Method for manufacturing a semiconductor component that includes a field plate
First Claim
1. A method for manufacturing a semiconductor component, comprising:
- providing a first semiconductor material having first and second opposing surfaces;
forming at least one trench in the first semiconductor material, the at least one trench having at least one sidewall and first and second trench regions, the second trench region between the first surface and the first trench region;
forming a dielectric material in the at least one trench, the dielectric material extending from the second trench region to the first trench region;
forming a second semiconductor material in the first trench region of the at least one trench, the dielectric material between the second semiconductor material and the at least one sidewall of the at least one trench, the second semiconductor material serving as a first portion of a field plate;
removing a portion of the dielectric material from the second trench region of the at least one trench to expose a portion of the at least one sidewall;
forming a gate structure within the second trench region of the at least one trench and adjacent to the exposed portion of the at least one sidewall; and
forming a third semiconductor material within the second trench region of the at least one trench, the third semiconductor material electrically separated from the gate structure and electrically coupled to the second semiconductor material, the third semiconductor material serving as a second portion of the field plate.
7 Assignments
0 Petitions
Accused Products
Abstract
A semiconductor component that includes a field plate and a semiconductor device and a method of manufacturing the semiconductor component. A semiconductor material includes an epitaxial layer disposed on a semiconductor substrate. A trench having an upper portion and a lower portion is formed in the epitaxial layer. A portion of a field plate is formed in the lower portion of the trench, wherein the field plate is electrically isolated from trench sidewalls. A gate structure is formed in the upper portion of the trench, wherein a gate oxide is formed from opposing sidewalls of the trench. Gate electrodes are formed adjacent to the gate oxide formed from the opposing sidewalls and a dielectric material is formed adjacent to the gate electrode. Another portion of the field plate is formed in the upper portion of the trench and cooperates with the portion of the field plate formed in the lower portion of the trench to form the field plate.
12 Citations
20 Claims
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1. A method for manufacturing a semiconductor component, comprising:
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providing a first semiconductor material having first and second opposing surfaces; forming at least one trench in the first semiconductor material, the at least one trench having at least one sidewall and first and second trench regions, the second trench region between the first surface and the first trench region; forming a dielectric material in the at least one trench, the dielectric material extending from the second trench region to the first trench region; forming a second semiconductor material in the first trench region of the at least one trench, the dielectric material between the second semiconductor material and the at least one sidewall of the at least one trench, the second semiconductor material serving as a first portion of a field plate; removing a portion of the dielectric material from the second trench region of the at least one trench to expose a portion of the at least one sidewall; forming a gate structure within the second trench region of the at least one trench and adjacent to the exposed portion of the at least one sidewall; and forming a third semiconductor material within the second trench region of the at least one trench, the third semiconductor material electrically separated from the gate structure and electrically coupled to the second semiconductor material, the third semiconductor material serving as a second portion of the field plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for manufacturing a semiconductor component, comprising:
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providing a first semiconductor material having first and second opposing surfaces; forming at least one trench in the first semiconductor material, the at least one trench having first and second sidewalls; forming a dielectric material in the at least one trench, a first portion of the dielectric material adjacent the first sidewall and a second portion of the dielectric material adjacent the second sidewall; forming a second semiconductor material in the at least one trench, the dielectric material between the second semiconductor material and the at least one sidewall of the at least one trench and between first and second portions of the dielectric material; removing a portion of the second semiconductor material between the first and second portions of the dielectric material to form a first electrically conductive structure; forming a first portion of a gate structure within the at least one trench by; removing subportions of the dielectric material; forming dielectric material from portions of the first and second sidewalls of the at least one trench by oxidizing portions of the first semiconductor material exposed by the at least one trench; and forming a gate electrode adjacent the dielectric material formed from the first and second sidewalls of the at least one trench by depositing an electrically conductive material adjacent the dielectric material formed from the portions of the first and second sidewalls of the at least one trench; forming a third semiconductor material within the at least one trench, the third semiconductor material electrically separated from the gate structure; and forming a layer of dielectric material over the electrically conductive material and removing portions of the layer of dielectric material to form first and second dielectric barriers that are laterally spaced apart from the first and second sidewalls of the at least one trench, wherein the first and second dielectric barriers have first and second sides; removing a portion of the electrically conductive material between the first side of the first dielectric barrier and the first sidewall; and removing a portion of the electrically conductive material between the first side of the second dielectric barrier and the second sidewall. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for manufacturing a semiconductor component, comprising:
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providing a semiconductor substrate of a first conductivity type; forming an epitaxial layer of the first conductivity type and a first resistivity over the semiconductor substrate, the epitaxial layer having a major surface; forming a trench in the epitaxial layer, the trench having first and second sidewalls and a second trench region over a first trench region, wherein the first and second sidewalls extend into the first and second trench regions; forming a first layer of dielectric material in the first and second trench regions; forming a first portion of a field plate in the first trench region; removing portions of the first layer of dielectric material to expose portions of the first and second sidewalls in the second trench region and portions of the epitaxial layer adjacent to the second trench region, wherein the portions of the first layer of dielectric material on the first and second sidewalls in the first trench region remain; forming a gate dielectric adjacent the exposed portion of the first sidewall of the second trench region and from a the exposed portion of the epitaxial layer; forming a gate electrode in the second trench region, the gate electrode adjacent the gate dielectric; forming a dielectric material adjacent the gate electrode; and forming a conductive plug in the second trench region, the conductive plug serving as a second portion of the field plate, electrically coupled to the first portion of the field plate, and electrically isolated from the gate electrode. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification