Enhanced ε r / L D and improved acceptor crystal growth enable all-polymer solar cells with outstanding efficiency, stability, and processability from a chlorinated-dimer diluent additive

A chlorinated dimer acceptor (D-SeV-Cl) was designed as a diluent additive for PM6:PYT. Blade-coated all-PSCs using a green solvent achieved a device efficiency PCE exceeding 20%with excellent stability and processability.