Volume 62, Issue 45 e202313133
Research Article

Understanding the Role of Fluorine Groups in Passivating Defects for Perovskite Solar Cells

Xiaoqing Jiang

Corresponding Author

Xiaoqing Jiang

College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

These authors contributed equally to this work.

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Guangyue Yang

Guangyue Yang

College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

These authors contributed equally to this work.

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Bingqian Zhang

Bingqian Zhang

Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 China

Shandong Energy Institute, Qingdao, 266101 China

Qingdao New Energy Shandong Laboratory, Qingdao, 266101 China

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

These authors contributed equally to this work.

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Linqin Wang

Linqin Wang

Center of Artificial Photosynthesis for Solar Fuels, School of Science, Westlake University, Hangzhou, 310024 Zhejiang, China

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Yanfeng Yin

Yanfeng Yin

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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Fengshan Zhang

Fengshan Zhang

Shandong Huatai Paper Co., Ltd. & Shandong Yellow Triangle Biotechnology Industry Research Institute Co. LTD, Dongying, 257335 China

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Shitao Yu

Shitao Yu

College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

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Shiwei Liu

Shiwei Liu

College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

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Hongkai Bu

Hongkai Bu

College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

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Zhongmin Zhou

Corresponding Author

Zhongmin Zhou

College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042 China

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Licheng Sun

Licheng Sun

Center of Artificial Photosynthesis for Solar Fuels, School of Science, Westlake University, Hangzhou, 310024 Zhejiang, China

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Shuping Pang

Corresponding Author

Shuping Pang

Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 China

Shandong Energy Institute, Qingdao, 266101 China

Qingdao New Energy Shandong Laboratory, Qingdao, 266101 China

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Xin Guo

Corresponding Author

Xin Guo

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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First published: 21 September 2023
Citations: 25

Graphical Abstract

In passivating perovskite defects it is shown that the F group can interact with the passivation groups of the additives, leading to different abilities to passivate defects rather than only introducing additional interactions between F and Pb2+ as previously thought. The efficiencies of perovskite solar cells and modules made with the fluorinated passivators reach 24.70 % (0.09 cm2) and 21.13 % (14.0 cm2), respectively, with long-term stability.

Abstract

Introducing fluorine (F) groups into a passivator plays an important role in enhancing the defect passivation effect for the perovskite film, which is usually attributed to the direct interaction of F and defect states. However, the interaction between electronegative F and electron-rich passivation groups in the same molecule, which may influence the passivation effect, is ignored. We herein report that such interactions can vary the electron cloud distribution around the passivation groups and thus changing their coordination with defect sites. By comparing two fluorinated molecules, heptafluorobutylamine (HFBM) and heptafluorobutyric acid (HFBA), we find that the F/−NH2 interaction in HFBM is stronger than the F/−COOH one in HFBA, inducing weaker passivation ability of HFBM than HFBA. Accordingly, HFBA-based perovskite solar cells (PSCs) provide an efficiency of 24.70 % with excellent long-term stability. Moreover, the efficiency of a large-area perovskite module (14.0 cm2) based on HFBA reaches 21.13 %. Our work offers an insight into understanding an unaware role of the F group in impacting the passivation effect for the perovskite film.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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