Transistor Paint: High Mobilities in Small Bandgap Polymer Semiconductor Based on the Strong Acceptor, Diketopyrrolopyrrole and Strong Donor, Dithienopyrrole

摘要

Plastic electronics based on organic semiconductors attract considerable attention due to the promise of low cost, lightweight, and flexible large area electronic devices such as organic field effect transistors (OFETs), organic photovoltaics (OPVs), electrochromic devices, and organic light emitting diodes (OLEDs). Of the semiconductors, regioregular poly(3-alkylthiophenes) rr-P3ATs are the most studied and researched material. This is predominately due to the development of Grignard Metathesis (GRIM) that provides the facile synthesis of structurally pure rr-P3AT with narrow polydisperities. The pristine rr-P3ATs are known to form into a nanofibrillar morphology promoted by the pi-stacked polymer backbone and lamellar packing of the alkyl side chain. It is postulated that this morphology is the reason for its high charge mobility (～0.1 cm~2/Vs).