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 as π-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.

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

The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China;National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;Beijing National Laboratory for Molecular Sciences,Beijing 100190,China;Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou 450002,China

高分子科学（英文版）

[1]Tao Wang;Rui Sun;Xin-Rong Yang;Yao Wu;Wei Wang;Qian Li;Chun-Feng Zhang;Jie Min-.A Near-Infrared Polymer Acceptor Enables over 15％Efficiency for All-Polymer Solar Cells)[J].高分子科学（英文版）,2022(08):877-888

PYT

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