Probing molecular orientation at bulk heterojunctions by polarization-selective transient absorption spectroscopy

作     者：Cankun Zhang Yuzhe Zhang Zhiye Wang Yuming Su Zhixiang Wei Jianhui Hou Shan He Kaifeng Wu Chang He Jianqi Zhang Cheng Wang Cankun Zhang;Yuzhe Zhang;Zhiye Wang;Yuming Su;Zhixiang Wei;Jianhui Hou;Shan He;Kaifeng Wu;Chang He;Jianqi Zhang;Cheng Wang

作者机构：State Key Laboratory for Physical Chemistry of Solid SurfacesiChEMCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)FuzhouChina CAS Key Laboratory of Nanosystem and Hierarchical FabricationCAS Center for Excellence in NanosciecneNational Center for Nanoscience and TechnologyBeijing100190China State Key Laboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China State Key Laboratory of Molecular Reaction Dynamics and Dynamics Research Center for Energy and Environmental MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China 

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

年 卷 期：2021年第64卷第9期

页      面：1569-1576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）] 0703[理学-化学] 

基　　金：financially supported from National Key R&D Program of China(2016YFA0200700) the National Natural Science Foundation of China(22071207,21721001,21805230,51873217,21734008,51773047,52073068) 

主　　题：polarization-selective transient absorption spectroscopy bulk heterojunction organic solar cell molecular orientation 

摘      要：A bulk heterojunction in organic solar cells is where charge separation and recombination *** orientation at the interface is one of the key factors that dictate solar cell *** X-ray scattering-based methods can determine donor/acceptor domain orientations between an anisotropic phase and an isotropic fullerene-based phase,the rise of nonfullerene solar cells presents a new challenge in delineating local molecular directions at the interface between two anisotropic donor/acceptor ***,we determine interfacial molecular orientations of three high-efficiency small molecule solar cells(ZR1:Y6,B1:BO-4 Cl,and BTR:BO-4 Cl)using polarization-selective transient absorption *** polarization anisotropy of charge separation dynamics indicates an angle of~90°between ZR1 and Y6 molecules at the interface,an angle close to 0°between B1 and BO-4 Cl,and random orientations between BTR and BO-4 *** observations provide complementary information to X-ray scattering measurements and highlight polarization-selective transient absorption spectroscopy as a tool to probe interfacial structure and dynamics of key photophysical steps in energy conversion.