Structure determination of the Si3N4/Si(111)-(8 x 8) surface:: A combined study of Kikuchi electron holography, scanning tunneling microscopy, and ab initio calculations

被引：61
|
作者：
Ahn, H [1 ]
Wu, CL
Gwo, S
Wei, CM
Chou, YC
机构：
[1] Natl Tsing Hua Univ, Dept Phys, Hsinchu 300, Taiwan
[2] Acad Sinica, Inst Phys, Taipei 115, Taiwan
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.86.2818
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A comprehensive atomic model for the reconstructed surface of Si3N4 thin layer grown on Si(lll) is presented. Kikuchi electron holography images clearly show the existence of adatoms on the Si3N4(0001)/Si(111)-(8 x 8) surface. Compared with the nb initio calculations, more than 30 symmetry-inequivalent atomic pairs in the outmost layers are successfully identified. Scanning tunneling microscopy (STM) images show diamond-shaped unit cells and nine adatoms in each cell. High-resolution STM images reveal extra features and are in good agreement with the partial charge density distribution obtained from total-energy calculations.
引用
收藏
页码：2818 / 2821
页数：4
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