Synthesis of Long-Chain Oligomeric Donor and Acceptors via Direct Arylation for Organic Solar Cells  

作　　者：Yu Wu Xin-Yu He Xu-Min Huang Ling-Jun Yang Peng Liu Na Chen Chang-Zhi Li Shi-Yong Liu 

机构地区：[1]Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry,College of Materials,Metallurgical and Chemistry,Jiangxi University of Science and Technology,Ganzhou,Jiangxi,341000 China [2]Department of Polymer Science and Engineering,Zhejiang University,Hangzhou,Zhejiang,310027 China

出　　处：《Chinese Journal of Chemistry》2024年第5期523-532,共10页中国化学（英文版）

基　　金：The National Natural Science Foundation of China(No.22169009);Jiangxi Provincial Natural Science Foundation(No.20212ACB204007);Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry(20212BCD42018)are appreciated for financial support。

摘　　要：The rapid synthesis of structurally complicated electron donors&acceptors still remains a major challenge in organic solar cells(OSC).In this work,we developed a highly efficient strategy to access long-chain oligomeric donor and acceptors for OSC applications.A series of cyclopentadithiophene(CPDT)and benzothiadiazole(BT)-basedπ-conjugated oligomers,i.e.,three oligomeric acceptors(BTDT)n-IC(n=1—3)and one long-chain oligomeric donor(BTDT)4-RD,are facilely synthesized by an atom-and step-economical,and labor-saving direct C—H arylation(DACH)reaction(i.e.,C—H/C—Br cross coupling).Note that(BTDT)4-RD involving five CPDT,four BT and two rhodamine(RD)building blocks is the longest oligomeric donor in the fullerene-free OSC devices ever reported.The dependence of the structure-property-performance correlation of(BTDT)n-IC(n=1—3)and(BTDT)4-RD on theπ-conjugation lengths is thoroughly investigated by opto-electrochemical measurements,bulk heterojunction(BHJ)OSC devices and microscopies.The(BTDT)1-IC:PBDB-T and(BTDT)4-RD:Y6 BHJs achieve power conversion efficiencies of 9.14%and 4.51%,respectively.Our findings demonstrate that DACH reaction is a powerful tool to tune the opto-electronic properties and device performances by regulating the lengths ofπ-conjugated oligomers with varied numbers of repeating units.

关 键 词：Long-chainπ-conjugated oligomer Organic solar cells Direct arylation Atom-economical synthesis CYCLOPENTADITHIOPHENE BENZOTHIADIAZOLE C—H activation CONJUGATION Oligomers 

分 类 号：O62[理学—有机化学]