Volume 63, Issue 48 e202409330
Research Article

Multifunctional Modification of the Buried Interface in Mixed Tin-Lead Perovskite Solar Cells

Xinru Sun

Xinru Sun

Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China

Contribution: Writing - original draft (lead), Writing - review & editing (lead)

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Hongzhuo Wu

Hongzhuo Wu

Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China

Contribution: Data curation (supporting), Methodology (supporting)

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Zhihao Li

Zhihao Li

Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China

Contribution: Data curation (equal), Formal analysis (equal)

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Rui Zhu

Rui Zhu

Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China

Contribution: Formal analysis (equal)

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Guixiang Li

Guixiang Li

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Contribution: Data curation (equal)

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Zhenhuang Su

Zhenhuang Su

Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai, 201204 P. R. China

Contribution: Software (equal)

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Junhan Zhang

Junhan Zhang

Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai, 201204 P. R. China

Contribution: Software (equal)

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Xingyu Gao

Xingyu Gao

Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai, 201204 P. R. China

Contribution: Software (equal)

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Jorge Pascual

Jorge Pascual

Polymat, University of the Basque Country UPV/EHU, 20018 Donostia-San Sebastián, Spain

Contribution: Data curation (equal), Methodology (equal)

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Antonio Abate

Antonio Abate

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Contribution: Conceptualization (equal), Data curation (equal)

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Meng Li

Corresponding Author

Meng Li

Key Lab for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering, and Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China

Contribution: Conceptualization (lead), Data curation (lead), Funding acquisition (lead), Writing - review & editing (lead)

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First published: 05 August 2024
Citations: 10

Graphical Abstract

Regulating the buried interface is crucial for perovskite crystallization and charge transport. An innovative approach, using hydroxylamine salts for interface modification precisely anchors perovskite ions, promoting controlled crystal growth. This approach significantly enhances the efficiency and long-term stability of Sn−Pb perovskite solar cells, critical for future development of all-perovskite tandems.

Abstract

Mixed tin-lead perovskite solar cells can reach band gaps as low as 1.2 eV, offering high theoretical efficiency and serving as base materials for all-perovskite tandem solar cells. However, instability and high defect densities at the interfaces, particularly the buried surface, have limited performance improvements. In this work, we present the modification of the bottom perovskite interface with multifunctional hydroxylamine salts. These salts can effectively coordinate the different perovskite components, having critical influences in regulating the crystallization process and passivating defects of varying nature. The surface modification reduced traps at the interface and prevented the formation of excessive lead iodide, enhancing the quality of the films. The modified devices presented fill factors reaching 81 % and efficiencies of up to 23.8 %. The unencapsulated modified devices maintained over 95 % of their initial efficiency after 2000 h of shelf storage.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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