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(a) Schematic sample structure of -doped GaN and (b) in situ reflectometry spectrum acquired at during growth. The spectrum shows periodic features corresponding to the Mg incorporation (circle).
(Color online) (a) Depth profile of Mg concentration obtained by SIMS measurement showing periodic variations (b) of the doping concentration. Inset in (a): linear relation between the Mg concentration and .
(a) Hole concentrations as a function of temperature and calculated activation energies. (b) Acceptor, , and compensating donor, , concentrations and SIMS measured Mg concentration as a function of .
(Color online) Contour plot of PL spectra. given as a function of energy. The full vertical lines mark the positions of the spectra. The color scale refers to the PL intensity.
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