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DOI	10.1039/c9ee03473k
	Molecular aspects of organic cations affecting the humidity stability of perovskites
	Kim B.; Seok S.I.
发表日期	2020
ISSN	1754-5692
起始页码	805
结束页码	820
卷号	13 期号:3
英文摘要	Two important factors in solar cells are efficiency and long-term stability. The commercialization of halide perovskite solar cells (PSCs) containing organic cations may be limited due to their low stability, in spite of their high efficiency. The molecular features of the organic cations adopted in perovksites belong to a subset of ammonium cations, such as methylammonium (MA), which are known to display poor humidity stability. Based on the molecular aspects of organic cations, the humidity stability of perovskites can be affected by their structural stability, the hydrophobicity, chemical environment near the heteroatom, and stereochemistry. Organic cations with large ionic radii produce two-dimensional (2D) structures with significantly improved stability. 2D perovskites show high humidity stability due to their increased chemical stability and hydrophobicity, but have the drawback of slow charge transport due to the insulating properties of the organic cations. Accordingly, many efforts have been devoted to form conductive inorganic layers in 2D perovskites in addition to the light-active layer of PSCs in several ways. In this perspective, we have analyzed the possible degradation initiators formed under humid conditions based on a comprehensive review of the literature, followed by practical experimental results using ammonium-driven PSCs, focusing on their humidity stability and device performance. As a strategy to enhance the wet-fastness of perovskites, we propose new under-explored sulfonium cations (R3S+), showing characteristic stereochemistry and significantly increased humidity stability of perovskites, which differ from conventional protic ammonium cations. © 2020 The Royal Society of Chemistry.
语种	英语
scopus关键词	Efficiency; Hydrophobicity; Perovskite; Perovskite solar cells; Positive ions; Stereochemistry; Stereoselectivity; Chemical environment; Device performance; Insulating properties; Long term stability; Molecular aspects; Molecular feature; Structural stabilities; Two dimensional (2D) structure; Chemical stability; cation; experimental study; fuel cell; humidity; molecular analysis; organic compound; perovskite
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162554
作者单位	Perovtronics Research Center, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, South Korea
推荐引用方式 GB/T 7714	Kim B.,Seok S.I.. Molecular aspects of organic cations affecting the humidity stability of perovskites[J],2020,13(3).
APA	Kim B.,&Seok S.I..(2020).Molecular aspects of organic cations affecting the humidity stability of perovskites.Energy and Environmental Science,13(3).
MLA	Kim B.,et al."Molecular aspects of organic cations affecting the humidity stability of perovskites".Energy and Environmental Science 13.3(2020).