Absorption and photoluminescence features caused by defects in InN

Linear combination of atomic orbitals electron band structure calculations are used to examine the influence of common defect structures that may arise as artifacts during the growth of InN. For 1.9 eV band gap InN, the formation of indium rich In x Al 1− x N or In x Ga 1− x N interfacial layers res...

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Bibliographic Details
Published in:Journal of crystal growth 2004-08, Vol.269 (1), p.77-86
Main Authors: Alexandrov, Dimiter, Butcher, K.Scott A., Wintrebert-Fouquet, Marie
Format: Article
Language:English
Subjects:
B1. Nanomaterials
B1. Nitrides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Iii-v semiconductors
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Photoluminescence
Physics
Semiconductors
Visible and ultraviolet spectra
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Summary:Linear combination of atomic orbitals electron band structure calculations are used to examine the influence of common defect structures that may arise as artifacts during the growth of InN. For 1.9 eV band gap InN, the formation of indium rich In x Al 1− x N or In x Ga 1− x N interfacial layers results in lower band-gap material. Exciton emissions at energies as low as 0.765–0.778 eV for In x Al 1− x N, and as low as 0.50–0.82 eV for In x Ga 1− x N are calculated, which are consistent with the recent observations of luminescence in InN. Optical absorption features are shown to also occur at energies that would interfere with band-gap measurements. The role of oxygen alloying was also examined, and the ternary semiconductor InO y N 1− y with y∼0.1 was identified. It was also found that the presence of this concentration of O atoms in InN decreases the band gap energy. Optical absorption as low as 1.19 eV can be evident, while exciton emissions were found to vary in energy over the range 0.84–1.01 eV. This work suggests that oxygen alloys play no role in raising any supposedly smaller band gap of InN to the observed 1.9 eV.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2004.05.036