Two compatible nonfullerene acceptors with similar structures as alloy for efficient ternary polymer solar cells

A new wide bandgap copolymer PSTZ was synthesized and applied for photovoltaic devices. The ternary non-fullerene PSCs based on PSTZ as donor and the alloy of two compatible nonfullerene acceptors ITIC and IDIC as acceptor exhibited superior photovoltaic performance with a PCE of 11.1%, under the illumination of AM 1.5 G, 100 mW cm−2.202