Synthesis and Characterization of Quaternary Monolayer Thick MoSe2/SnSe/NbSe2/SnSe Heterojunction Superlattices

详细信息    查看全文

• 作者：Richard D. Westover ; Jeffrey Ditto ; Matthias Falmbigl ; Zachary L. Hay ; David C. Johnson
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：27
• 期：18
• 页码：6411-6417
• 全文大小：508K
• ISSN：1520-5002

文摘

The synthesis of multiple-component heterostructures is conventionally accomplished through mechanical or chemical exfoliation, followed by physically stacking the layers together. Here, we report the synthesis, structure, and local composition of a three-component heterostructure (SnSe)_1.16(MoSe₂)_1.06(SnSe)_1.16(NbSe₂)₁, which was self-assembled at relatively low temperature (450 掳C) from a designed precursor. XRD and STEM studies showed that the compound consisted of alternating layers of trigonal prismatic MoSe₂ and NbSe₂, interleaved with SnSe layers in a distorted rock salt structure. The new three-component ferecrystal is metallic with a factor of 3 higher conductivity than the (SnSe)_1+未(Nb_xMo_1鈥?i>x)Se₂ ferecrystal alloy of the same composition (x 鈮?0.5). Comparison of the in-plane lattice parameters with the (SnSe)_1+未(Nb_xMo_1鈭?i>x)Se₂ alloys allowed the extent of interdiffusion of the dichalcogenide constituents to be evaluated, yielding a stoichiometry of (SnSe)_1.16([Mo_0.9Nb_0.1]Se₂)_1.06(SnSe)_1.16([Nb_0.9Mo_0.1]Se₂)₁.