METHOD OF FORMING A BOTTLE-SHAPED TRENCH BY ION IMPLANTATION
First Claim
1. A method of forming a bottle shaped trench in a substrate, comprising:
- forming at least one trench having an upper portion and a lower portion into a semiconductor substrate, said at least one trench having bare vertical sidewalls that extend to a common bottom wall;
implanting ions into said semiconductor substrate abutting the upper portion of said at least one trench to form an amorphous region in the semiconductor substrate abutting said upper portion of said at least one trench; and
etching said lower portion of said at least one trench selective to the amorphous region to provide an elongated bottom portion which extends laterally beyond said upper portion, wherein the semiconductor substrate abutting the lower portion of the trench remains a single crystal material.
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Accused Products
Abstract
Disclosed is a method of forming a bottle shaped trench in a substrate which includes forming at least one trench having an upper portion and a lower portion into a semiconductor substrate, the at least one trench having vertical sidewalls that extend to a common bottom wall; implanting ions into the semiconductor substrate abutting the upper portion of the at least one trench to form an amorphous region in the semiconductor substrate abutting the upper portion of the at least one trench; and etching the lower portion of the at least one trench selective to the amorphous region to provide an elongated bottom portion which extends laterally beyond the upper portion.
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Citations
20 Claims
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1. A method of forming a bottle shaped trench in a substrate, comprising:
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forming at least one trench having an upper portion and a lower portion into a semiconductor substrate, said at least one trench having bare vertical sidewalls that extend to a common bottom wall; implanting ions into said semiconductor substrate abutting the upper portion of said at least one trench to form an amorphous region in the semiconductor substrate abutting said upper portion of said at least one trench; and etching said lower portion of said at least one trench selective to the amorphous region to provide an elongated bottom portion which extends laterally beyond said upper portion, wherein the semiconductor substrate abutting the lower portion of the trench remains a single crystal material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of forming a bottle shaped trench in a substrate, comprising:
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implanting ions into said semiconductor substrate to render an upper surface thereof amorphous; forming at least one trench having an upper amorphous region and a lower portion into a semiconductor substrate, said at least one trench having bare vertical sidewalls that extend to a common bottom wall; and etching said lower portion of said at least one trench selective to the amorphous region to provide an elongated bottom portion which extends laterally beyond said upper portion, wherein the semiconductor substrate abutting the lower portion of the trench remains a single crystal material.
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13. A method of forming a bottle shaped trench in a substrate, said method consisting essentially of:
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forming at least one trench having an upper portion and a lower portion into a semiconductor substrate, said at least one trench having bare vertical sidewalls that extend to a common bottom wall; implanting ions into said semiconductor substrate abutting the upper portion of said at least one trench to form an amorphous region in the semiconductor substrate abutting said upper portion of said at least one trench; and etching said lower portion of said at least one trench selective to the amorphous region to provide an elongated bottom portion which extends laterally beyond said upper portion, wherein the semiconductor substrate abutting the lower portion of the trench remains a single crystal material. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification