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Title: Heteroepitaxial ZnO films on diamond: Optoelectronic properties and the role of interface polarity

We demonstrate the growth of heteroepitaxial ZnO films on (110) diamond substrates by molecular beam epitaxy and report on a major advance in structural quality, as confirmed by XRD and high-resolution TEM measurements. The growth direction is found to be along the polar c-axis with Zn-polarity, deduced from annular bright-field scanning transmission electron microscopy imaging. This is important information, as simulations of the electronic band structure reveal the ZnO polarity to dominate the electronic structure of the interface: the formation of a two-dimensional electron gas on the ZnO side or a two-dimensional hole gas on the diamond side are predicted for Zn- and O-polarity, respectively. In addition, photoluminescence and absorption studies exhibit good optical properties and reveal stimulated emission for optical excitation above a threshold of 30 kW/cm{sup 2}.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Walter Schottky Institut, Technische Universität München, Am Coulombwall 4, 85748 Garching (Germany)
  2. Laboratorio de Microscopías Avanzadas (LMA) - Instituto de Nanociencia de Aragon (INA) and Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50018 Zaragoza (Spain)
  3. (Spain)
  4. Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus de la UAB, 08193 Bellaterra, CAT (Spain)
  5. (ICREA), 08010 Barcelona, CAT (Spain)
Publication Date:
OSTI Identifier:
22304250
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; CRYSTAL GROWTH; DIAMONDS; ELECTRON GAS; ELECTRONIC STRUCTURE; EXCITATION; FILMS; INTERFACES; MOLECULAR BEAM EPITAXY; OPTICAL PROPERTIES; PHOTOLUMINESCENCE; RESOLUTION; STIMULATED EMISSION; SUBSTRATES; TRANSMISSION ELECTRON MICROSCOPY; TWO-DIMENSIONAL CALCULATIONS; X-RAY DIFFRACTION; ZINC OXIDES