Abstract
GaAs selective epitaxial growth by molecular‐beam epitaxy (MBE) was studied as a function of substrate temperature. Selectivity was observed at as low as 600 °C with 1×105 Torr As pressure and a 0.04 μm/h growth rate. The heterogeneous nucleation theory gives a good explanation for the selectivity dependence on substrate temperature. Selective epitaxial growth by MBE is promising for device applications which require thin localized epilayers.