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Proceedings Paper

Growth and properties of nonpolar and polar MgZnO/ZnO quantum structures
Author(s): Hiroaki Matsui; Hitoshi Tabata
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Paper Abstract

Spectacular breakthroughs have been achieved in optoelectronics with the use of ZnO as a source for light-emitting diodes (LED) and quantum wells (QWs). In particular, atomically flat surfaces were obtained in Zn-polar growth, which led to the fabrication of Mg-rich Mg0.37Zn0.67O/ZnO QWs with sharp heterointerfaces between MgZnO and ZnO. μ-PL spectroscopy revealed that excitons were efficiently confined in the wells at room temperature. Excitonic emissions from Zn-polar QWs did not have a linear polarization effect, although polarized lights were clearly observed in M-nonpolar Mg0.12Zn0.88O/ZnO QWs. From the optical selection rule, the polarized lights of excitonic emissions were based on A- and C-excitonic transitions under Ec and E//c configurations. Furthermore, the anisotropic surface morphology was self-organized on the M-nonpolar ZnO layer surfaces, which allowed examination of the relationship between electron transport and surface morphology. The observed transport anisotropy correlated with the surface morphology. On the other hand, Zn-polar QWs resulted in isotropic electron transport because of two-dimensional surfaces. In this presentation, we introduce the detailed growth and various properties of Zn-polar and M-nonpolar QWs.

Paper Details

Date Published: 15 February 2010
PDF: 10 pages
Proc. SPIE 7603, Oxide-based Materials and Devices, 760307 (15 February 2010); doi: 10.1117/12.846068
Show Author Affiliations
Hiroaki Matsui, The Univ. of Tokyo (Japan)
Hitoshi Tabata, The Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 7603:
Oxide-based Materials and Devices
Ferechteh Hosseini Teherani; David C. Look; Cole W. Litton; David J. Rogers, Editor(s)

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