ZnO and related materials: Plasma-assisted molecular beam epitaxial growth, characterization, and application

S. K. Hong, Y. Chen, H. J. Ko, H. Wenisch, T. Hanada, T. Yao

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

This paper will address features of plasma-assisted molecular beam epitaxial growth of ZnO and related materials and their characteristics. Two-dimensional, layer-by-layer growth is achieved both on c-plane sapphire by employing MgO buffer layer growth and on (0001) GaN/Al2O3 template by predepositing a low-temperature buffer layer followed by high-temperature annealing. Such two-dimensional growth results in the growth of high-quality heteroepitaxial ZnO epilayers. Biexciton emission is obtained from such high quality epilayers. The polarity of heteroepitaxial ZnO epilayers is controlled by engineering the heterointerfaces. We achieved selective growth of Zn-polar and O-polar ZnO heteroepitaxial layers. The origin of different polarities can be successfully explained by an interface bonding sequence model. N-type conductivity in Ga-doped ZnO epilayers is successfully controlled. High conductivity, enough to be applicable to devices, is achieved. MgxZn1-xO/ZnO heterostructures are grown and emission from a ZnO quantum well is observed. Mg incorporation in a MgZnO alloy is determined by in-situ reflection high-energy electron diffraction intensity oscillations, which enables precise control of the composition. Homoepitaxy on commercial ZnO substrates has been examined. Reflection high-energy electron diffraction intensity oscillations during homoepitaxy growth are observed.

Original languageEnglish
Pages (from-to)647-658
Number of pages12
JournalJournal of Electronic Materials
Volume30
Issue number6
DOIs
Publication statusPublished - 2001 Jun

Keywords

  • Heterointerface
  • Heterostructure
  • Interface engineering
  • MgZnO/ZnO
  • Plasma-assisted molecular beam epitaxy (P-MBE)
  • Polarity control
  • ZnO
  • ZnO-related materials
  • ZnO/GaN

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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