Raman spectroscopy in layered hybrid organic-inorganic metal halide perovskites

IF 2.9 4区 物理与天体物理 Q2 OPTICS
Davide Spirito, Yaiza Asensio, L. Hueso, B. Martín‐García
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引用次数: 4

Abstract

The continuous progress in the synthesis and characterization of materials in the vast family of hybrid organic-inorganic metal halide perovskites (HOIPs) has been pushed by their exceptional properties mainly in optoelectronic applications. These works highlight the peculiar role of lattice vibrations, which strongly interact with electrons, resulting in coupled states affecting the optical properties. Among these materials, layered (2D) HOIPs have emerged as a promising material platform to address some issues of their three-dimensional counterparts, such as ambient stability and ion migration. Layered HOIPs consist of inorganic layers made of metal halide octahedra separated by layers composed of organic cations. They have attracted much interest not only for applications, but also for their rich phenomenology due to their crystal structure tunability. Here, we give an overview of the main experimental findings achieved via Raman spectroscopy in several configurations and set-ups, and how they contribute to shedding light on the complex structural nature of these fascinating materials. We focus on how the phonon spectrum comes from the interplay of several factors. First, the inorganic and organic parts, whose motions are coupled, contribute with their typical modes which are very different in energy. Nonetheless, the interaction between them is relevant, as it results in low-symmetry crystal structures. Then, the role of external stimuli, such as temperature and pressure, which induce phase transitions affecting the spectrum through change in symmetry of the lattice, octahedral tilting and arrangement of the molecules. Finally, the relevant role of the coupling between the charge carriers and optical phonons is highlighted.
层状杂化有机-无机金属卤化物钙钛矿的拉曼光谱
杂化有机-无机金属卤化物钙钛矿(HOIPs)材料的合成和表征不断取得进展,主要是由于其在光电应用方面的优异性能。这些工作强调了晶格振动的特殊作用,它与电子强烈相互作用,导致影响光学性质的耦合态。在这些材料中,层状(2D) hoip作为一种有前途的材料平台,可以解决三维材料的一些问题,如环境稳定性和离子迁移。层状hoip由金属卤化物八面体组成的无机层组成,由有机阳离子组成的层隔开。它们不仅在应用上引起了人们的兴趣,而且由于其晶体结构的可调性而具有丰富的现象学。在这里,我们概述了通过拉曼光谱在几种配置和设置中获得的主要实验发现,以及它们如何有助于揭示这些迷人材料的复杂结构性质。我们关注声子频谱是如何从几个因素的相互作用中产生的。首先,运动是耦合的无机部分和有机部分,它们的典型模式在能量上是非常不同的。尽管如此,它们之间的相互作用是相关的,因为它导致了低对称性的晶体结构。其次,温度和压力等外部刺激通过改变晶格的对称性、分子的八面体倾斜和排列来诱导相变对光谱的影响。最后,强调了载流子和光声子之间耦合的相关作用。
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来源期刊
CiteScore
3.00
自引率
48.10%
发文量
53
审稿时长
3 months
期刊介绍: This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.
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