Abstract

A buried conductive layer in GaAs was formed using a low-energy focused ion beam (FIB) and molecular beam epitaxy (MBE) combined system. The sheet carrier density of the structure was measured as a function of ion dose ranging from 2×1012 to 5×1013 cm−2 and postrapid thermal annealing time at 800 °C. It was shown that implanted Si ions at an ion energy of 200 eV and an ion dose of 2×1012 to 1×1013 cm−2 can be fully activated by choosing an optimum annealing condition. Present results suggest the possibility of fabricating a high quality two-dimensional electron gas (2DEG) layer in the laterally selected area in GaAs and GaAs/AlGaAs systems.

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