Efficient Synthesis of High-Molecular-Weight Crosslinkable Donor—Acceptor Copolymers with High Yield via Post-Polymerization Modification
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Crosslinked organic semiconductors have opened a way for various fabrication techniques in the field of organic electronics, owing to its three-dimensional network structure with high solvent resistivity. However, recent efforts for synthesizing intrinsically crosslinkable semiconducting polymer have been limited by the low molecular weight and yield. In this work, the limitation is overcome by a novel synthetic strategy, post-polymerization modification. (3-mercaptopropyl)trimethoxysilane is attached to a diketopyrrolopyrrole (DPP)-based donor-acceptor copolymer (DPPTT) via thioesterification and para-fluoro-thiol reaction. The use of click chemistry enables high yield without any purification. The modified DPPTT (Cx-DPPTT) demonstrates high resistance to organic solvents . Exploiting the benefit, ultrathin flexible array of 100 organic field effect transistors fabricated with the conventional photolithography shows high reliability in performance.