Abstract
Epitaxial GaAs/NiAl/GaAs heterostructures consisting of buried NiAl layers and GaAs overlayers that are monocrystalline and well aligned have been fabricated by a combination of solid-phase reactions and molecular beam epitaxy. The structures have been characterized by reflection high-energy electron diffraction, electron microscopy, and ion channeling. The achievement of these stable and epitaxial buried-metal heterostructures makes possible the fabrication of metal-base and permeable-base transistors, buried interconnects, and buried ground planes.
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