Ammonia and at least one of triethylaluminum and trimethylaluminum are fed to the reactor while the substrate is at {HEAD ~ a temperature} of about 500° C. or less and at a reactor pressure from about 100 mTorr to about 725 Torr effective to deposit {TAIL ~ a layer} comprising aluminum nitride over the substrate at such temperature and reactor pressure 
Ammonia and at least one of triethylaluminum and trimethylaluminum are fed to the reactor while the substrate is at { HEAD ~ a temperature } of about 500 ° C. or less and at a reactor pressure from about 100 mTorr to about 725 Torr effective to deposit { TAIL ~ a layer } comprising aluminum nitride over the substrate at such temperature and reactor pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH