Abstract
A wide range of carbon doping in molecular‐beam‐epitaxy‐grown GaAs and AlGaAs alloys was obtained by means of a new electron‐beam heated solid source. Free hole concentrations from low 1015 cm−3 to over 1×1020 cm−3 were reproducibly obtained in GaAs and in direct‐gap AlxGa1−xAs while maintaining good surface morphology. These results extend the doping range in both directions with respect to commercial solid carbon sources. High activation percentage, negligible memory effects and diffusion were demonstrated via secondary ion mass spectrometer and photoluminescence measurements.
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More From: Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures
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