1999
DOI: 10.1063/1.123339
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The band-gap bowing of AlxGa1−xN alloys

Abstract: The band gap of AlxGa1−xN is measured for the composition range 0⩽x<0.45; the resulting bowing parameter, b=+0.69 eV, is compared to 20 previous works. A correlation is found between the measured band gaps and the methods used for epitaxial growth of the AlxGa1−xN: directly nucleated or buffered growths of AlxGa1−xN initiated on sapphire at temperatures T>800 °C usually lead to stronger apparent bowing (b>+1.3 eV); while growths initiated using low-temperature buffers on sapphire, followed… Show more

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Cited by 176 publications
(99 citation statements)
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References 32 publications
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“…Both LDA and sX-LDA bowing parameters are quite small and are within the experimentally measured range of 0.6 -1.0 eV. [19][20][21] Although the experimental discrepancy in the measured bowing parameter prevents us from making a more precise comparison, we can conclude that the calculated sX-LDA and LDA bowing parameters are similar and that they are both close to experiment. From the similarity of the sX-LDA and LDA results we infer that there are no serious consequences due to the band gap error of LDA in the bowing parameter calculations of these systems and also that sX-LDA can be reliably applied to this alloy system.…”
mentioning
confidence: 52%
“…Both LDA and sX-LDA bowing parameters are quite small and are within the experimentally measured range of 0.6 -1.0 eV. [19][20][21] Although the experimental discrepancy in the measured bowing parameter prevents us from making a more precise comparison, we can conclude that the calculated sX-LDA and LDA bowing parameters are similar and that they are both close to experiment. From the similarity of the sX-LDA and LDA results we infer that there are no serious consequences due to the band gap error of LDA in the bowing parameter calculations of these systems and also that sX-LDA can be reliably applied to this alloy system.…”
mentioning
confidence: 52%
“…A wide spectrum of bandgap bowing parameters has been obtained for ternary nitride alloys due to differences in growth and measurement conditions [9,10]. For unstrained layers with low mole fraction of the alloy element (x < 0.2), we employ the following roomtemperature relations for the direct bandgap [ eV]: E g ðIn x Ga 1Àx NÞ ¼ 1:89x þ 3:42ð1 À xÞ À 3:8xð1 À xÞ ð1Þ E g ðAl x Ga 1Àx NÞ ¼ 6:28x þ 3:42ð1 À xÞ À 1:3xð1 À xÞ ð2Þ…”
Section: Laser Model and Materials Parametersmentioning
confidence: 99%
“…8,9 Al 1−x Ga x N and Al 1−x In x N are well suited materials as photodetectors in the ultraviolet ͑UV͒ spectrum. 10 Many experimental and theoretical studies have been performed on the wurtzite structure of these ternary alloys, [11][12][13] but not much work has been done on the zinc-blende phase, since its successful growth. [14][15][16] The investigation of zinc-blende structure of these materials is more important than wurtzite structure due to its large optical gain and lower threshold current density.…”
Section: Introductionmentioning
confidence: 99%