Title

MgZnO/AlGaN heterostructure light-emitting diodes

Authors

Authors

A. Osinsky; J. W. Dong; M. Z. Kauser; B. Hertog; A. M. Dabiran; P. P. Chow; S. J. Pearton; O. Lopatiuk;L. Chernyak

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

Physics, Applied

Abstract

We report on p-n junction light-emitting diodes fabricated from MgZnO/ZnO/AlGaN/GaN triple heterostructures. Energy band diagrams of the light-emitting diode structure incorporating piezoelectric and spontaneous polarization fields were simulated, revealing a strong hole confinement near the n-ZnO/p-AlGaN interface with a hole sheet density as large as 1.82x10(13) cm(-2) for strained structures. The measured current-voltage (IV) characteristics of the triple heterostructure p-n junctions have rectifying characteristics with a turn-on voltage of similar to3.2 V. Electron-beam-induced current measurements confirmed the presence of a p-n junction located at the n-ZnO/p-AlGaN interface. Strong optical emission was observed at similar to390 nm as expected for excitonic optical transitions in these structures. Experimental spectral dependence of the photocurrent confirmed the excitonic origin of the optical transition at 390 nm. Light emission was measured up to 650 K, providing additional confirmation of the excitonic nature of the optical transitions in the devices. (C) 2004 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

85

Issue/Number

19

Publication Date

1-1-2004

Document Type

Article

Language

English

First Page

4272

Last Page

4274

WOS Identifier

WOS:000224962800002

ISSN

0003-6951

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