Temperature−Dependent Raman Scattering Investigation on vdW Epitaxial PbI2/CrOCl Heterostructure
Temperature−Dependent Raman Scattering Investigation on vdW Epitaxial PbI2/CrOCl Heterostructure
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DOI：
10.3390/cryst13010104
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发表时间：
2023-01
期刊：
影响因子：
2.7
通讯作者：
S. You;Xiao Guo;Junjie Jiang;Dingbang Yang;Mingjun Li;Fangping Ouyang;Haipeng Xie;Han Huang
中科院分区：
文献类型：
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作者：
S. You;Xiao Guo;Junjie Jiang;Dingbang Yang;Mingjun Li;Fangping Ouyang;Haipeng Xie;Han Huang
货车德瓦耳斯（vdW）外延生长提供了制备具有原子和电子尖锐界面的异质结构的有效策略。在此，PbI 2在高真空中原位热沉积到剥离的薄层CrOCl纳米片上，以制造VdW PbI 2/CrOCl异质结构。光学显微镜、原子力显微镜、X射线衍射和温度依赖的拉曼光谱被用来研究异质结构的结构特性和声子行为。在CrOCl衬底上的PbI 2薄膜的形貌明显依赖于衬底温度，从半球形颗粒转变为具有平坦顶面的2D纳米片。此外，在PbI_2/CrOCl异质结中首次观察到Ag_1和Au_2模随温度升高的反常蓝移现象。我们的研究结果为vdW异质结构提供了一种新的材料平台，并为优化异质结构生长行为提供了一种可能的方法。
Van der Waals (vdW) epitaxial growth provides an efficient strategy to prepare heterostructures with atomically and electronically sharp interfaces. Herein, PbI2 was in situ thermally deposited onto exfoliated thin−layered CrOCl nanoflakes in high vacuum to fabricate vdW PbI2/CrOCl heterostructures. Optical microscopy, atomic force microscopy, X−ray diffraction, and temperature−dependent Raman spectroscopy were used to investigate the structural properties and phonon behaviors of the heterostructures. The morphology of PbI2 films on the CrOCl substrate obviously depended on the substrate temperature, changing from hemispherical granules to 2D nanoflakes with flat top surfaces. In addition, anomalous blueshift of the Ag1 and Au2 modes as the temperature increased in PbI2/CrOCl heterostructure was observed for the first time. Our results provide a novel material platform for the vdW heterostructure and a possible method for optimizing heterostructure growth behaviors.