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DOI	10.1021/acsenergylett.9b02490
	Origin of Broad-Band Emission and Impact of Structural Dimensionality in Tin-Alloyed Ruddlesden-Popper Hybrid Lead Iodide Perovskites
	Li T.; Chen X.; Wang X.; Lu H.; Yan Y.; Beard M.C.; Mitzi D.B.
发表日期	2020
ISSN	23808195
起始页码	347
结束页码	352
英文摘要	Hybrid organic-inorganic lead halide perovskites have shown promising results as active layers in light-emitting diodes, typically utilizing the near-monochromatic, free exciton emission. Some perovskite compounds, however, show broad-band emission that is more intense than the free exciton counterpart. In this study, we show that the light emission properties of Ruddlesden-Popper hybrid perovskites PEA2MAn-1PbnI3n+1 (PEA = phenethylammonium, MA = methylammonium) can be tuned by Sn alloying and are highly sensitive to Sn %. With increasing dimensionality, the broad-band emission quantum yield decreases drastically, from 23% in n = 1 to <1% for the n = 3 compound. Using density functional theory calculations and transient reflectance spectroscopy, the broad emission is identified as originating from self-trapped excitons. A dynamic picture of the formation process is also presented, for which ultrafast (<5 ps) hole-trapping at the Sn site is the first step, followed by electron localization from Coulombic interaction. These findings are especially valuable for designing perovskite materials with intense room-temperature broad-band emission for solid-state lighting applications. American Chemical Society.
scopus关键词	Density functional theory; Excitons; Iodine compounds; Layered semiconductors; Lighting; organic-inorganic materials; Perovskite; Tin alloys; Coulombic interactions; Electron localizations; Free-exciton emissions; Hybrid organic-inorganic; Light emission properties; Self trapped excitons; Solid-state lighting application; Transient reflectance; Lead compounds
来源期刊	ACS Energy Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177029
作者单位	Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, United States; Department of Chemistry, Duke University, Durham, NC 27708, United States; Chemistry and Nano Science Center, National Renewable Energy Laboratory, Golden, CO 80401, United States; Department of Physics and Astronomy and Wright, Center for Photovoltaics Innovation and Commercialization, University of Toledo, Toledo, OH 43606, United States
推荐引用方式 GB/T 7714	Li T.,Chen X.,Wang X.,et al. Origin of Broad-Band Emission and Impact of Structural Dimensionality in Tin-Alloyed Ruddlesden-Popper Hybrid Lead Iodide Perovskites[J],2020.
APA	Li T..,Chen X..,Wang X..,Lu H..,Yan Y..,...&Mitzi D.B..(2020).Origin of Broad-Band Emission and Impact of Structural Dimensionality in Tin-Alloyed Ruddlesden-Popper Hybrid Lead Iodide Perovskites.ACS Energy Letters.
MLA	Li T.,et al."Origin of Broad-Band Emission and Impact of Structural Dimensionality in Tin-Alloyed Ruddlesden-Popper Hybrid Lead Iodide Perovskites".ACS Energy Letters (2020).