Insulated gate semiconductor device having a shield electrode structure and method
First Claim
1. A method for forming an insulated gate semiconductor device comprising:
- providing a semiconductor region comprising;
a semiconductor substrate;
a first semiconductor layer of a first conductivity type and a first dopant concentration on the semiconductor substrate, anda second semiconductor layer on the first semiconductor layer, the second semiconductor layer having the first conductivity type, having a second dopant concentration greater than the first dopant concentration;
forming a trench structure disposed in the first semiconductor layer and the second semiconductor layer extending from the major surface, wherein the trench structure comprises;
a trench;
an insulated gate electrode; and
an insulated shield electrode adjacent the insulated gate electrode;
forming a body region of a second conductivity type in the second semiconductor layer extending from the major surface, wherein the trench structure is adjacent the body region;
forming a source region of the first conductivity type in the body region adjacent the trench structure; and
forming a doped region of the second conductivity type in the second semiconductor layer adjacent a lower surface of the body region, wherein a portion of the second semiconductor layer separates the doped region from the trench structure and another portion of the second semiconductor layer separates the doped region from the first semiconductor layer.
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Accused Products
Abstract
A semiconductor device includes a semiconductor region with a charge balance region on a junction blocking region, which has a lower doping concentration. A trench structure having an insulated shield electrode and an insulated gate electrode is provided in the semiconductor region. The semiconductor device further includes one or more features configured to improve operating performance. The features include terminating the trench structure in the junction blocking region, providing a localized doped region adjoining a lower surface of a body region and spaced apart from the trench structure, disposing a notch proximate to the lower surface of the body region, and/or configuring the insulated shield electrode to have a wide portion adjoining a narrow portion.
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Citations
20 Claims
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1. A method for forming an insulated gate semiconductor device comprising:
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providing a semiconductor region comprising; a semiconductor substrate; a first semiconductor layer of a first conductivity type and a first dopant concentration on the semiconductor substrate, and a second semiconductor layer on the first semiconductor layer, the second semiconductor layer having the first conductivity type, having a second dopant concentration greater than the first dopant concentration; forming a trench structure disposed in the first semiconductor layer and the second semiconductor layer extending from the major surface, wherein the trench structure comprises; a trench; an insulated gate electrode; and an insulated shield electrode adjacent the insulated gate electrode; forming a body region of a second conductivity type in the second semiconductor layer extending from the major surface, wherein the trench structure is adjacent the body region; forming a source region of the first conductivity type in the body region adjacent the trench structure; and forming a doped region of the second conductivity type in the second semiconductor layer adjacent a lower surface of the body region, wherein a portion of the second semiconductor layer separates the doped region from the trench structure and another portion of the second semiconductor layer separates the doped region from the first semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for forming an insulated gate semiconductor device comprising:
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providing a region of semiconductor material comprising; a semiconductor substrate; a first semiconductor layer of a first conductivity type and a first dopant concentration on the semiconductor substrate; and a second semiconductor layer on the first semiconductor layer, the second semiconductor layer having the first conductivity type, having a second dopant concentration greater than the first dopant concentration, and having a major surface; forming a first trench structure in the first semiconductor layer and the second semiconductor layer extending from the major surface, and wherein the first trench structure comprises; a first trench terminating within the first semiconductor layer; a first insulated gate electrode; and a first insulated shield electrode below the first insulated gate electrode; forming a second trench structure in the first semiconductor layer and the second semiconductor layer extending from the major surface, wherein the second trench structure and the first trench structure are laterally spaced apart, and wherein the second trench structure comprises; a second trench terminating within the first semiconductor layer; a second insulated gate electrode; and a second insulated shield electrode below the second insulated gate electrode, wherein the second semiconductor layer is a continuous layer extending between the first trench and the second trench; forming a body region of a second conductivity type in the second semiconductor layer extending from the major surface, wherein the body region is adjacent the first trench structure and adjacent the second trench structure; forming a first source region of the first conductivity type in the body region adjacent the first trench structure; and forming a second source region of the first conductivity type in the body region adjacent the second trench structure. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for forming an insulated gate semiconductor device comprising:
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providing a region of semiconductor material comprising a semiconductor substrate, a first semiconductor layer of a first conductivity type and a first dopant concentration adjacent the semiconductor substrate, and a second semiconductor layer adjacent the first semiconductor layer, the second semiconductor layer having the first conductivity type, having a second dopant concentration greater than the first dopant concentration, and having a major surface; forming a trench structure having a trench structure first portion and a trench structure second portion in cross-sectional view, wherein the second semiconductor layer is a continuous layer extending between the trench structure first portion and the trench structure second portion in cross-sectional view, and wherein the trench structure comprises; a trench extending from the major surface terminating within the first semiconductor layer; an insulated gate electrode; and an insulated shield electrode below the insulated gate electrode; forming a body region of a second conductivity type in the second semiconductor layer extending from the major surface, wherein the body region is adjacent to the trench structure first portion and adjacent to the trench structure second portion; and forming a source region of the first conductivity type in the body region, wherein the source region comprises a source region first portion adjacent the trench structure first portion and a source region second portion adjacent the trench structure second portion in cross-sectional view. - View Dependent Claims (17, 18, 19, 20)
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Specification