Equilibrium shapes and surface selection of nanostructures in 6H-SiC
Equilibrium shapes and surface selection of nanostructures in 6H-SiC
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DOI：
10.1063/1.4979550
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发表时间：
2017-04
影响因子：
4
通讯作者：
S. Kondo;C. Parish;T. Koyanagi;Y. Katoh
中科院分区：
文献类型：
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作者：
S. Kondo;C. Parish;T. Koyanagi;Y. Katoh
通过使用透射电子显微镜分析通过高温中子辐照在单晶 6H-SiC 中引入的纳米空隙（~10 nm）形状，研究了 6H-SiC 纳米结构及其表面的平衡形状。纳米空隙被确定为被截断的不规则二十面体，其中有 6 个 { 1 ´ 100}、12 个 { 1 ´ 103}、一个较小的顶部基底平面和一个较大的底部基底平面，这表明 { 1 ´ 100} 和 { 1 ´ 103} 是继基底平面之后的下一个稳定表面类别。纳米空隙中相对频繁地缺乏 { 1 ´ 100} 表面表明 ( 1 ´ 10 3 ´ ) 表面类型在能量上相当稳定。由于在 c 轴上产生了半晶胞高度的纳米面，这些非基底表面被发现不是原子平坦的。 { 1 ´ 100} 和 { 1 ´ 103} 表面根据其可能的纳米面和表面终止分别被分类为两种和四种面类型。我们还讨论了表面能差异......
The equilibrium shape of 6H-SiC nanostructures and their surfaces were studied by analyzing nano-void (∼10 nm) shapes, which were introduced in monocrystalline 6H-SiC by high-temperature neutron irradiation, using transmission electron microscopy. The nano-voids were determined to be irregular icosahedrons truncated with six { 1 ¯ 100}, twelve { 1 ¯ 103}, one smaller top-basal, and one larger bottom-basal planes, which suggests that { 1 ¯ 100} and { 1 ¯ 103} are the next stable surface class after the basal planes. The relatively frequent absence of the { 1 ¯ 100} surface in the nano-voids indicated that the ( 1 ¯ 10 3 ¯ ) surface type is energetically rather stable. These non-basal surfaces were found not to be atomically flat due to the creation of nanofacets with half unit-cell height in the c-axis. The { 1 ¯ 100} and { 1 ¯ 103} surfaces were classified as two and four face types according to their possible nanofacets and surface termination, respectively. We also discuss the surface energy difference ...