A Near-Infrared Polymer Acceptor Enables over 15%Efficiency for All-Polymer Solar Cells  

作　　者：Tao Wang Rui Sun Xin-Rong Yang Yao Wu Wei Wang Qian Li Chun-Feng Zhang Jie Min 

机构地区：[1]The Institute for Advanced Studies,Wuhan University,Wuhan,430072,China [2]National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210093,China [3]Beijing National Laboratory for Molecular Sciences,Beijing,100190,China [4]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou,450002,China

出　　处：《Chinese Journal of Polymer Science》2022年第8期877-888,I0007,共13页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.21702154 and 51773157);We also thank the support of the opening project of Key Laboratory of Materials Processing and Mold and Beijing National Laboratory for Molecular Sciences(No.BNLMS201905).

摘　　要：Finding effective molecular design strategies to enable efficient charge generation,high charge transport,and small energy loss is a longstanding challenge for developing high-performance all-polymer solar cells(all-PSCs).Here,we designed and synthesized a fused-aromatic-ring-constructed near-infrared(NIR)polymer acceptor(PA)PYT-Tz with fused-ring benzotriazole(BTz)-based A’-DAD-A’structure as electron-deficient-core,n-nonane as alkyl-side-chain and thiophene asπ-bridge,and achieved a power conversion efficiency(PCE)of 15.10%for the all-PSCs with PYT-Tz as acceptor and a wide-bandgap PBDB-T as donor.A control PA PYT reported by our lab recently was introduced for investigating the synergistic effect of the electron-deficient-core and alkyl-side-chain on the optoelectronic properties and photovoltaic performance of the n-type PAs.Compared with PYT,the designed PYT-Tz exhibits intense and red-shifted absorption,upshifted energy levels,high electron mobility and ordered molecular packing in the active layers,and,blended with PBDB-T,yields the efficient hole injection,ultrafast charge generation,and the decreased non-radiative recombination loss of 0.17 eV.Of note is that the PCE of 15.10%is one of the highest PCE values for an all-PSC reported to date.Our results indicate BTz-based fused-aromatic-ring-constructed PAs are promising NIR acceptors in the all-PSCs.

关 键 词：Benzotriazole-based A’-DAD-A’structure Near-infrared polymer acceptor High-performance all-polymer solar cells 

分 类 号：TQ317[化学工程—高聚物工业] TM914.4[电气工程—电力电子与电力传动]