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Vol. 18 (2026)

Ammonia Borane All-In-One Modification Strategy Enables High-Performance Perovskite Solar Cells

https://doi.org/10.1007/s40820-025-01951-6
Jiaxin Ma
Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Cong Shao
Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Yirong Wang
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Guosheng Niu
Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Kaiyi Yang
Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
Yao Zhao
Beijing National Laboratory for Molecular Sciences, National Centre for Mass Spectrometry in Beijing, CAS Key Laboratory of Analytical Chemistry for Living Biosystems, Chinese Academy of Sciences, Beijing, People’s Republic of China
Fuyi Wang
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Zongxiu Nie
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Jizheng Wang
Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China

Corresponding Author: Jizheng Wang

jizheng@iccas.ac.cn

Nano-Micro Letters, Vol. 18 (2026), Article Number: 93

Abstract

Perovskite solar cells have achieved remarkable progress in photovoltaic efficiency. However, interfacial defects at the buried and upper interfaces of perovskite layer remain a critical challenge, leading to charge recombination, ion migration, and iodine oxidation. To address this, we propose a novel all-in-one modification strategy employing ammonia borane (BNH6) as a multifunctional complex. By incorporating BNH6 at both buried and upper interfaces simultaneously, we achieve dual-interfacial defect passivation and iodide oxidation suppression through three key mechanisms: (1) hydrolysis-induced interaction with SnO2, (2) coordination with Pb2+, and (3) inhibition of I− oxidation. This approach significantly enhances device performance, yielding a champion power conversion efficiency (PCE) of 26.43% (certified 25.98%). Furthermore, the unencapsulated device demonstrates prominent enhanced operation stability, maintaining 90% of its initial PCE after 500 h under continuous illumination. Notably, our strategy eliminates the need for separate interface treatments, streamlining fabrication and offering a scalable route toward high-performance perovskite photovoltaics.


Highlights:
1 An all-in-one modification strategy was developed by introducing a multifunctional complex ammonia borane (BNH6) into the buried and upper interfaces simultaneously.
2 BNH6 uniquely realizes dual-interfacial defect passivation and iodide oxidation suppression by interacting with SnO2 through hydrolysis, coordinating with Pb2+ and inhibiting the oxidation of I−.
3 The optimized perovskite solar cells achieve a champion efficiency of 26.43% (certified, 25.98%) with negligible current density–voltage hysteresis and significantly improved thermal and light stability.

Keywords

Ammonia borane All-in-one modification Multifunctional complex Perovskite solar cells
Ma, Jiaxin, Cong Shao, Yirong Wang, Guosheng Niu, Kaiyi Yang, Yao Zhao, Fuyi Wang, Zongxiu Nie, and Jizheng Wang. 2026. “Ammonia Borane All-In-One Modification Strategy Enables High-Performance Perovskite Solar Cells”. Nano-Micro Letters 18 (January):93. https://doi.org/10.1007/s40820-025-01951-6.
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