Method of forming a transistor and structure therefor
First Claim
1. A transistor comprising:
- a semiconductor substrate of a first conductivity type, the semiconductor substrate having a first surface and a second surface;
a first semiconductor region having a second conductivity type on the first surface of the semiconductor substrate;
a second semiconductor region formed within the first semiconductor region wherein a portion of the first semiconductor region underlies the second semiconductor region, the second semiconductor region having the first conductivity type;
a gate structure formed in an opening that extends from the second semiconductor region into the first semiconductor region;
a gate conductor of the gate structure formed within the opening and overlying a first portion of the first semiconductor region;
a source region adjacent the gate conductor and spaced laterally from the gate conductor;
a gate insulator between the gate conductor and the first portion of the first semiconductor region and between the source region and the gate conductor wherein a channel region of the transistor is in the first portion of the first semiconductor region so that current flows laterally between the source region and under the gate structure;
a shield conductor overlying the gate conductor; and
a shield insulator between the gate conductor and the shield conductor.
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Accused Products
Abstract
In one embodiment, a semiconductor device is formed to include a gate structure extending into a semiconductor material that is underlying a first region of semiconductor material. The gate structure includes a conductor and also a gate insulator that has a first portion positioned between the gate conductor and a first portion of the semiconductor material that underlies the gate conductor. The first portion of the semiconductor material is configured to form a channel region of the transistor which underlies the gate conductor. The gate structure may also include a shield conductor overlying the gate conductor and having a shield insulator between the shield conductor and the gate conductor. The shield insulator may also have a second portion positioned between the shield conductor and a second portion of the gate insulator and a third portion overlying the shield conductor.
8 Citations
19 Claims
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1. A transistor comprising:
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a semiconductor substrate of a first conductivity type, the semiconductor substrate having a first surface and a second surface; a first semiconductor region having a second conductivity type on the first surface of the semiconductor substrate; a second semiconductor region formed within the first semiconductor region wherein a portion of the first semiconductor region underlies the second semiconductor region, the second semiconductor region having the first conductivity type; a gate structure formed in an opening that extends from the second semiconductor region into the first semiconductor region; a gate conductor of the gate structure formed within the opening and overlying a first portion of the first semiconductor region; a source region adjacent the gate conductor and spaced laterally from the gate conductor; a gate insulator between the gate conductor and the first portion of the first semiconductor region and between the source region and the gate conductor wherein a channel region of the transistor is in the first portion of the first semiconductor region so that current flows laterally between the source region and under the gate structure; a shield conductor overlying the gate conductor; and a shield insulator between the gate conductor and the shield conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device comprising:
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a semiconductor material of a first conductivity type having a first surface and a second surface; a first doped region within the semiconductor material and having a second conductivity type; a gate structure extending into the semiconductor material that is underlying the first doped region; a gate conductor of the gate structure; a gate insulator of the gate structure extending through the first doped region into the semiconductor material and having a first portion of the gate insulator positioned between the gate conductor and a first portion of the semiconductor material that is external to the first doped region and that underlies the gate conductor wherein the first portion of the semiconductor material is a channel region of the semiconductor device wherein the channel region is configured so that current flows laterally under the gate structure; a shield conductor of the gate structure overlying the gate conductor; and a shield insulator having a first portion overlying the shield conductor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A semiconductor device comprising:
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a semiconductor material of a first conductivity type having a first surface and a second surface; a first doped region of within the semiconductor material and having a second conductivity type; a gate structure extending into the semiconductor material that is underlying the first region; a gate conductor of the gate structure; a gate insulator of the gate structure having a first portion of the gate insulator positioned between the gate conductor and a first portion of the semiconductor material that is external to the first doped region and that underlies the gate conductor wherein the first portion of the semiconductor material is a channel region of the semiconductor device; a shield conductor of the gate structure overlying the gate conductor; and a shield insulator having a first portion overlying the shield conductor and electrically insulating the shield conductor from the gate conductor.
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Specification