An unfused-ring acceptor with high side-chain economy enabling 11.17% as-cast organic solar cells

Dibenzo[c,g]carbazole cored unfused-ring acceptor (DCB-4F) is designed with low weight ratio of side chains. Its as-cast OSCs with PM6 deliver 9.56% PCE with a V_OC of 1.00 V. By adding 10 wt% PC₇₁BM, 11.17% PCE is readily achieved. The blends show homogeneous nano-fibrous morphology.