Valence-band structure of the polar ZnO surfaces studied by angle-resolved photoelectron spectroscopy

被引：20

作者：

Ozawa, K. ^{[1
]}

Oba, Y. ^{[2
]}

Edamoto, K. ^{[2
]}

Higashiguchi, M. ^{[3
]}

Miura, Y. ^{[3
]}

Tanaka, K. ^{[3
]}

Shimada, K. ^{[4
]}

Namatame, H. ^{[4
]}

Taniguchi, M. ^{[3
,4
]}

机构：

[1] Tokyo Inst Technol, Dept Chem & Mat Sci, Meguro Ku, Tokyo 1528551, Japan

[2] Rikkyo Univ, Dept Chem, Toshima Ku, Tokyo 1718501, Japan

[3] Hiroshima Univ, Grad Sch Sci, Higashihiroshima 7398526, Japan

[4] Hiroshima Univ, Hiroshima Synchrotron Radiat Ctr, Higashihiroshima 7390046, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 07期

关键词：

ELECTRONIC-STRUCTURE; SOLID-SURFACES; WATER; PHOTOEMISSION; ZNO(0001)-ZN; STM;

D O I：

10.1103/PhysRevB.79.075314

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Valence-band structures of the polar ZnO surfaces, i.e., ZnO(0001)-Zn and ZnO(000 (1) over bar)-O, have been investigated by angle-resolved photoelectron spectroscopy utilizing synchrotron radiation. On the (1x1) O-terminated surface, surface-localized states forming dispersing bands with a (1x1) periodicity are identified at the upper portion of the valence-band region. The energetic position of these states and the fact that their photoemission intensities are sensitive to gas adsorption suggest that there is a contribution from the O 2p dangling-bond orbital of the surface O atoms. Comparing the valence-band structure of the (000 (1) over bar)-O surface with that of the (0001)-Zn surface, a deviation of the electronic structure in the near surface region from that in the bulk is found to be larger on (0001)-Zn than on (000 (1) over bar)-O. The role of the step structures, which exist on both polar surfaces but with much higher density on the (0001)-Zn surface, in the modification of the electronic structure is discussed.

引用

页数：7

共 29 条

[1] Ultrahigh vacuum three-axis cryogenic sample manipulator for angle-resolved photoelectron spectroscopy [J].