The impact of reabsorption effect on composition analysis of organic semiconductors  

自吸收效应对有机半导体材料组分分析的影响

作　　者：Bei Yang Xiaoke Liu Li Wan Weixin Ni Ni Yang Jianhui Hou Feng Gao 杨蓓;刘小可;万励;倪卫新;杨霓;侯剑辉;高峰(Electronic and Photonic Materials(EFM),Department of Physics,Chemistry and Biology(IFM),Linkoping University,Linkoping SE-58183,Sweden;Beijing National Laboratory for Molecular Sciences,State Key Laboratory of Polymer and Chemistry,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Electronic and Photonic Materials(EFM),Department of Physics,Chemistry and Biology(IFM),Linkoping University,Linkoping SE-58183,Sweden [2]Beijing National Laboratory for Molecular Sciences,State Key Laboratory of Polymer and Chemistry,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [3]Max Planck Institute of Microstructure Physic,Halle 06120,Germany

出　　处：《Science China Materials》2024年第10期3124-3131,共8页中国科学（材料科学）（英文版）

基　　金：supported by the Knut and Alice Wallenberg Foundation(Dnr.KAW 2019.0082);the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Link?ping University(Faculty Grant SFO-Mat-LiU No.2009-00971);the Swedish Energy Agency Energimyndigheten(No.48758-1);the National Academic Infrastructure for Super-computing in Sweden(NAISS);supported by the National Natural Science Foundation of China(No.52120105005);the financial support from the Swedish Research Council(No.2021-04674)。

摘　　要：Reabsorption is one of the most fundamental optical phenomena,but it has rarely been considered in spectroscopy-based composition analysis for organic semiconductors.Here,we take four state-of-the-art organic solar cell(OSC)materials as examples,and systematically investigate the influence of reabsorption on photoluminescence emission and excitation spectra by both experimental studies and optical simulations.We find that the overlap between absorption and emission spectra of these OSC materials is strong enough for them to be affected by the reabsorption effect,and the effect becomes more obvious between different species in the multi-components systems.Moreover,three features of the reabsorption effect and the reabsorption strength are identified,with which we have successfully analyzed the composition in a range of OSC materials in both solution and solid-state films.Our work not only provides an important understanding of the largely overlooked feature of reabsorption in the widely used spectroscopic techniques but also offers an effective toolbox for the composition analysis of organic semiconductors.重吸收效应是最基本的光学效应之一,但是在基于光谱技术的组分分析中很少考虑它的影响.在这里,我们以四个应用于有机太阳能电池(OSC)中的、高效的有机半导体材料为例,通过实验和光谱模拟,系统地研究了重吸收效应对荧光发射(PL)和激发(PLE)光谱的影响.我们发现,这些OSC材料的吸收和发射光谱之间的重叠已经强到足以产生明显的自吸收效应,这种效应在不同组分之间更加显著.此外,我们确认了自吸收效应的三种特征以及其强度的计算.根据这些,我们成功地对一系列OSC样品进行了组分分析.这些样品包括溶液和薄膜.我们的结果表明自吸收效应不仅可以影响组分分析结果的准确性,还可以在分析过程中提供帮助.

关 键 词：reabsorption effect composition analysis organic solar cells non-fullerene acceptors organic semiconductors 

分 类 号：TN304[电子电信—物理电子学]