Narrow bandgap molecular dyads incorporating Y-series acceptor backbones for efficient single-molecular organic solar cells

作     者：Yuan Gao Bo Xiao Shanshan Wang Mingxia Chen Wei Wang Xinrong Yang Yiming Shao Rui Sun Jie Min 

作者机构：The Institute for Advanced StudiesWuhan UniversityWuhan 430072China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2023年第66卷第11期

页      面：3205-3212页

核心收录：

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

基　　金：supported by the National Natural Science Foundation of China(52061135206,22279094) the Fundamental Research Funds for the Central Universities 

主　　题：donor-acceptor dyads single-material organic solar cells Y-series acceptors operational stability optical bandgap 

摘      要：The performance of organic solar cells(OSCs)is mainly related to the bulk heterojunction(BHJ)microstructure of specific active layer systems,which is often in a metastable state.A promising strategy to address the abovementioned shortcomings of BHJs is to develop single-component active layer *** to the single-component small molecule materials with defined chemical structures generally exhibit poor absorption spectra,herein we first introduced narrow bandgap Y-series acceptors into the molecular skeleton of single-component materials,and designed two molecular dyads,SM-Et-1Y and *** optical bandgaps(E_g~(opt)s)of the two dyads are 1.364 and 1.361 eV,respectively,which are much smaller than those of previously reported single-component ***,the SM-Et-2Y-based single-component OSCs(SCOSCs)showed a power conversion efficiency(PCE)of 5.07%,superior to SM-Et-1Y(2.53%),which is one of the highest PCEs reported for SCOSCs to ***,both SM-Et-1Y-and SM-Et-2Y-based devices exhibited excellent photo-stability,retaining over 90%of their initial performance after 250 h of continuous *** results provide a deeper understanding of the molecular backbone and a guiding principle for the rational design or selection of non-fullerene single-component materials with suitable donor/acceptor ratios.