Lattice relaxation of ZnO single crystal (0001) surface

Hideyuki Maki, Noboru Ichinose, Naoki Ohashi, Hajime Haneda, Junzo Tanaka

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
JournalSurface Science
Volume457
Issue number3
DOIs
Publication statusPublished - 2000 Jun 10
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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