TY - JOUR
T1 - Lattice relaxation of ZnO single crystal (0001) surface
AU - Maki, Hideyuki
AU - Ichinose, Noboru
AU - Ohashi, Naoki
AU - Haneda, Hajime
AU - Tanaka, Junzo
N1 - Funding Information:
The authors thank Mr S. Sekiguchi of Taiyo Yuden Co. Ltd., Japan, for helpful assistance on the AFM and CAICISS measurements. The authors also express their thanks for helpful suggestions by Dr R. Souda and Dr Suzuki of NIRIM, Japan. This study was supported by a Special Coordination Fund from the Science and Technology Agency, Japan.
PY - 2000/6/10
Y1 - 2000/6/10
N2 - Wurtzite-type ZnO is a polar crystal whose (0001) surface is terminated by Zn ions. The ZnO single crystals were etched for the surfaces to have regular step/terrace structures and analyzed by reflection high-energy electron diffraction (RHEED) and coaxial impact-collision ion scattering spectroscopy (CAICISS). RHEED patterns showed that the surface had a 1×1 structure. From the polar angle dependence of CAICISS time-of-flight spectra for Zn ions, a peak due to a focusing effect for fifth-layer Zn ions by the first-layer Zn ions was observed at 49.5°, which was 2° higher than the corresponding angle simulated for a non-relaxed surface. These results indicated that the uppermost Zn ions were surface-normally relaxed toward the outside of the surface by about 7% of the c-axis lattice constant.
AB - Wurtzite-type ZnO is a polar crystal whose (0001) surface is terminated by Zn ions. The ZnO single crystals were etched for the surfaces to have regular step/terrace structures and analyzed by reflection high-energy electron diffraction (RHEED) and coaxial impact-collision ion scattering spectroscopy (CAICISS). RHEED patterns showed that the surface had a 1×1 structure. From the polar angle dependence of CAICISS time-of-flight spectra for Zn ions, a peak due to a focusing effect for fifth-layer Zn ions by the first-layer Zn ions was observed at 49.5°, which was 2° higher than the corresponding angle simulated for a non-relaxed surface. These results indicated that the uppermost Zn ions were surface-normally relaxed toward the outside of the surface by about 7% of the c-axis lattice constant.
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U2 - 10.1016/S0039-6028(00)00436-2
DO - 10.1016/S0039-6028(00)00436-2
M3 - Article
AN - SCOPUS:0034630984
SN - 0039-6028
VL - 457
SP - 377
EP - 382
JO - Surface Science
JF - Surface Science
IS - 3
ER -