Method and apparatus for forming a capacitive structure including single crystal silicon
First Claim
1. A method, comprising:
- etching one or more trenches in an optical waveguide disposed in a substrate including a first semiconductor material;
growing an insulating layer on an inside surface of the one or more trenches to form a plurality of interfaces between the insulating layer and the first semiconductor material in each of the one or more trenches;
etching an additional one or more longitudinal trenches adjacent to the one or more trenches to remove a first one of the plurality of interfaces to create at least one lateral opening in each of the one or more trenches; and
laterally growing single crystal silicon through the at least one opening to form single crystal silicon in the one or more trenches.
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Abstract
A capacitive structure including single crystal silicon and an insulating layer in a semiconductor substrate. One embodiment of the present invention includes an optical switching device having one or more capacitive structures including single crystal silicon in a substrate such as a silicon-on-insulator (SOI) wafer and can be used in a variety of high bandwidth applications including multi-processor, telecommunications, networking or the like. In one embodiment, a capacitive structure includes single crystal silicon disposed in a first semiconductor material with an insulating layer disposed between the single crystal silicon and the semiconductor material. In one embodiment, a capacitive structure may be formed by laterally growing single crystal silicon through an opening in a trench adjacent to a trench where the capacitive structures is formed.
39 Citations
14 Claims
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1. A method, comprising:
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etching one or more trenches in an optical waveguide disposed in a substrate including a first semiconductor material;
growing an insulating layer on an inside surface of the one or more trenches to form a plurality of interfaces between the insulating layer and the first semiconductor material in each of the one or more trenches;
etching an additional one or more longitudinal trenches adjacent to the one or more trenches to remove a first one of the plurality of interfaces to create at least one lateral opening in each of the one or more trenches; and
laterally growing single crystal silicon through the at least one opening to form single crystal silicon in the one or more trenches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification