Terbium induced nanostructures on Si(111)
Terbium induced nanostructures on Si(111)
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DOI：
10.1016/j.susc.2015.03.026
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发表时间：
2015-07-01
期刊：
影响因子：
1.9
通讯作者：
Daehne, M.
中科院分区：
文献类型：
--
作者：
Franz, M.;Grosse, J.;Daehne, M.
用扫描隧道显微镜研究了Tb诱导的自组装纳米结构在Si（111）表面的生长。根据不同的生长条件，三个制度被确定在其中出现不同类型的纳米结构。在非常低的Tb覆盖率和适度的生长温度下，Si（111）表面的7 × 7周期性保持完整，并且在单个7 × 7半晶胞内形成魔团簇。在中间制度的Tb覆盖率低于一个单层，观察到不同的超结构的形成。在这里，一个链状的5 × 2超结构，2根3 × 2根3 R30度的超结构，和细长的岛屿显示2 × 1重建的顶部被found.From一个详细的研究5 × 2超结构表明，它是由交替的Si Seiwatz和Si蜂窝链与排之间的通道中的Tb原子。此外，Tb行之间的登记移位导致该超结构的不同配置。在覆盖率超过一个单层，二维TbSi2单层和三维Tb3Si5多层膜的岛屿的生长占主导地位。(C)2015爱思唯尔B.V.保留所有权利。
The growth of self-assembled Tb induced nanostructures on the Si(111) surface is investigated using scanning tunneling microscopy. Depending on the growth conditions, three regimes are identified in which different types of nanostructures appear. At very low Tb coverages and moderate growth temperatures, the 7 x 7 periodicity of the Si(111) surface remains intact and magic clusters form within single 7 x 7 half unit cells. In the intermediate regime of Tb coverages below one monolayer, the formation of different superstructures is observed. Here, a chain-like 5 x 2 superstructure, a 2 root 3 x 2 root 3 R30 degrees superstructure, and elongated islands showing a 2 x 1 reconstruction on top are found. From a detailed study of the 5 x 2 superstructure it is demonstrated that it consists of alternating Si Seiwatz and Si honeycomb chains with rows of Tb atoms in the channels in between. Moreover, registry shifts between the Tb rows lead to different configurations of this superstructure. At coverages exceeding one monolayer, the growth of islands of two-dimensional TbSi2 monolayers and three-dimensional Tb3Si5 multilayers dominates. (C) 2015 Elsevier B.V. All rights reserved.