首页|Secondary Aggregation Induced by Volatile Additive for Improved Exciton Diffusion and Charge Separation in High Efficiency Organic Photovoltaic Devices

Secondary Aggregation Induced by Volatile Additive for Improved Exciton Diffusion and Charge Separation in High Efficiency Organic Photovoltaic Devices

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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.

Organic photovoltaicsVolatile additiveExciton diffusionCharge separationHole transferMorphology controlPhotophysicsKineticsπ-π StackingTime-resolved spectroscopyAdsorption

Yufeng Ge、Xuewu Li、Mingxu Zhou、Peng Lu、Xiaotao Hao

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School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan,Shandong 250100,China

School of Physics,National Demonstration Center for Experimental Physics Education,Shandong University,Jinan,Shandong 250100,China

ARC Centre of Excellence in Exciton Science,School of Chemistry,The University of Melbourne,Parkville,Victoria 3010,Australia

2024

10.1002/cjoc.202400397

中国化学(英文版)
中国化学会 上海有机化学研究所

中国化学(英文版)

CSTPCD
影响因子：0.848
ISSN：1001-604X
年,卷(期)：2024.42(22)