Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesi...Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesized with chlorinated and fluorinated aromatic side chains,respectively,which contributed to distinct noncovalent interactions.Compared with the PM 6:L 8-BO host system,the TPQ-2 F-2 Cl based ternary OSCs obtained enhanced exciton dissociation and more balanced carrier mobility.Moreover,benefiting from the favorable miscibility of the PM 6:L 8-BO:TPQ-2 F-2 Cl blend,the ternary blending film featured a well-defined fibrillar morphology and improved molecular ordering.Consequently,the optimal PM 6:L 8-BO:TPQ-2 F-2 Cl device achieved a more outstanding PCE of 18.2%,a higher open circuit voltage(V_(oc)),and a better fill factor(FF)in comparison with the binary device(PCE=17.7%).In contrast,the addition of TPQ-2 F-4 F would generate excessive aggregation of blend,thereby reducing the PCE of ternary OSCs(16.0%).This work shows a promising idea for designing efficient third component donor polymers.展开更多
基金Projects(52125306,21875286)supported by the National Natural Science Foundation of China。
文摘Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesized with chlorinated and fluorinated aromatic side chains,respectively,which contributed to distinct noncovalent interactions.Compared with the PM 6:L 8-BO host system,the TPQ-2 F-2 Cl based ternary OSCs obtained enhanced exciton dissociation and more balanced carrier mobility.Moreover,benefiting from the favorable miscibility of the PM 6:L 8-BO:TPQ-2 F-2 Cl blend,the ternary blending film featured a well-defined fibrillar morphology and improved molecular ordering.Consequently,the optimal PM 6:L 8-BO:TPQ-2 F-2 Cl device achieved a more outstanding PCE of 18.2%,a higher open circuit voltage(V_(oc)),and a better fill factor(FF)in comparison with the binary device(PCE=17.7%).In contrast,the addition of TPQ-2 F-4 F would generate excessive aggregation of blend,thereby reducing the PCE of ternary OSCs(16.0%).This work shows a promising idea for designing efficient third component donor polymers.
