Comprehensive Summary The morphology of the active layer plays a crucial role in the performance of organic photovoltaics.Although volatile additives are commonly used to manipulate the morphology,their mechanism of a...Comprehensive Summary The morphology of the active layer plays a crucial role in the performance of organic photovoltaics.Although volatile additives are commonly used to manipulate the morphology,their mechanism of action remains poorly understood.In this study,we conducted a systematic exploration of the mechanism of the traditional volatile additive 1-CN in film formation kinetics of typical PM6:Y6 system.We found that 1-CN induces a secondary aggregation effect,improving film morphology and promoting face-on crystalline orientation.Through elucidating its impact on exciton dynamics,we established a link between morphology optimization and increased exciton diffusion length and accelerated charge separation.Our findings unveil the unique mechanism of action of volatile additive,providing a new perspective for improving the morphology and enhancing the performance of organic photovoltaic devices.展开更多
基金supported by the National Natural Science Foundation of China(52320105003,52073162)Major Program of Natural Science Foundation of Shandong Province(ZR2019ZD43)+2 种基金X.T.H also acknowledges support from Taishan Scholars Program(tstp20230610)the ARC Centre of Excellence in Exciton Science(CE170100026)Analytical Center for Structural Constituent and Physical Property of Core Facilities Sharing Platform,Shandong University for Femtosecond transient absorption spectroscopy system(TAS,2104573s).
文摘Comprehensive Summary The morphology of the active layer plays a crucial role in the performance of organic photovoltaics.Although volatile additives are commonly used to manipulate the morphology,their mechanism of action remains poorly understood.In this study,we conducted a systematic exploration of the mechanism of the traditional volatile additive 1-CN in film formation kinetics of typical PM6:Y6 system.We found that 1-CN induces a secondary aggregation effect,improving film morphology and promoting face-on crystalline orientation.Through elucidating its impact on exciton dynamics,we established a link between morphology optimization and increased exciton diffusion length and accelerated charge separation.Our findings unveil the unique mechanism of action of volatile additive,providing a new perspective for improving the morphology and enhancing the performance of organic photovoltaic devices.
