Raman spectroscopy in layered hybrid organic-inorganic metal halide perovskites

拉曼光谱 卤化物 化学物理 声子 材料科学 晶体结构 八面体 分子振动 金属 光谱学 纳米技术 化学 结晶学 无机化学 凝聚态物理 光学 物理 量子力学 冶金
作者
Davide Spirito,Yaiza Asensio,Luis E. Hueso,Beatriz Martín‐García
出处
期刊:JPhys materials [IOP Publishing]
卷期号:5 (3): 034004-034004 被引量:16
标识
DOI:10.1088/2515-7639/ac7977
摘要

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.
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