Ternary strategy is a convenient and effective method to boost the performance of polymer solar cells(PSCs).Utilizing a ternary strategy to trade-off between the energy loss and the efficiency of devices how-ever requires further exploration.Here,through the hydroxyl(-OH)and acetoxy(-OCOMe)substitution atβ-position of the IC terminal group,we developed two new synthetic acceptors,BTIC-OH-β and BTIC-OCOMe-β,which were designed to confine the morphology aggregation.Introduction of an analogue as the third component provides a simple but efficient way to further balance the short current density(Jsc)and open-circuit voltage(Voc),leading to a champion efficiency based on PBDB-T:PBDB-TF:BTIC-OCOMe-β,effectively as high as 12.45％.The results were examined mainly in terms of the morphology character-ization,electroluminescence external quantum efficiency(EQEEL),steady-state photoluminescence(PL)and transient technology,It suggested fine-tuning of the morphology by ratio modulation,reduction of the energy loss,construction of a promising pathway for charge transfer in the ternary system and enhancing the carrier extraction.In this way,a ternary strategy with an analogue donor could provide more routes to higher-quality solar cells.

Longzhu Liu;Hanjian Lai;Feng He

School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China;Shenzhen Grubbs Institute and Department of Chemistry,Southern University of Science and Technology,Shenzhen 518055,Guangdong,China;Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen 518055,Guangdong,China

能源化学

[1]Longzhu Liu;Hanjian Lai;Feng He-.Ternary strategy:An analogue as third component reduces the energy loss and improves the efficiency of polymer solar cells)[J].能源化学,2022(07):67-73

OCOMe,BTIC,EQEEL

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