Zhou Huanping of Peking University published another paper on perovskite in Science just one week later!

2025/8/30 9:15:14 admin 阅读 201【次】

A research paper titled "Nonalloyed α-phase formamidinium lead triiodide solar cells through iodine intercalation" was published in the journal Science by Zhou Huanping's team. Yu Zhang is the first author, and Zhou Huanping is the corresponding author.

Key Highlight: This paper develops a kinetically regulated strategy to fabricate high-quality, stable non-alloyed α-FAPbI3 thin films, supplemented by co-existing volatile iodine intercalation and deintercalation. Solar cells based on this non-alloyed α-FAPbI3 (without other extrinsic constituent ions) achieve a power conversion efficiency exceeding 24%. They also exhibit excellent durability, retaining 99% of their original power conversion efficiency after operating for over 1100 hours under illumination conditions at 85±5°C.

Formamidinium lead triiodide (FAPbI3) is considered the most competitive absorber material for high-performance single-junction solar cells, but it suffers from complex crystallization kinetics and thermodynamic metastability, and fabricating non-alloyed, high-quality α-FAPbI3 perovskite films has proven difficult. Challenges include the higher nucleation barrier of α-FAPbI3 compared to the inactive δ-FAPbI3, mass transport limitations of FAI, and moisture sensitivity associated with α-phase degradation, which often result in low film crystal quality and poor stability.

To address this issue, Zhou Huanping's team at Peking University developed a kinetically regulated strategy to fabricate high-quality, stable non-alloyed α-FAPbI3 films, supplemented by co-existing volatile iodine intercalation and deintercalation. Iodine intercalation promotes the formation of corner-sharing Pb-I framework building blocks and reduces the kinetic barrier to α-FAPbI3 formation, while iodine deintercalation improves the quality of the final perovskite film in terms of compositional purity and overall uniformity. Solar cells based on this non-alloyed α-FAPbI3 (without other extrinsic constituent ions) achieved power conversion efficiencies exceeding 24%. The devices also exhibited excellent durability, retaining 99% of their original power conversion efficiency after operating for over 1100 hours under illumination conditions at 85±5°C.

This study highlights the importance of unalloyed FAPbI3 (without other ions such as MA+, Cs+, Br−, and SCN−) for the intrinsic stability of perovskite materials and reveals how iodine chemistry dynamically regulates the formation pathway of metastable perovskites and other optoelectronic materials with soft ion lattices.

Source：DOI：10.1126/science.ads8968

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Zhou Huanping of Peking University published another paper on perovskite in Science just one week later!

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