Mg diffusion during metalorganic vapor phase epitaxy of InP

Abstract
The diffusion mechanism of Mg has been studied during low-pressure metalorganic vapor phase epitaxy of InP. The Mg dopant profiles were measured by secondary-ion mass spectroscopy. The analysis reveals that abrupt Mg dopant profiles are possible; the Mg diffusion, however, strongly depends on the Mg concentration in the crystal lattice. Simultaneous doping with Si leads to a distinct decrease of the Mg diffusion. This behavior is consistent with a model assuming that Mg diffuses as a complex involving a deep donor.