Abstract
The fabrication of a GaAs/AlGaAs heterojunction bipolar transistor (HBT) having a carbon-doped base is reported. The low diffusion coefficient of carbon makes it attractive for HBT applications since it will prevent out diffusion. The base was grown by atomic layer epitaxy (ALE), from a TMG (trimethylgallium) source that allowed the incorporation of carbon into the layer from the partially related TMG metal carbide. HBTs with common-emitter current gains of 100 were obtained at current densities of 1300 A-cm/sup -2/.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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