DOI: 10.1063/1.119949. Determination of the Al mole fraction and the band gap bowing of epitaxial AlxGa1−xN films

Determination of the Al mole fraction and the band gap bowing of epitaxial AlxGa1−xN films

10.1063/1.119949

Crossref journal-article

AIP Publishing

Applied Physics Letters (317)

Abstract

Al x Ga 1−x N alloys were grown on c-plane sapphire by plasma-induced molecular beam epitaxy. The Al content x was varied over the whole composition range (0⩽x⩽1). The molar Al fraction was deduced from x-ray diffraction and for comparison by elastic recoil detection analysis. The composition of the alloys calculated from the lattice parameter c underestimates x. This is due to a deformation of the unit cell. The exact Al mole fraction and the biaxial strain of the alloys can be calculated by an additional determination of a, using asymmetric reflections. The results obtained by x-ray diffraction and elastic recoil detection provide evidence for the validity of Vegard’s law in the AlGaN system. In addition, the deviation of the band gap from a linear dependence on x was investigated. We found a downward bowing with a bowing parameter b=1.3 eV.

Bibliography

Angerer, H., Brunner, D., Freudenberg, F., Ambacher, O., Stutzmann, M., HÃ¶pler, R., Metzger, T., Born, E., Dollinger, G., Bergmaier, A., Karsch, S., & KÃ¶rner, H.-J. (1997). Determination of the Al mole fraction and the band gap bowing of epitaxial AlxGa1âxN films. Applied Physics Letters, 71(11), 1504â1506.

Authors 12

H. Angerer (first)
D. Brunner (additional)
F. Freudenberg (additional)
O. Ambacher (additional)
M. Stutzmann (additional)
R. Höpler (additional)
T. Metzger (additional)
E. Born (additional)
G. Dollinger (additional)
A. Bergmaier (additional)
S. Karsch (additional)
H.-J. Körner (additional)

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Dates

Type	When
Created	23 years ago (July 26, 2002, 9:29 a.m.)
Deposited	1 year, 6 months ago (Feb. 3, 2024, 8:16 a.m.)
Indexed	4 weeks ago (July 24, 2025, 7:46 a.m.)
Issued	27 years, 11 months ago (Sept. 15, 1997)
Published	27 years, 11 months ago (Sept. 15, 1997)
Published Print	27 years, 11 months ago (Sept. 15, 1997)

Funders 0

None

BibTeX

@article{Angerer_1997, title={Determination of the Al mole fraction and the band gap bowing of epitaxial AlxGa1−xN films}, volume={71}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.119949}, DOI={10.1063/1.119949}, number={11}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Angerer, H. and Brunner, D. and Freudenberg, F. and Ambacher, O. and Stutzmann, M. and Höpler, R. and Metzger, T. and Born, E. and Dollinger, G. and Bergmaier, A. and Karsch, S. and Körner, H.-J.}, year={1997}, month=sep, pages={1504–1506} }

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