Experimental X-ray rocking curves of m-plane ammonothermal GaN.
μ-Raman spectra for different configurations of the incident and scattered light and its polarization in the range of the LPP−, A1(TO), E1(TO), and E2(high) modes.
Cathodoluminescence spectra for excitation power densities between 10 kW/cm2 and 10 MW/cm2 at T = 10 K between 1.7 eV and 3.6 eV and high resolution spectra of the near band-edge luminescence (a). Peak intensities as function of excitation power density in a double logarithmic scale (b).
Experimental values of lattice spacings dhkl for various Bragg reflections (hkl). Values in brackets are the errors in the last digits.
Experimental a and c lattice parameters for ammonothermal, HPSG, and HVPE GaN. Values in brackets are the errors in the last digits.
Peak positions and full width at the half maximum values for the observed Raman modes at 300 K. Values in brackets are the errors in the last digit.
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