Abstract:
Specific features of gallium nitride (GaN) selective growth by MOVPE in round windows has been studied. It is established that a decrease in the flux of ammonia results in an increase in the lateral size of crystallites, while the minimum studied fluxes lead to a decrease in the height of crystallites and the formation of (0001) and $\{1\bar100\}$ facets in addition to the usual $\{1\bar101\}$ facets. The phenomenon of growth suppression was observed for a fraction of crystallites at the onset of their coalescence. In addition, selective growth was suppressed near large nonmasked surface regions.