POWER TRANSISTOR WITH METAL SOURCE AND METHOD OF MANUFACTURE
First Claim
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1. A metal source power transistor comprising:
- a semiconductor substrate forming a drain layer of a first conductivity type;
a drift layer of a similar first conductivity type arranged on said drain layer;
a body region of a second conductivity type arranged in said drift layer;
a source region arranged in said body region, wherein said source region is formed from a metal and forms a Schottky contact to said body region; and
a gate electrode arranged on said body region and said drift region.
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Abstract
A metal source power transistor device and method of manufacture is provided, wherein the metal source power transistor having a source which is comprised of metal and which forms a Schottky barrier with the body region and channel region of the transistor. The metal source power transistor is unconditionally immune from parasitic bipolar action and, therefore, the effects of snap-back and latch-up, without the need for a body contact. The ability to allow the body to float in the metal source power transistor reduces the process complexity and allows for more compact device layout.
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Citations
21 Claims
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1. A metal source power transistor comprising:
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a semiconductor substrate forming a drain layer of a first conductivity type; a drift layer of a similar first conductivity type arranged on said drain layer; a body region of a second conductivity type arranged in said drift layer; a source region arranged in said body region, wherein said source region is formed from a metal and forms a Schottky contact to said body region; and a gate electrode arranged on said body region and said drift region. - View Dependent Claims (2, 3)
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4. A metal source power transistor comprising:
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a semiconductor substrate forming a drain layer of a first conductivity type; a drift layer of the first conductivity type arranged on the drain layer; a body region of a second conductivity type arranged in the drift layer; a source region arranged in the body region, wherein the source region includes at least one metal that forms a Schottky contact to the body region; and a gate structure arranged on the body region. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A planar metal source power transistor comprising:
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a semiconductor substrate forming a drain layer, wherein the semiconductor substrate includes silicon and wherein the drain layer includes P+ silicon; a drift layer arranged on the drain layer, wherein the drift layer includes epitaxially grown P-type silicon; a body region arranged in the drift layer, wherein the body region includes N-type silicon; a source region arranged in the body region, wherein the source region includes at least one metal that forms a Schottky contact to the body region and wherein the at least one metal includes platinum silicide; a gate structure arranged on the body region and on the drain layer wherein the gate structure includes; a gate insulating layer that covers a common surface of both the drift layer and the body region, wherein the gate insulating layer includes silicon dioxide; a gate electrode that covers the gate insulating layer, wherein the gate electrode includes boron-doped polysilicon; and an insulating sidewall spacer that covers at least one side of the gate electrode, wherein the insulating sidewall spacer includes silicon dioxide; wherein the source region and the drift region are controllably electrically connected to one another by a channel region that is controlled by a voltage on the gate structure; and wherein the body region is not contacted by a body contact allowing the body region to electrically float. - View Dependent Claims (21)
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Specification