Cation In Situ Exchange for Fabrication of CsSnI3 Perovskite Solar Cells

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-06-02 DOI:10.1002/smll.202505188

Mingming Zhao, Ke‐jian Jiang, Kun Gong, Limei Wu, Dongzhi Liu, Xueqin Zhou, Yanlin Song

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引用次数: 0

Abstract

Inorganic CsSnI3 perovskite solar cells (PSCs) have attracted increasing research interest owing to their excellent optoelectronic properties and thermal stability. However, it is a great challenge to fabricate high‐quality CsSnI3 films with low defect density due to the quick crystallization growth rate and high content of Sn (II)‐related defects. Here, a cation in situ exchange strategy is employed for the fabrication of CsSnI3 perovskite films with tin iodide (SnI2), cesium formate (CsFa), and dimethylammonium iodide (DMAI) as the precursors, where DMASnI3 first forms and then transforms into black CsSnI3 during the thermal annealing, followed by the removal of dimethylamine and formic acid. The prepared CsSnI3 film exhibits high coverage and improved crystallinity with low defects, and the resultant PSC achieves a power conversion efficiency (PCE) of 12.62%, greater than the value (6.82%) for the traditional device with SnI2 and CsI as precursors. Moreover, the target device exhibits improved stability in an N2 environment, maintaining over 85% of its initial power conversion efficiency after 30 days. This cation exchange strategy paves the way to the realization of Sn‐based halide perovskite solar cells with high performance and stability.

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原位阳离子交换制备CsSnI3钙钛矿太阳能电池

无机CsSnI3钙钛矿太阳能电池（PSCs）由于其优异的光电性能和热稳定性引起了越来越多的研究兴趣。然而，由于晶体生长速度快，Sn （II）相关缺陷含量高，因此制备高质量、低缺陷密度的CsSnI3薄膜是一个很大的挑战。本文采用阳离子原位交换策略，以碘化锡（SnI2）、甲酸铯（CsFa）和二甲碘化铵（DMAI）为前驱体制备了CsSnI3钙钛矿薄膜，DMASnI3首先形成，然后在热退火过程中转化为黑色CsSnI3，然后去除二甲胺和甲酸。制备的CsSnI3薄膜具有高覆盖率、高结晶度和低缺陷的特点，所制备的PSC的功率转换效率（PCE）为12.62%，高于以SnI2和CsI为前驱体的传统器件的功率转换效率（PCE）（6.82%）。此外，目标器件在N2环境中表现出更好的稳定性，在30天后保持其初始功率转换效率的85%以上。这种阳离子交换策略为实现高性能稳定的锡基卤化物钙钛矿太阳能电池铺平了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.