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(Color online) (a) HRTEM image and corresponding electron diffraction pattern along zone axis for ; (b) atomic resolution -contrast image along zone axis; (c) intensity profile of the -contrast image and Ga mole fraction along the axis from high spatial resolution EDS line scan (different region).
(Color online) (a) High-resolution XRD scan from showing small angle O 1 peak corresponding to the modulation period and two first-order satellite peaks O 2 and O 3 near (0002)AlGaN due to compositional modulation. Inset: Small angle XRD scansfor , 0.65, and 0.80. (b) Peak-normalized double-axis(0002)AlGaN and triple-axis (0002)AlGaN scans for , 0.50, and 0.80.
(Color online) (a) 12 K CL NBE spectra of for ; (b) calculated band gaps, calculated energies, and NBE peak energies measured by CL spectroscopy showing increasing Stokes shift with increasing AlN mole fraction.
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