Semiconductor fin on local oxide
First Claim
1. A semiconductor structure comprising:
- a single crystalline semiconductor material portion;
a semiconductor oxide portion located on said single crystalline semiconductor material portion and including a first semiconductor oxide portion comprising an oxide of a first semiconductor material and a second semiconductor oxide portion contacting a top surface of said first semiconductor oxide portion and comprising an oxide of a second semiconductor material that is different from said first semiconductor material; and
a semiconductor fin comprising said second semiconductor material,wherein said second semiconductor oxide portion underlies at least a portion of said semiconductor fin such that a bottom surface of said semiconductor fin contacts a top surface of said second semiconductor oxide portion, andwherein an entirety of a bottom surface of said second semiconductor oxide portion contacts said top surface of said first semiconductor oxide portion.
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Accused Products
Abstract
A semiconductor substrate including a first epitaxial semiconductor layer is provided. The first epitaxial semiconductor layer includes a first semiconductor material, and can be formed on an underlying epitaxial substrate layer, or can be the entirety of the semiconductor substrate. A second epitaxial semiconductor layer including a second semiconductor material is epitaxially formed upon the first epitaxial semiconductor layer. Semiconductor fins including portions of the second single crystalline semiconductor material are formed by patterning the second epitaxial semiconductor layer employing the first epitaxial semiconductor layer as an etch stop layer. At least an upper portion of the first epitaxial semiconductor layer is oxidized to provide a localized oxide layer that electrically isolates the semiconductor fins. The first semiconductor material can be selected from materials more easily oxidized relative to the second semiconductor material to provide a uniform height for the semiconductor fins after formation of the localized oxide layer.
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Citations
19 Claims
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1. A semiconductor structure comprising:
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a single crystalline semiconductor material portion; a semiconductor oxide portion located on said single crystalline semiconductor material portion and including a first semiconductor oxide portion comprising an oxide of a first semiconductor material and a second semiconductor oxide portion contacting a top surface of said first semiconductor oxide portion and comprising an oxide of a second semiconductor material that is different from said first semiconductor material; and a semiconductor fin comprising said second semiconductor material, wherein said second semiconductor oxide portion underlies at least a portion of said semiconductor fin such that a bottom surface of said semiconductor fin contacts a top surface of said second semiconductor oxide portion, and wherein an entirety of a bottom surface of said second semiconductor oxide portion contacts said top surface of said first semiconductor oxide portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification