A-DA’D-A Type Pentacyclic Small Molecule Acceptors to Exceed 16.5%Efficiency by Heteroatom Effect at the Outer Side Chain  

作　　者：Shaofeng Zhu Changzhou Shi Qingya Wei Can Zhu Jie Ren Jianghua Li Lei Meng Yongfang Li Jun Yuan Yingping Zou 

机构地区：[1]State Key Laboratory of Powder Metallurgy,College of Chemistry and Chemical Engineering,Central South University,Changsha,Hunan 410083,China [2]Beiing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China. [3]MOE Key Laboratory of Macromolecular Synthesis and Functionalization,International Research Center for X Polymers,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou,Zhejiang 310027,China

出　　处：《Chinese Journal of Chemistry》2023年第15期1815-1822,共8页中国化学（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52125306,22005347,21875286);the Natural Science Foundation of Hunan Province(2021JJ20068);the Central South University Innovation-Driven Research Program(No.2023CXQD052).

摘　　要：Comprehensive Summary In this work,we adopt a“heteroatom side-chains”modification strategy to modify the thiophene units in A-DA'D-A(acceptor-donor-acceptor’-donor-acceptor)type pentacyclic SMAs(small molecule acceptors),that is,introducing branched alkyl chain at theβ-position of thiophene instead of straight alkyl chain,and then introducing oxygen atom at the third-position on the basis of branched chain.Two new pentacyclic SMAs(BZ4F-EH and BZ4F-OEH)were synthesized,and the influence of the heteroatom side-chains on photoelectric properties of A-DA'D-A type pentacyclic SMAs was systematically studied.Compared with our previously reported BZ4F(Y26),BZ4F-EH shows slightly blue-shifted absorption,while BZ4F-OEH has obvious red-shifted absorption.As a result,BZ4F-OEH-based binary device achieved a high power conversion efficiency(PCE)of 16.56%with a fill factor(FF)of 79.3%,which is the highest efficiency of pentacyclic SMAs to date.

关 键 词：Organic solar cells Small molecule acceptors A-DA'D-A type structure Heteroatom side chains Substituent effects 

分 类 号：TM914.4[电气工程—电力电子与电力传动]