A Simple Building Block with Noncovalently Conformational Locks towards Constructing Low-Cost and High-Performance Nonfused Ring Electron Acceptors  

作　　者：Xiao-Bin Gu Jin-Hua Gao Zi-Yang Han Yu-Hao Shi Ya-Nan Wei Yin-Cheng Zhang Qian Peng Zhi-Xiang Wei Xin Zhang Hui Huang 

机构地区：[1]College of Materials Science and Opto-Electronic Technology,Center of Materials Science and Optoelectronics Engineering,CAS Center for Excellence in Topological Quantum Computation,CAS Key Laboratory of Vacuum Physics,University of Chinese Academy of Sciences,Beijing,100049,China [2]School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing,100049,China [3]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing,100190,China

出　　处：《Chinese Journal of Polymer Science》2023年第4期556-563,I0008,共9页高分子科学（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52103352,51925306 and 52120105006);National Key R&D Program of China(No.2018FYA 0305800);Key Research Program of Chinese Academy of Sciences(No.XDPB08-2);the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB28000000);the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.2022165);the Fundamental Research Funds for the Central Universities.

摘　　要：Nonfused ring electron acceptors(NFREAs)have attracted much attention due to their concise synthetic routes and low cost.However,developing high-performance NFREAs with simple structure remains a great challenge.In this work,a simple building block(POBT)with noncovalently conformational locks(No CLs)was designed and synthesized.Single-crystal X-ray study indicated the presence of S…O NOCLs in POBT,thus enabling it to possess a coplanar conformation comparable to that of fused-ring CPT.Two novel NFREAs based on CPT and POBT were developed,namely TT-CPT and TT-POBT,respectively.Besides,TT-POBT possessed a smaller Stokes shift and a reduced reorganization energy compared with TT-CPT,indicating the introduction of S…O No CLs can enhance the molecular rigidity even if simplifying the molecular structure.As a result,the TT-POBT-based PSC device afforded an impressive power conversion efficiency of 11.15%,much higher than that of TT-CPT counterpart(7.03%),mainly resulting from the tighterπ-πstacking,improved and balanced charge transport,and more favorable film morphology.This work demonstrates the potential of the simple building block POBT with No CLs towards constructing low-cost and highperformance NFREAs.

关 键 词：Polymer solar cells Nonfused ring electron acceptors Simple building block Noncovalent conformation locks Reorganization energy 

分 类 号：O626[理学—有机化学]