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In situ studies on the positive and negative effects of 1,8-diiodoctane on the device performance and morphology evolution of organic solar cells

引用

Nuclear Science and Techniques 2021年第6期32卷 23-35页

作者： Da Huang Chun-xia Hong Jian-Hua Han Nie Zhao xiu-Hong Li xi-Chang Bao Feng-Gang Bian Yu-Ying Huang Chun-Ming Yang Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China CAS Key Laboratory of Bio-Based Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China University of Chinese Academy of Sciences Beijing 100049China Functional Laboratory of Solar Energy Shandong Energy InstituteQingdao 266101China College of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

The introduction of solvent additives is one of the most common approaches for enhancing the power conversion efficiency of organic solar cells(OSCs).However,the use of solvent additives has some negative effects,and an understanding of how solvent additives affect OSCs is currently *** this study,we developed an in situ grazing incidence wide-angle x-ray scattering(GIWAxS)technique in the SAxS beamline(BL16 B1)at the Shanghai Synchrotron Radiation Facility,and the additive effects of1,8-diiodoctane(DIO)on the performance and morphology evolution of the PTB7-Th/PC71 BM device was investigated in *** results revealed that the crystal size increased with the volume ratio of DIO,and a drastic evolution of lattice space and crystal coherence length was observed during thermal annealing for the first time,to our *** discrete PC71BM molecules dissolved by DIO have an effect similar to that of the nucleating agent for PTB7-Th,boosting the crystallization of PTB7-Th,reducing phase separation,and inducing more drastic morphological evolution during thermal *** results provide a deep perspective for the mechanism of solvent additives,while also showing the significance and feasibility of the in situ GIWAxS technique we developed at BL16 B1.

关键词： grazing incidence wide-angle x-ray scattering grazing incidence small-angle x-ray scattering Organic solar cells Solvent additive Thermal stability

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