Chlorination of dithienobenzodithiophene (DTBDT) based polymers to simultaneously improve the VOC, JSC and FF of non-fullerene organic solar cells

Two donor–π–acceptor polymers (PE64 and PE65) with dithienobenzodithiophene (DTBDT) as the electron-donating unit and quinoxaline as the electron-accepting unit were designed to extend the application of DTBDT in non-fullerene organic solar cells.