Zn vacancies creation via (2 x 2) surface reconstruction
Zn vacancies creation via (2 x 2) surface reconstruction
复制标题
通过 (2 x 2) 表面重建产生锌空位
DOI：
10.1088/1361-6463/aa7b07
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发表时间：
2017-08-16
影响因子：
3.4
通讯作者：
Shen, Dezhen
中科院分区：
文献类型：
--
作者：
Xie, Xiuhua;Li, Binghui;Shen, Dezhen
在外延生长过程中，锌空位通过（2 × 2）表面重构被引入ZnO中。原位反射高能电子衍射（RHEED）图案的演变表明，锌极性表面（2 × 2）重建实现极端富氧条件下。高分辨率扫描隧道显微镜（STM）图像显示了原子大小的三角形坑和岛，代表每个（2 × 2）表面单元格中有一个Zn空位。用变温功率稳态光致发光（PL）谱研究了Zn空位的中性受主束缚激子（A（0），X）峰和红色发光（RL）峰，其最大发光强度约为1.76eV，与Zn空位有关。
Zinc vacancies have been incorporated in ZnO via (2 x 2) surface reconstruction during the epitaxy growth. Evolution of in situ reflection high-energy electron diffraction (RHEED) patterns indicate Zn-polar surface (2 x 2) reconstruction was realized under extreme O-rich conditions. Atom sized triangular pits and islands were presented by the high resolution scanning tunneling microscopy (STM) images, which stand for a single Zn vacancy per (2 x 2) surface unit cell. The neutral acceptor-bound exciton (A(0), X), peak located at 3.344eV, and red luminescence (RL), maximum emission intensity at similar to 1.76eV, which related to Zn vacancy, have been studied by variable-temperature/power steady-state photoluminescence (PL) spectroscopy.