The manipulation of the morphology of the active layers is crucial for improving the performance of organic photovoltaic(OPV)devices.In particular,the development of non-fullerene acceptors(NFAs)has led to a large number of new materials with more complex interactions.Therefore,the investigation on the morphology control mechanism is the key aspect in providing guidance for material design and device optimization.In this study,the film morphology optimization using 1,8-diiodooctane(DIO)additive and a ternary fullerene acceptor strategy have been carried out based on the PCE10:ITIC blends.It is seen that suitable amount of DIO helps to increase the crystallization of the blended thin film.However,excessive DIO elevates the crystallization-induced phase separation and the domain size can exceed the exciton diffusion length,leading to efficiency drop.The addition of fullerene acceptor can improve the carrier transport of the blends,and its presence could retard the excessive phase separation induced by DIO additive.Under the joint optimization of the solvent additive and PC71BM acceptor,the film morphology achieves a balance between crystallization and phase separation scales,the exciton diffusion and carrier transport are also optimized,and the short-circuit current(Jsc)and fill factor(FF)of the device can be improved significantly.

Lei Zhu;Quan-Zeng Zhang;Hong Ding;Ming Zhang;Xiao-Nan Xue;Wen-Kai Zhong;Zi-Chun Zhou;Jin-Qiu Xu;Wei Feng;Ye-Cheng Zou;Yong-Ming Zhang;Feng Liu

Frontiers Science Center for Transformative Molecules,In-situ Center for Physical Science,and Center of Hydrogen Science,School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai200240,China;State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company,Zibo 256401,China

高分子科学（英文版）

[1]Lei Zhu;Quan-Zeng Zhang;Hong Ding;Ming Zhang;Xiao-Nan Xue;Wen-Kai Zhong;Zi-Chun Zhou;Jin-Qiu Xu;Wei Feng;Ye-Cheng Zou;Yong-Ming Zhang;Feng Liu-.Unraveling the Effect of Solvent Additive and Fullerene Component on Morphological Control in Organic Solar Cells)[J].高分子科学（英文版）,2022(12):1604-1612

diiodooctane,PCE10

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