Electrode-aligned selective epitaxy method for vertical power devices
First Claim
1. A method of forming trench electrode structures, the method comprising:
- forming a first dielectric layer on a semiconductor substrate;
forming a second layer above the first dielectric layer;
forming an opening which extends through the second layer and the first dielectric layer to the semiconductor substrate such that part of the semiconductor substrate is uncovered;
forming an epitaxial layer on the uncovered part of the semiconductor substrate;
removing the second layer after forming the epitaxial layer; and
filling an open space formed by removing the second layer with an electrically conductive material, the electrically conductive material forming an electrode which is laterally surrounded by the epitaxial layer.
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Abstract
A method of forming trench electrode structures includes forming a first dielectric layer on a semiconductor substrate, forming a second layer above the first dielectric layer and forming an opening which extends through the second layer and the first dielectric layer to the semiconductor substrate such that part of the semiconductor substrate is uncovered. The method further comprises forming an epitaxial layer on the uncovered part of the semiconductor substrate, removing the second layer after forming the epitaxial layer and filling an open space formed by removing the second layer with an electrically conductive material. The electrically conductive material forms an electrode which is laterally surrounded by the epitaxial layer.
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Citations
20 Claims
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1. A method of forming trench electrode structures, the method comprising:
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forming a first dielectric layer on a semiconductor substrate; forming a second layer above the first dielectric layer; forming an opening which extends through the second layer and the first dielectric layer to the semiconductor substrate such that part of the semiconductor substrate is uncovered; forming an epitaxial layer on the uncovered part of the semiconductor substrate; removing the second layer after forming the epitaxial layer; and filling an open space formed by removing the second layer with an electrically conductive material, the electrically conductive material forming an electrode which is laterally surrounded by the epitaxial layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification