Research Article

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2021, 14(5): 1319–1325

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https://doi.org/10.1007/s12274-020-3169-y

Control of vertical phase separation in high performance nonfullerene organic solar cell by introducing oscillating stratification preprocessing

Dayong Zhang1, Pu Fan1, Jinyu Shi1, Yifan Zheng2 (✉), Jian Zhong1 (✉), and Junsheng Yu1 (✉)

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1 State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

Keywords: oscillating stratification preprocessing, graded vertical phase separation, non-fullerene organic solar cells, high performance, sequential solution deposition
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  • Abstract
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Non-fullerene organic solar cell (NFOSC) has attracted tremendous attention due to their great potential for commercial applications. To improve its power conversion efficiency (PCE), generally, sequential solution deposition (SSD) methods have been employed to construct the graded vertical phase separation (VPS) of the bulk-heterojunction (BHJ) active layer for efficient exciton separation and charge transition. However, a variety of orthogonal solvents used in the SSD may lead to the unpredicted change in the BHJ morphology and introduce additional defects inside the BHJ bulk thus complicate the fabrication process. Here, a simple oscillating stratification preprocessing (OSP) is developed to facilitate the formation of graded VPS among the BHJ layer. As a result, a significant improvement is obtained in PCE from 10.96% to 12.03%, which is the highest value reported among PBDB-T: ITIC based NFOSC.
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Control of vertical phase separation in high performance nonfullerene organic solar cell by introducing oscillating stratification preprocessing. Nano Res. 2021, 14(5): 1319–1325 https://doi.org/10.1007/s12274-020-3169-y

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