Doping Characteristics of Gas-Source MBE-Grown n-AlxGa1-xAs (x=0-0.28) Doped Using Disilane

Abstract
Si doping using uncracked disilane (Si2H6) in gas-source molecular beam epitaxy of n-Al x Ga1-x As (x=0-0.28) using triethyl gallium, triethyl aluminum, and arsine was studied in a carrier concentration from 5 × 1017 to 2 × 1018 cm-3. We found that (1) the Si atomic concentration of AlGaAs is proportional to the Si2H6 flow rate, and decreases with increasing Al content at a constant Si2H6 flow rate, and (2) the carrier concentration of AlGaAs shows a square-root dependence on the Si atomic concentration incorporated.