“…The use of a surfactant is one option for reducing surface roughness for higher concentrations of nitrogen. Antimony is one option as a surfactant [1,2], and recently bismuth has begun to attract attention as a potential surfactant for dilute nitride growth [3,4]. A recent study [3] also indicates that bismuth may dramatically alter N incorporation besides acting as a surfactant, although this study only considered low (0.4-0.95%) nitrogen concentrations.…”