Article

Cyclically Dynamic Defect Management Enables High‐efficiency Sn─Pb Perovskite Photovoltaics with Enhanced Photostability and Fatigue Resistance

Xueqing ChangMOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry, IGCME Sun Yat‐sen University Guangzhou 510006 P.R. ChinaGuo YangMOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry, IGCME Sun Yat‐sen University Guangzhou 510006 P.R. ChinaHuanyu ChenMOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry, IGCME Sun Yat‐sen University Guangzhou 510006 P.R. ChinaJinghui CaoSchool of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 P.R. ChinaJun‐Xing ZhongSchool of chemistry and Materials Science Guangdong University of Education Guangzhou 510303 P.R. ChinaYing TanMOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry, IGCME Sun Yat‐sen University Guangzhou 510006 P.R. ChinaMeifang YangSchool of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 P.R. ChinaBowen JinHubei Key Laboratory of Polymer Materials School of New Energy and Electrical Engineering Hubei University Wuhan 430062 P.R. ChinaCongcong WuHubei Key Laboratory of Polymer Materials School of New Energy and Electrical Engineering Hubei University Wuhan 430062 P.R. ChinaSibo LiSUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 P.R. ChinaLongbin QiuSUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 P.R. ChinaQing LiKey Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 P.R. ChinaShuang YangKey Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 P.R. ChinaQingqian WangInstitute of Physics Henan Academy of Sciences Mingli Road, 266‐38 Zhengzhou 450046 P.R. ChinaHuan PangSchool of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 P.R. ChinaD. D. GulamovaUzbekistan Academy of Sciences Institute of Material Sciences Chingiz Aytmatov str.2B Tashkent 100084 UzbekistanWu‐Qiang WuMOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry, IGCME Sun Yat‐sen University Guangzhou 510006 P.R. China

Angewandte Chemiejournal2025de

ABI

Abstract

Abstract Narrow‐bandgap mixed Sn‐Pb perovskite solar cells (PSCs) have showcased great promise to approach the Shockley‐Queisser limit. Despite continuously proven elevated power conversion efficiencies (PCEs), the practical application and commercial use of Sn‐Pb PSCs are hindered by poor photostability and anti‐fatigue performance. These issues arise from multiple intrinsic imperfections formed during crystallization and light‐triggered defects generated during device operation under intermittent illumination. Herein, we introduced a novel “dynamic defect management” (DDM) strategy that mitigated photodegradation of Sn‐Pb perovskites and significantly enhanced the device lifespan. The strong coordination between metallocene intercalation and metal cations (Pb 2+ /Sn 2+ ) within the perovskite lattice effectively passivated the crystallographic defects, reduced the defect densities by 34.5% and suppressed the non‐radiative recombination. Furthermore, the metallocene and corresponding cation could function as a redox pair, offering a dynamic and continuous healing mechanism to restore the light‐induced defects in a cyclical manner. Additionally, the metallocene interlayer itself acted as a shield against the ultraviolet radiation during the light aging process. Consequently, we achieved decent PCEs up to 23.59% for the mixed Sn‐Pb PSCs modified with DDM strategy, 14.7% higher than that of the reference devices, accompanied by enhanced photostability which witnessed a 7‐fold enhancement compared to the pristine device under MPP operation tracking and remarkable anti‐fatigue performance, retaining 83% of the original PCE after 22 accelerated fatigue test cycles (12/12 h UV light/dark cycle).

Topics

Perovskite Materials and Applications Organic Electronics and Photovoltaics Thermal Expansion and Ionic Conductivity

Identifiers

DOI: 10.1002/ange.202514563

Citations and references

Cited by 047 references

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