Electron Band Structure And Properties Of
Disordered Semiconductor Compound Alloys
Author(s)
D. Alexandrov, K. S. A. Butcher & T. L. Tansley
Abstract
A new metric system called the electron metric system, having a basic metric
constant, is introduced. The connection between the electron metric system and
the external metric system is defined. The symmetry relationships of the
multinary semiconductor compound alloys are defined according to the electron
metric system. The basic metric constant is found on the basis of a diatomic
tetrahedral cell. The electron wave vector in the new system is found and the
electron energy states are determined. Correlation is shown between the electron
energy and the electron wave vector in the multinary crystal. The LCAO electron
band structures of InxAl1-xN are presented. The phenomenon tunnel optical
absorption is investigated in InxAl1-xN, in InxGa1-xN, in InN containing oxygen
and in non-stoichiometric InN. It is found the optical absorption edges begin in
energies much lower than the energy band gaps due to this phenomenon.
Existence of excitons of the structure is shown in these semiconductors and it is
found that the peaks of the PL spectra correspond to annihilation energies of
these excitons.
Keywords: semiconductor compound alloys, optical properties.
1 Introduction
The relatively recent observation of 0.7 eV photoluminescence for InN, and of
absorption features near this energy have been the subject of a number of recent
papers [1–3]. It has been proposed that the low energy features indicate a 0.7 eV
band-gap. However, the material had long been held to have a much higher
band-gap of 1.9 eV. The large difference between these values is not presently
understood. The Moss-Burstein effect does not explain the variation seen for
Keywords
semiconductor compound alloys, optical properties.
Related Book
Other papers in this volume
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