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A Study of Indium Nitride Films Grown Under Conditions Resulting in Apparent Band-gaps from 0.7 eV to 2.3 eV

Published online by Cambridge University Press:  11 February 2011

K. S. A. Butcher ,
M. Wintrebert-Fouquet ,
Motlan ,
S. K. Shrestha ,
H. Timmers ,
K. E. Prince  and
T. L. Tansley
K. S. A. Butcher
Affiliation:
Physics Department, Macquarie University, Sydney, NSW 2109, Australia.
M. Wintrebert-Fouquet
Affiliation:
Physics Department, Macquarie University, Sydney, NSW 2109, Australia.
Motlan
Affiliation:
Department of Physics, Faculty of Mathematics and Science, State University of Medan, Indonesia.
S. K. Shrestha
Affiliation:
School of Physics, University of New South Wales at the Australian Defence Force Academy, Canberra, ACT 2600, Australia.
H. Timmers
Affiliation:
School of Physics, University of New South Wales at the Australian Defence Force Academy, Canberra, ACT 2600, Australia. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian, National University, Canberra, ACT 0200, Australia.
K. E. Prince
Affiliation:
Australian Nuclear Science and Technology Organisation, Private Mail Bag 1, Menai NSW 2234, Australia.
T. L. Tansley
Affiliation:
Physics Department, Macquarie University, Sydney, NSW 2109, Australia.
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Abstract

The band-gap of indium nitride has long been believed to be about 1.9eV with slight variations due to band-tailing in polycrystalline samples and degenerate doping. Recently, other values as low as 0.7 eV have apparently been observed. We have compared samples spanning this apparent range of band-gap using secondary ion mass spectroscopy (SIMS), X-ray Photoelectron Spectroscopy (XPS) and heavy ion elastic recoil detection analysis (ERDA), in conjunction with spectral optical density measurements. Once structural inhomogeneiteies are taken into account, we show that much of the conflicting data are compatible with direct photoionisation with a threshold energy of about 1.0eV. This feature was first reported in polycrystalline indium nitride over 15 years ago and attributed to a ∣p> like defect state. We ask whether the feature may instead be a direct band-gap.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 743: Symposium L – GaN and Related Alloys , 2002 , L11.23
Copyright
Copyright © Materials Research Society 2003

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References

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