Diindeno[1,2-g:1′,2′-s]rubicene: all-carbon non-fullerene electron acceptor for efficient bulk-heterojunction organic solar cells with high open-circuit voltage

An all carbon non-fullerene electron acceptor material based on diindeno[1,2-g: 1 ',2 '-s]rubicene (DIR) was readily synthesized and processed for bulk-heterojunction organic solar cells. High PCE up to 3.05% with a relatively high V-OC of 1.22 V has been achieved with P3HT electron donor material by the variation of donor-acceptor blending ratio.