Efficient and Scalable Large-Area Organic Solar Cells Using Cyano Group-Introduced Asymmetric Non-Fullerene Acceptors and Copolymer Donor
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초록
내용
Despite the high power conversion efficiency (PCE) of the small-area organic solar cells (OSCs), the PCE of large-area OSCs for commercialization is still lag behind. Main factor of low PCE of large-area OSCs is the aggregation of the materials in the photoactive layer. Herein, we synthesize two asymmetric non-fullerene acceptors (NFAs), IPC1CN-BBO-IC2F and IPC1CN-BBO-IC2Cl. Additionally, we synthesize a random copolymer PM6-PBDBT(55) to optimally match its energy level with those of these NFAs. The aggregation in the photoactive layer is inhibited by controlling the miscibility between polymer donor and NFAs, resulting in the uniform photoactive layer. Especially, the blade-coated 1cm2-area OSCs based on PM6-PBDBT(55):IPC1CN-BBO-IC2Cl perform a PCE of 14.12%. Importantly, the large-area (58.50 cm2) modules based on PM6-PBDBT(55):IPC1CN-BBO-IC2Cl exhibit an impressive PCE of 11.28% and scalability retaining 80% of the PCE of its 1cm2-area OSCs with a small cell-to-module loss in fill factor.