High doping of phosphorus in Si using gas source molecular beam epitaxy

Abstract
Phosphorus doping using PH3 in gas source Si molecular beam epitaxy was studied. High phosphorus doping up to 2×1020 cm3 was successfully achieved. The phosphorus concentration in the epitaxial layer was proportional to the PH3 flow rate. Moreover, selective growth of the phosphorus‐doped layer was possible. The pn diode, which consisted of a selectively grown phosphorus‐doped layer, a p‐Si (100) substrate, and a SiO2 sidewall, showed a normal IV characteristic.