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Bandgap in Al1− x Sc x N
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View: Figures


Image of FIG. 1.
FIG. 1.

XRD results from Al1− x Sc x N layers deposited on saphire 0001. (a)θ–2θ spectra showing the wurtzite phase 0002 and the rock-salt phase 111 peaks for x = 0.0, 0.09, 0.20, and 0.45, (b) assymetric ω-2θ scans showing the wurztite phase reflection for x = 0.0, 0.09, and 0.20, (c) measured in-plane a and out-of-plane c lattice constants of the wurtzite phase. The lines indicate the linear trends for x ≤ 0.16.

Image of FIG. 2.
FIG. 2.

(a) Measured absorption coefficient α vs. photon energy hυ for Al1− x Sc x N layers with x = 0.0–0.45. The dashed lines indicate a linear increase in the sub-bandgap absorption. (b) Plot of the slope dα/d(hυ) from the lines in (a). The lines through the data points indicate the two linear regimes above and below x = 0.20.

Image of FIG. 3.
FIG. 3.

Band gap Eg of Al1− x Sc x N as determined from the optical absorption coefficient α. The squares are obtained using the Tauc plot, as illustrated in the inset for x = 0.022. The circles correspond to the photon energy for which α = 7 × 104 cm−1.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bandgap in Al1−xScxN