors with operational voltages ≤ 2.0 V are demonstrated using high‐quality copper phthalocyanine (CuPc) single‐crystalline nanoribbons and ultrathin polymer nanodielectrics. The ultrathin polymer nanodielectric is synthesized by grafting a ca. 10 nm poly(methyl methacrylate) (PMMA) brush on a silicon surface via surface‐initiated atom‐transfer radical polymerization (SI‐ATRP). This surface‐grafted nanodielectric exhibits a large capacitance, excellent insulating property, and good compatibility with organic semiconductors. The realization of a low operational voltage for battery driving at high performance, together with the merits of surface grafting of a nanodielectric, as well as the mechanical flexibility of the organic nanoribbon, suggests a bright future for use of these transistors in low‐cost and flexible circuits.