Bipolar transistor with lattice matched base layer
First Claim
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1. A method of fabricating a heterojunction bipolar transistor comprising:
- growing a base layer comprising gallium, indium, arsenic, and nitrogen over an n-doped GaAs collector from a gallium, indium, arsenic, and nitrogen source, wherein the base layer is p-doped with carbon from an external carbon source to thereby have a carbon-dopant concentration in a range of between about 1.5×
1019 cm−
3 to about 7.0×
1019 cm−
3; and
growing an n-doped emitter layer over the base layer.
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Abstract
A semiconductor material which has a high carbon dopant concentration and is composed of gallium, indium, arsenic and nitrogen is disclosed. The material is useful in forming the base layer of gallium arsenide based heterojunction bipolar transistors because it can be lattice matched to gallium arsenide by controlling the concentration of indium and nitrogen. The disclosed semiconductor materials have a low sheet resistivity because of the high carbon dopant concentration obtained.
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Citations
17 Claims
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1. A method of fabricating a heterojunction bipolar transistor comprising:
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growing a base layer comprising gallium, indium, arsenic, and nitrogen over an n-doped GaAs collector from a gallium, indium, arsenic, and nitrogen source, wherein the base layer is p-doped with carbon from an external carbon source to thereby have a carbon-dopant concentration in a range of between about 1.5×
1019 cm−
3 to about 7.0×
1019 cm−
3; andgrowing an n-doped emitter layer over the base layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification