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BTP-4F-12 is an analog to Y6 with longer alkyl chains on its pyrrole rings. This imparts improved solubility to BTP-4F-12, meaning it can be solubilized in non-halogenated solvents such as o-xylene, TMB and THF. Its performance in organic solar cells remain among the best, reaching high PCEs up to 16.4% when used with the donor polymer T1 (Analog properties to PBDB-T-2F ).

Hong, L.; Yao, H.; Wu, Z.; Cui, Y.; Zhang, T.; Xu, Y.; Yu, R.; Liao, Q.; Gao, B.; Xian, K.; Woo, H. Y.; Ge, Z.; Hou, J., Eco-Compatible Solvent-Processed Organic Photovoltaic Cells with Over 16% Efficiency. Adv. Mater. 2019, 31 (39), 1903441

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