Volume 21, Issue 3 2410601
Research Article

The Molecular Additive N-Acetyl-L-Phenylalanine Delays the Crystallization and Suppresses the Phase Impurity for Achieving Triple-Cation Perovskite Solar Cells with Efficiency Over 25%

Yang Ding

Yang Ding

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

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Siyuan Lu

Siyuan Lu

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

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Jianhui Chang

Jianhui Chang

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

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Erming Feng

Erming Feng

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

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Hengyue Li

Hengyue Li

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083 China

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Caoyu Long

Caoyu Long

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

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Yingguo Yang

Yingguo Yang

School of Microelectronics Fudan University, Shanghai, 200433 P. R. China

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Chenyi Yi

Chenyi Yi

State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, 100084 P. R. China

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Zijian Zheng

Zijian Zheng

Department of Applied Biology and Chemical Technology, Faculty of Science, The Hong Kong Polytechnic University, Hong Kong, 100872 P. R. China

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Liming Ding

Liming Ding

Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190 P. R. China

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Junliang Yang

Corresponding Author

Junliang Yang

Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha, 410083 P. R. China

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha, 410083 P. R. China

State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083 China

E-mail: [email protected]

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First published: 24 November 2024
Citations: 3

Abstract

The crystallization process plays an important role in the formation of high-quality perovskite film for achieving efficient perovskite solar cells (PSCs), especially in the formation of mixed-cation perovskite film, as there are normally more phase impurities than in pure CH(NH2)2PbI3 (FAPbI3) film. Herein, a molecular additive strategy, i.e., introducing non-planar molecule N-acetyl-L-phenylalanine (APO) into the lead iodide (PbI2) precursor solution, is proposed to modulate crystallization kinetics and inhibit the generation of phase impurities of metastable pretreated perovskite film. The delayed crystallization process promotes a sufficient reaction between organic salts solution and inorganic Pb-I framework, and perovskite phase decomposition is prevented by forming strong hydrogen bonds between ─NH and I, resulting in the formation of uniform film with large-size crystal grains and high-purity crystalline phase. Ultimately, the target PSC devices achieve an impressive power conversion efficiency (PCE) of 25.05%, which is among the highest values of triple-cation (FAMACs) PSCs. Meanwhile, PSC modules with 10.8 cm2 obtain a PCE of 20.35%. Furthermore, the unencapsulated PSCs retain 94% of the initial efficiency after 40 days of storage under ambient conditions with 20% RH and also yield superior operational stability under light soaking at maximum power point tracking (MPPT) in nitrogen (N2) atmosphere.

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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