Pyradinodithiazole: An Electron-Accepting Monomer Unit for Hole-Transporting and Electron-Transporting Conjugated Copolymers

Pyradinodithiazole (<b>PDTz</b>) was designed as a new electron-accepting unit. The physical property measurements indicated that the <b>PDTz</b> unit has stronger electron-accepting characteristics than thiazolothiazole and benzodithiazole. A donor–acceptor copolymer containing <b>PDTz</b> as an acceptor unit was synthesized for hole-transporting semiconductors in organic photovoltaics (OPV). Furthermore, an acceptor–acceptor copolymer containing <b>PDTz</b> has also been developed for electron-transporting OPV materials. These copolymer-based blend films showed expected photovoltaic characteristics in individual OPV devices