Synthesis and Systematic Trends in Structure and Electrical Properties of [(SnSe)1.15]m(VSe2)1, m = 1, 2, 3, and 4

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• 作者：Ryan Atkins ; Michelle Dolgos ; Andreas Fiedler ; Corinna Grosse ; Saskia F. Fischer ; Sven P. Rudin ; David C. Johnson
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：May 13, 2014
• 年：2014
• 卷：26
• 期：9
• 页码：2862-2872
• 全文大小：503K
• 年卷期：v.26,no.9(May 13, 2014)
• ISSN：1520-5002

文摘

Four compounds [(SnSe)b>1.15b>]b>mb>(VSeb>2b>)b>1b>, where m = 1鈥?, were synthesized to explore the effect of increasing the distance between Se鈥揤鈥揝e dichalcogenide layers on electrical transport properties. These kinetically stable compounds were prepared using designed precursors that contained a repeating pattern of elemental layers with the nanoarchitecture of the desired product. XRD and STEM data revealed that the precursors self-assembled into the desired compounds containing a Se鈥揤鈥揝e dichalcogenide layer precisely separated by a SnSe layer. The 00l diffraction data are used to determine the position of the Sn, Se, and V planes along the c-axis, confirming that the average structure is similar to that observed in the STEM images, and the resulting data agrees well with results obtained from calculations based on density functional theory and a semiempirical description of van der Waals interactions. The in-plane diffraction data contains reflections that can be indexed as hk0 reflections coming from the two independent constituents. The SnSe layers diffract independently from one another and are distorted from the bulk structure to lower the surface free energy. All of the samples showed metallic-like behavior in temperature-dependent resistivity between room temperature and about 150 K. The electrical resistivity systematically increases as m increases. Below 150 K the transport data strongly indicates a charge density wave transition whose onset temperature systematically increases as m increases. This suggests increasing quasi-two-dimensional behavior as increasingly thick layers of SnSe separate the Se鈥揤鈥揝e layers. This is supported by electronic structure calculations.