Rapid themal annealing (RTA) of Si-implantation into GaAs is studied.The optimalcondition is annealing at temperatures ranging from 930℃ to 960℃ for 5s in dry N_2. Electron concentration of the Si, As dual-implantation GaAs is increased considerably. Themaximum concentration of 3×10~(19)cm~(-3) was obtained in specimens implanted with 80keV Siand 150 keV As. The implantation doses for Si and AS were 1×10~(15)cm~(-2)and 3×10~(15)cm~(-2), respectively.TEM reveals that the removal of lattice damage of Si, As d...