Constructing the low-cost,high-efficiency,and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar cells.Herein,we develop a structurally simple carboxylate-subst...Constructing the low-cost,high-efficiency,and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar cells.Herein,we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer,PBTTzE,containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl)donor unit.Benefiting from synergistic electron deficient effects of chlorination and ester group and C=N,as well as the noncovalent interaction of S…O and S…N,PBTTzE exhibits a deep HOMO energy level(−5.59 eV),and a planar skeleton structure.When combined with the IT-4F acceptor,the polymer(54 kDa)demonstrated a champion PCE of 15.87%,which is the highest value in the IT-4F-based binary devices to date.Moreover,PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 kDa.In addition,an alloyed state and complementary absorption can be formed between PM6 and PBTTzE.Therefore,in a ternary device with PBTTzE added to the PM6:BTP-eC9 blend,a top PCE of 18.76%is achieved due to the suppressed energy loss,prolonged exciton diffusion distance,and improved charge transport.Our work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.展开更多
基金supported by the National Natural Science Foundation of China(52003209,51973169,52273195)Key R&D program of Hubei Province(2022BAA095)+1 种基金Open Key Fund Project of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing of Wuhan University of Technology(2022-KF-34)Scientific Research Foundation of Wuhan Institute of Technology(K202023).
文摘Constructing the low-cost,high-efficiency,and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar cells.Herein,we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer,PBTTzE,containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl)donor unit.Benefiting from synergistic electron deficient effects of chlorination and ester group and C=N,as well as the noncovalent interaction of S…O and S…N,PBTTzE exhibits a deep HOMO energy level(−5.59 eV),and a planar skeleton structure.When combined with the IT-4F acceptor,the polymer(54 kDa)demonstrated a champion PCE of 15.87%,which is the highest value in the IT-4F-based binary devices to date.Moreover,PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 kDa.In addition,an alloyed state and complementary absorption can be formed between PM6 and PBTTzE.Therefore,in a ternary device with PBTTzE added to the PM6:BTP-eC9 blend,a top PCE of 18.76%is achieved due to the suppressed energy loss,prolonged exciton diffusion distance,and improved charge transport.Our work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.
