HETEROJUNCTION BIPOLAR TRANSISTORS WITH AN INVERTED CRYSTALLINE BOUNDARY IN THE BASE LAYER
First Claim
1. A structure for a heterojunction bipolar transistor, the structure comprising:
- a trench isolation region surrounding an active region of semiconductor material;
a collector in the active region;
a base layer including a first section over the trench isolation region, a second section over the active region, and a third section over the active region that connects the first section and the second section;
an emitter arranged over the second section of the base layer; and
an extrinsic base layer arranged over the first section of the base layer and the third section of the base layer, the extrinsic base layer including a first section containing polycrystalline semiconductor material and a second section containing single-crystal semiconductor material, and the first section of the extrinsic base layer intersecting the second section of the extrinsic base layer along an interface that extends over the trench isolation region.
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Accused Products
Abstract
Fabrication methods and device structures for a heterojunction bipolar transistor. A trench isolation region is formed that surrounds an active region of semiconductor material, a collector is formed in the active region, and a base layer is deposited that includes a first section over the trench isolation region, a second section over the active region, and a third section over the active region that connects the first section and the second section. An emitter is arranged over the second section of the base layer, and an extrinsic base layer is arranged over the first section of the base layer and the third section of the base layer. The extrinsic base layer includes a first section containing polycrystalline semiconductor material and a second section containing single-crystal semiconductor material. The first and second sections of the extrinsic base layer intersect along an interface that extends over the trench isolation region.
5 Citations
20 Claims
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1. A structure for a heterojunction bipolar transistor, the structure comprising:
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a trench isolation region surrounding an active region of semiconductor material; a collector in the active region; a base layer including a first section over the trench isolation region, a second section over the active region, and a third section over the active region that connects the first section and the second section; an emitter arranged over the second section of the base layer; and an extrinsic base layer arranged over the first section of the base layer and the third section of the base layer, the extrinsic base layer including a first section containing polycrystalline semiconductor material and a second section containing single-crystal semiconductor material, and the first section of the extrinsic base layer intersecting the second section of the extrinsic base layer along an interface that extends over the trench isolation region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for fabricating a heterojunction bipolar transistor, the method comprising:
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forming a trench isolation region surrounding an active region of semiconductor material that includes a collector; epitaxially growing a base layer that includes a first section over the trench isolation region, a second section over the active region, and a third section over the active region that connects the first section and the second section; forming an emitter arranged over the second section of the base layer; and epitaxially growing an extrinsic base layer arranged over the first section of the base layer and the third section of the base layer, wherein the extrinsic base layer includes a first section containing polycrystalline semiconductor material and a second section containing single-crystal semiconductor material, and the first section of the extrinsic base layer intersects the second section of the extrinsic base layer along an interface that extends over the trench isolation region. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification