Constructing a new polymer acceptor enabled non-halogenated solvent-processed all-polymer solar cell with an efficiency of 13.8

A new polymer acceptor, PS1 , was developed by connecting the non-fullerene acceptor building block of dithienothiophen[3,2- b ]pyrrolobenzotriazole capped with 3-(dicyanomethylidene)-indan-1-one through a thiophene spacer. The solubilizing alkyl side groups in the central unit enabled PS1 to be readily dissolved in non-chlorinated solvents. By using 2-methyltetrahydrofuran as the processing solvent, the all-polymer solar cell (all-PSC) containing PS1 and a polymer donor PTzBI-oF in the light-harvesting layer exhibited an impressively high power conversion efficiency of 13.8%. The new polymer donor PS1 can be easily dissolved in a non-chlorinated solvent, and it exhibited a remarkable PCE when processed with 2-methyltetrahydrofuran.