Patent ID: 6399971
Filing Date: 2002-06-04
Classification: H01L

Abstract:
A semiconductor device comprising:a collector layer; a base layer of a carbon-doped GaxIn1âˆ’xAsySb1âˆ’y layer having one surface connected to the collector layer, a Ga composition x of the GaxIn1âˆ’xAsySb1âˆ’y layer being more than 0, an As composition y of the GaxIn1âˆ’xAsySb1âˆ’y layer being more than 0, the Ga composition x of the GaxIn1âˆ’xAsySb1âˆ’y layer being not 1 when the As composition y of the GaxIn1âˆ’xAsySb1âˆ’y layer is 1; an emitter layer connected to the other surface of the base layer; a base contact layer of a carbon-doped GaAsSb layer electrically connected to the base layer, the base layer being lattice-matched with the base layer; and a base electrode formed on the base contact layer.