Direct evidence of metallicity at ZnO (000(1)over-bar)-(1x1) surfaces from angle-resolved photoemission spectroscopy

被引：33
|
作者：
Piper, L. F. J. [1 ]
Preston, A. R. H. [1 ]
Fedorov, A. [2 ]
Cho, S. W. [1 ]
DeMasi, A. [1 ]
Smith, K. E. [1 ]
机构：
[1] Boston Univ, Dept Phys, Boston, MA 02215 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 23期
关键词：
POLAR OXIDE SURFACES; ACCUMULATION; STABILITY; LAYERS;
D O I：
10.1103/PhysRevB.81.233305
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the stability of O-polar ZnO (000 (1) over bar)-(1x1) surfaces with photoemission spectroscopy and low-energy electron diffraction. We present direct evidence of quasi-two-dimensional electron gas (2DEG) formation (N-2D <= 2 x 10(13) cm(-2)) at the O-face from our angle-resolved photoemission spectroscopy studies. These findings are discussed in terms of hydrogenation of the O-face by chemisorptions process and the energetic location of the charge-neutrality level of ZnO. Our results reveal insight into the role of hydrogen in forming the quasi-2DEG and stabilizing the O-polar nonreconstructed surface.
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页数：4
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