Abstract

Regulating the crystallization of donor and acceptor to maintain balanced carrier mobility is of great importance to fabricate efficient organic solar cells (OSCs). Herein, the balanced crystallinity between donor and acceptor was finely controlled in blade-coated OSCs. By adding high crystalline FOIC into PBDB-T:ITIC system, a balanced carrier mobility was achieved, resulting in the much improved fill factor. The optimized ternary device exhibits an increased current density, due to the enhanced light-harvesting efficiency with complementary absorption and the morphology change. Morphology characterization demonstrated that the ternary film exhibits a highly balanced crystallinity between the donor and acceptor on account of the formation of acceptor alloy. Moreover, the ternary film not only possesses a small domain size, but also exhibits a high domain purity as compared to both binary films. Encouragingly, a highest power conversion efficiency (PCE) of 10.68% was obtained for the blade-coated ternary OSCs. In addition, the blade-coated flexible large-area (105 mm 2 ) OSC based on PBDB-T:ITIC:FOIC ternary system also exhibits a high PCE of 9.81%, showing great potential in the high-throughput fabrication of OSCs. The crystallization was finely regulated by ternary strategy to balance the carrier mobility in blade-coated flexible organic solar cells. • The crystallization was finely regulated in blade-coated OSCs by adding high crystalline FOIC into PBDB-T:ITIC system. • High PCE of 10.68% with excellent fill factor (69.8%) was achieved for the blade-coated PBDB-T:ITIC:FOIC device. • Large-area (105 mm 2 ) flexible device was fabricated by blade-coating in air, and exhibits a high PCE of 9.81%.

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