Figure 25

(a) Phase diagram for the GaN(0001) surface in the presence of H, as a function of µ_Ga and µ_H. µ_H = 0 corresponds to H molecules at T=0; µ_Ga = 0 corresponds to bulk Ga. Dots indicate experimental data from Ref. [14]; within the error bars, these data agree with the calculated NH₃ + 3Ga-H / 3Ga-H phase boundary highlighted by the thicker line. Note that the V_Ga + 6H structure is stoichiometrically and energetically equivalent to NH₃ + 3Ga-H. (b) temperature dependence of µ_H for two different pressures. (From [80]).

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