Low-Temperature Encapsulation with Silicone Grease Enhances Efficiency and Stability of Perovskite Solar Cells via Pb0 Defect Passivation

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-04-22 DOI:10.1002/adfm.202425979

Jionghua Wu, Junxing Lan, Renjie Wang, Can Cheng, Weihuang Wang, Hui Deng, Qiao Zheng, Mingdeng Wei, Yiming Li, Shuying Cheng

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Abstract

Encapsulation is a critical strategy for mitigating the instability of perovskites, which remains the primary challenge for their commercialization. Traditional encapsulation adhesives, such as ethylene vinyl acetate and epoxy resin, are constrained by high-temperature processes and potential chemical reactions that can impair the efficiency of perovskite devices. The use of vacuum silicone grease, primarily composed of polydimethylsiloxane (PDMS), not only shields the perovskite devices from moisture and oxygen but also significantly enhances their power conversion efficiency from 23.91% to 25.34%. Further investigations reveal that this improvement can be attributed to the formation of coordination bonds between the oxygen atoms in PDMS and lead within the perovskite structure. This mechanism boosts efficiency and inhibits the formation of Pb⁰ defects, significantly contributing to efficiency loss and instability. A ten-fold increase in stability is observed at ≈90% humidity, underscoring its potential as a low-temperature, non-damaging, and effective encapsulation method for enhancing the stability and performance of perovskite solar cells.

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硅脂低温封装通过Pb0缺陷钝化提高钙钛矿太阳能电池的效率和稳定性

封装是缓解包晶石不稳定性的关键策略，而不稳定性仍是包晶石商业化的主要挑战。传统的封装粘合剂（如乙烯-醋酸乙烯酯和环氧树脂）受到高温工艺和潜在化学反应的限制，可能会损害包光体设备的效率。使用主要由聚二甲基硅氧烷（PDMS）组成的真空硅脂，不仅能使过氧化物设备免受湿气和氧气的影响，还能显著提高其功率转换效率，从 23.91% 提高到 25.34%。进一步的研究表明，这一改进可归因于 PDMS 中的氧原子与包晶结构中的铅之间形成了配位键。这种机制提高了效率，并抑制了 Pb0 缺陷的形成，而 Pb0 缺陷的形成是导致效率下降和不稳定的重要原因。在湿度≈90%的条件下，稳定性提高了十倍，这凸显了它作为一种低温、无损伤、有效的封装方法，在提高过氧化物太阳能电池的稳定性和性能方面的潜力。

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.