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

作　　者：Yufeng Ge Xuewu Li Mingxu Zhou Peng Lu Xiaotao Hao 

机构地区：[1]School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan,Shandong 250100,China [2]Schoolof Physics,National Demonstration Center for Experimental Physics Education,Shandong University Jinan,Shandong 250100 China [3]ARC Centre of Excelence in Exciton Science,Schoolof Chemistry,The Universityof Mebourne,Parkville,Victoria 31,Australia

出　　处：《Chinese Journal of Chemistry》2024年第22期2825-2832,共8页中国化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52320105003,52073162);Major Program of Natural Science Foundation of Shandong Province(ZR2019ZD43);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).

摘　　要：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.

关 键 词：Organic photovoltaics Volatile additive Exciton diffusion Charge separation Hole transfer Morphology control PHOTOPHYSICS Kinetics π-πStacking Time-resolved spectroscopy Adsorption 

分 类 号：O64[理学—物理化学]