MOMBE growth studies of GaN using metalorganic sources and N or NH/sub 3/

We have studied the MOMBE growth of GaN using a variety of metal-organic precursors including TMG, TEG and TIBG combined with atomic nitrogen from a plasma source or ammonia. The growth rate and morphology have been studied in-situ using optical reflectivity from the surface and the chemistry of the process has been investigated using in-situ mass spectrometry. Growth takes place in a custom designed system, which combines some of the features of CBE with other techniques more normally applied in Plasma assisted MOVPE. Details of the system have been published elsewhere. Due to the special geometry, growth takes place under molecular flow conditions to minimise gas phase interactions.