【摘 要】
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A bulk heterojunction in organic solar cells is where charge separation and recombination occur.Molecular orientation at the interface is one of the key factors that dictate solar cell efficiency.Although X-ray scattering-based methods can determine donor
【机 构】
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State Key Laboratory for Physical Chemistry of Solid Surfaces,iChEM,College of Chemistry and Chemica
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A bulk heterojunction in organic solar cells is where charge separation and recombination occur.Molecular orientation at the interface is one of the key factors that dictate solar cell efficiency.Although X-ray scattering-based methods can determine donor/acceptor domain orientations between an anisotropic phase and an isotropic fullerene-based phase,the rise of non-fullerene solar cells presents a new challenge in delineating local molecular directions at the interface between two anisotropic donor/acceptor domains.Here,we determine interfacial molecular orientations of three high-efficiency small molecule solar cells (ZR1 :Y6,B1 :BO-4Cl,and BTR:BO-4C1) using polarization-selective transient absorption spectroscopy.The 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-4Cl,and random orientations between BTR and BO-4Cl.These observations provide com-plementary 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.
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