Volume 42, Issue 22 pp. 2825-2832
Concise Report

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

Yufeng Ge

Yufeng Ge

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

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Xuewu Li

Xuewu Li

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

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Mingxu Zhou

Mingxu Zhou

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

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Peng Lu

Peng Lu

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

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Xiaotao Hao

Corresponding Author

Xiaotao Hao

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

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

E-mail: [email protected]Search for more papers by this author
First published: 17 July 2024
Citations: 1

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.

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