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Proceedings Paper

Electronic structure of nitrogen-doped GaAs and GaP
Author(s): A. Mascarenhas; Yong Zhang
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Paper Abstract

The dilute nitrogen alloys GaAs1-xNx and GaP1-xNx have recently become technologically important for applications in high efficiency solar cells and vertical cavity surface emitting diode lasers used for fiber optic communications. There exist many inconsistencies between the results of various experimental techniques and theoretical models used to probe the giant band gap lowering observed in. these systems. It appears that these inconsistencies originate because GaAs1-xNx and GaP1-xNx should perhaps not be viewed as an abnormal alloys but rather as a heavy isoelectronically doped semiconductors. The similarity and dissimilarity between the two systems will be discussed with respect to: (1) The perturbation of the host band structure caused by nitrogen doping. (2) The evolution of nitrogen bound states with increasing nitrogen doping (3) The dominant contributors to the band edge absorption, and (4) Whether there exists a universal model that explains the anomalous behaviour of GaAs1-xNx and GaP1-XNX. Key issues such as the relevance of various theoretical band structure calculations to the experimentally measured parameters, and as to how exactly does one define the band gap for these materials will also be examined. Finally, possible solutions for regularizing the abnormal behavior of dilute N alloys will be discussed.

Paper Details

Date Published: 28 August 2002
PDF: 19 pages
Proc. SPIE 10303, Gallium-Nitride-based Technologies: A Critical Review, 103030D (28 August 2002); doi: 10.1117/12.482617
Show Author Affiliations
A. Mascarenhas, National Renewable Energy Lab. (United States)
Yong Zhang, National Renewable Energy Lab. (United States)

Published in SPIE Proceedings Vol. 10303:
Gallium-Nitride-based Technologies: A Critical Review
Marek Osinski, Editor(s)

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