2009年2月
Valence-band structure of the polar ZnO surfaces studied by angle-resolved photoelectron spectroscopy
PHYSICAL REVIEW B
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- 巻
- 79
- 号
- 7
- 開始ページ
- 075314-1
- 終了ページ
- 075314-7
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.79.075314
- 出版者・発行元
- AMER PHYSICAL SOC
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.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.79.075314
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000263815800070