We report the results of GaAs grown by vacuum atomic layer epitaxy usi
ng trimethylgallium (TMGa) and tertiarybutylarsine (TBAs) as the group
III and V sources. The growth rate saturates at one monolayer per cyc
le for a wide range of growth parameters. The temperature window for m
onolayer growth is as wide as 70 degrees C. All the films are p-type w
ith the carrier concentration depending on the exposure conditions of
TMGa and TBAs.