Synergetic Alkoxy Side-Chain and Chlorine-Contained End Group Strategy toward High Performance Ultra-Narrow Bandgap Small Molecule Acceptors

作     者：Qingya Wei Songting Liang Beibei Qiu Wei Liu Xiang Xu Xinhui Lu Yuang Fu Jun Yuan Yingping Zou Qingya Wei;Songting Liang;Beibei Qiu;Wei Liu;Xiang Xu;Xinhui Lu;Yuang Fu;Jun Yuan;Yingping Zou

作者机构：State Key Laboratory of Powder MetallurgyCollege of Chemistry and Chemical EngineeringCentral South UniversityChangsha Hunan 410083China Key Laboratory of Solid State Optoelectronic Devicesof Zhejiang ProvinceCollege of Physics and Electronic Information EngineeringZhejiang Normal UniversityJinhuaZhejiang 321004China Departmentof PhysicsThe Chinese University of Hong KongNew TerritoriesHong Kong 999077China School of Materials Science and EngineeringZhengzhou UniversityZhengzhouHenan 450001China 

出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)

年 卷 期：2023年第41卷第20期

页      面：2664-2670页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.52125306 22005347) 

主　　题：Organic solar cells A-DA'D-A type small molecule acceptors Ultra-narrow bandgap Alkoxy side chains Ternary strategy π-πstacking 

摘      要：Ultra-narrow bandgap(ultra-NBG)small molecule acceptors(SMAs)show great potential in organic solar cells(OSCs)due to the extended near-infrared(NIR)*** this work,a synergetic alkoxy side-chain and chlorine-contained end group strategy is employed to achieve A-DA D-A type ultra-NBG SMAs by introducing alkoxy chains with oxygen atom at the second position into the thiopheneβposition as well as replacing the F atoms with Cl atoms in the end *** a result,the heptacyclic BZO-4F shows a redshifted absorption onset(960 nm)compared with Y11(932 nm)without oxygen atoms in the side ***,the fluorinated end groups are substituted with the chlorinated ones to synthesize *** absorption onset of BZO-4Cl is further redshifted to 990 nm,corresponding to an optical ultra-NBG of 1.25 *** blending with the polymer donor PBDB-T,the binary devices based on PBDB-T:BZO-4F and PBDB-T:BZO-4Cl deliver power conversion efficiencies(PCEs)over 12%.Furthermore,ternary devices with the addition of BZ4F-O-1 into PBDB-T:BZO-4Cl system achieve the optimal PCE of 15.51%.This work proposes a synergetic alkoxy side-chain and chlorine-contained end group strategy to achieve A-DA D-A type ultra-NBG SMAs,which is important for future molecular design.