Volume 63, Issue 14 e202319282
Research Article

Kinetics Controlled Perovskite Crystallization for High Performance Solar Cells

Jinghao Ge

Jinghao Ge

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, International Joint Research Center of Shaanxi Province for Photoelectric Materials Science, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119 China

These authors contributed equally.

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Ran Chen

Ran Chen

School of Materials Science and Engineering, Xi'an University of Science and Technology, No. 67, Xiaozhai East Road, Xi'an, Shaanxi, 710054 PR China

These authors contributed equally.

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Yabin Ma

Yabin Ma

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Yunfan Wang

Yunfan Wang

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Yingjie Hu

Yingjie Hu

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Lu Zhang

Lu Zhang

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, International Joint Research Center of Shaanxi Province for Photoelectric Materials Science, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119 China

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Fengzhu Li

Fengzhu Li

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Xiaokang Ma

Xiaokang Ma

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, No. 127, Laodong West Road, Xi'an, Shaanxi, 710072 PR China

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Sai-Wing Tsang

Sai-Wing Tsang

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Jiaxue You

Corresponding Author

Jiaxue You

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Alex K. Y. Jen

Corresponding Author

Alex K. Y. Jen

Department of Materials Science and Engineering, Hong Kong Institute for Clean Energy, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China

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Shengzhong Frank Liu

Corresponding Author

Shengzhong Frank Liu

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, International Joint Research Center of Shaanxi Province for Photoelectric Materials Science, Institute for Advanced Energy Materials, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119 China

Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, No.457 Zhongshan Road, Shahekou District, Dalian, 116023 China

University of the Chinese Academy of Sciences, No. 80, Zhongguancun East Road, Beijing, 100039 China

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First published: 25 January 2024
Citations: 30

Graphical Abstract

Crystallization control of perovskite thin films is the key in commerciallization of perovskite solar cells. However, the fast crystallization of the thin film including nucleation, growth and Oswald ripening, is still a mystery though some efforts made. According to the theories of nucleation and Oswald ripening, we modified the perovskite surface energy and improved the grain solubility, and quantified the nucleation and ripening rate in experiments.

Abstract

The power conversion efficiencies (PCEs) of perovskite solar cells have recently developed rapidly compared to crystalline silicon solar cells. To have an effective way to control the crystallization of perovskite thin films is the key for achieving good device performance. However, a paradox in perovskite crystallization is from the mismatch between nucleation and Oswald ripening. Usually, the large numbers of nucleation sites tend to weak Oswald ripening. Here, we proposed a new mechanism to promote the formation of nucleation sites by reducing surface energy from 44.9 mN/m to 36.1 mN/m, to spontaneously accelerate the later Oswald ripening process by improving the grain solubility through the elastic modulus regulation. The ripening rate is increased from 2.37 Åm ⋅ s−1 to 4.61 Åm ⋅ s−1 during annealing. Finally, the solar cells derived from the optimized films showed significantly improved PCE from 23.14 % to 25.32 %. The long-term stability tests show excellent thermal stability (the optimized device without encapsulation maintaining 82 % of its initial PCE after 800 h aging at 85 °C) and an improved light stability under illumination. This work provides a new method, the elastic modulus regulation, to enhance the ripening process.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

Data available on reasonable request from the corresponding author.

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