Ni/Si-based contact schemes based on the solid-phase regrowth process have been developed to form low-resistance ohmic contacts to GaN with a minimum contact resistivity of 1×10^{-3} Ωcm^{2} and ≈1×10^{-2} Ωcm^{2} to GaN:Si (n ≈ 2×10^{17} cm^{-3}) and GaN:Mg (p ≈ 3×10^{17} cm^{-3}). The solid-phase regrowth process responsible for the ohmic contact formation was studied using X-ray diffraction, secondary ion mass spectrometry and Rutherford backscattering spectrometry.
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