Growth Mechanisms of Anisotropic Layered Group IV Chalcogenides on van der Waals Substrates for Energy Conversion Applications

被引:48
|
作者
Sutter, Peter [1 ]
Sutter, Eli [2 ]
机构
[1] Univ Nebraska Lincoln, Dept Elect & Comp Engn, Lincoln, NE 68588 USA
[2] Univ Nebraska Lincoln, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
来源
ACS APPLIED NANO MATERIALS | 2018年 / 1卷 / 06期
关键词
semiconductor; 2D crystal; low-energy electron microscopy; adsorption; van der Waals growth; anisotropy; EPITAXIAL GRAPHENE; TIN SULFIDE; SNS; FILMS; MONOSULFIDE; DEPOSITION; THICKNESS;
D O I
10.1021/acsanm.8b00660
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Two-dimensional group IV monochalcogenide semiconductors (SnX, GeX; X = S, Se) are of fundamental interest due to their anisotropic crystal structure and predicted unique characteristics such as very large exciton binding energies and multiferroic order possibly up to above room temperature. Whereas growth on reactive supports produces mostly standing flakes, deposition on van der Waals (vdW) substrates can yield basal-plane oriented layered crystals. But so far, this approach invariably resulted in flakes that are several atomic layers thick, and the synthesis of monolayers has remained elusive. Here, we use in situ microscopy during molecular beam epitaxy of SnS on graphite and graphene to establish the origin of this predominant multilayer growth. The enhanced reactivity of group IV chalcogenide layers causes adsorption of precursor molecules primarily on the initial SnS nuclei instead of the vdW support. On graphite, this unusual imbalance in the material supply is the primary cause for fast vertical growth. Experiments on graphene/Ru(0001) suggest increased adsorption on the vdW substrate, which enables enhanced lateral SnS growth. The fundamental insight obtained here provides a basis for identifying conditions for the scalable synthesis of single-layer group IV monochalcogenides and guides the growth of high-quality multilayer films of interest for applications in energy conversion, optoelectronics, and thermoelectrics.
引用
收藏
页码:3026 / 3034
页数:17
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