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arXiv 2007.14167cond-mat.mtrl-sci
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溶剂蒸发法生长过渡金属二硫属化合物

Growth of Transition Metal Dichalcogenides by Solvent Evaporation Technique

Dmitriy A. Chareev, Polina V. Evstigneeva, Dibya Phuyal, Gabriel Man, Hakan Rensmo, Alexander N. Vasiliev, Mahmoud Abdel-Hafiez

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12 pages, 10 figures
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摘要：

过渡金属二硫属化合物（transition metal dichalcogenides，TMD）由于其物理性质和在能量转换和储存方面的潜在应用，近年来引起了人们极大的兴趣。在这类材料中，基于钼、钨、硫和硒的TMD由于其半导体性质和自下而上合成技术的可用性而特别有吸引力。本文报道了一种从金属饱和的硫族熔体中通过气相沉积从过渡金属二硒化物和二碲化物化合物（PtTe 2、PdTe 2、NiTe 2、TaTe 2、TiTe 2、RuTe 2、PtSe 2、PdSe 2、NbSe 2、TiSe 2、VSe 2、ReSe 2）的固溶体中获得高质量晶体的方法。此外，我们显示的稀土金属多硫族化物和NbS 2晶体的合成使用上述过程。大多数得到的晶体具有层状CdI 2结构。我们已经调查了选定的晶体的物理性质，并将它们与文献中报道的最先进的研究结果进行了比较。值得注意的是，1 T-TiSe 2和2 H-NbSe 2晶体中的电荷密度波跃迁分别在TCDW ~ 200 K和~ 33 K下是明确的。角分辨光电子能谱学和电子衍射用于直接访问PtTe 2单晶的电子和晶体结构，并产生最先进的测量。

英文摘要：

Due to their physical properties and potential applications in energy conversion and storage, transition metal dichalcogenides (TMDs) have garnered substantial interest in recent years. Amongst this class of materials, TMDs based on molybdenum, tungsten, sulfur and selenium are particularly attractive due to their semiconducting properties and the availability of bottom-up synthesis techniques. Here we report a method which yields high quality crystals of transition metal diselenide and ditelluride compounds (PtTe2, PdTe2, NiTe2, TaTe2, TiTe2, RuTe2, PtSe2, PdSe2, NbSe2, TiSe2, VSe2, ReSe2) from their solid solutions, via vapor deposition from a metal-saturated chalcogen melt. Additionally, we show the synthesis of rare-earth metal poly-chalcogenides and NbS2 crystals using the aforementioned process. Most of the obtained crystals have a layered CdI2 structure. We have investigated the physical properties of selected crystals and compared them to state-of-the-art findings reported in the literature. Remarkably, the charge density wave transition in 1T-TiSe2 and 2H-NbSe2 crystals is well-defined at TCDW ~ 200 K and ~ 33 K, respectively. Angle-resolved photoelectron spectroscopy and electron diffraction are used to directly access the electronic and crystal structures of PtTe2 single crystals, and yield state-of-the-art measurements.

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