The electrical resistivity was investigated from room temperature down to 1.7 K for the shallow acceptor carbon in GaAs prepared by ion implantation with impurity concentrations between 1017 and 1019 cm-³. Good agreement was obtained between the measured resistivities and resistivities calculated by a generalized Drude approach at similar temperatures and doping concentrations. The critical impurity concentration for the metal–nonmetal transition was found to be about 1018 cm-³.
Journal of applied physics. Vol. 95, no. 5 (Mar. 2004), p. 2532-2535