Power metal-oxide-semiconductor field effect transistor
First Claim
Patent Images
1. A metal-oxide-semiconductor field effect transistor in a grooved or trench configuration and comprising the following regions in succession:
- a source region of a first conductivity type;
a body region of a second conductivity type; and
a drain region of said first conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said body region into said drain region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and
a shield region bounded by said drain region and said insulating layer and adjacent to said corner, said shield region being of said first conductivity type and being doped to a lesser degree than said drain region, said shield region operating to inhibit voltage breakdown at or near said corner.
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Abstract
A metal-oxide-semiconductor field effect transistor constructed in a trench or groove configuration is provided with protection against voltage breakdown by the formation of a shield region adjacent to the insulating layer which borders the gate of the transistor. The shield region is either more lightly doped than, or has a conductivity opposite to, that of the region in which it is formed, normally the drift or drain region, and it is formed adjacent to a corner on the boundary between the insulating layer and the drift or drain region, where voltage breakdown is most likely to occur.
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Citations
39 Claims
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1. A metal-oxide-semiconductor field effect transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a body region of a second conductivity type; and a drain region of said first conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said body region into said drain region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said drain region and said insulating layer and adjacent to said corner, said shield region being of said first conductivity type and being doped to a lesser degree than said drain region, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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3. A metal-oxide-semiconductor field effect transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a body region of a second conductivity type; and a drain region of said first conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said body region into said drain region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said drain region and said insulating layer and adjacent to said corner, said shield region being of said second conductivity type, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (4)
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14. A metal-oxide-semiconductor field effect transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a body region of a second conductivity type; a drift region of said first conductivity type; and a drain region of said first conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said body region into said drift region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said drift region and said insulating layer and adjacent to said corner, said shield region being of said first conductivity type and being doped to a lesser degree than said drift region, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (15, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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16. A metal-oxide-semiconductor field effect transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a body region of a second conductivity type; a drift region of said first conductivity type; and a drain region of said first conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said body region into said drift region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said drift region and said insulating layer and adjacent to said corner, said shield region being of said second conductivity type, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (17)
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27. An insulated gate bipolar transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a collector/body region of a second conductivity type; a base/drift region of said first conductivity type; a drain region; and an emitter of said second conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said collector/body region into said base/drift region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said base/drift region and said insulating layer and adjacent to said corner, said shield region being of said first conductivity type and being doped to a lesser degree than said base/drift region, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (28, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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29. An insulated gate bipolar transistor in a grooved or trench configuration and comprising the following regions in succession:
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a source region of a first conductivity type; a collector/body region of a second conductivity type; a base/drift region of said first conductivity type; a drain region; and an emitter of said second conductivity type; and
additionally comprisinga gate formed in a trench or groove, said trench or groove extending through said collector/body region into said base/drift region, said gate bordered by an insulating layer, said insulating layer having a boundary, and said boundary including a corner; and a shield region bounded by said base/drift region and said insulating layer and adjacent to said corner, said shield region being of said second conductivity type, said shield region operating to inhibit voltage breakdown at or near said corner. - View Dependent Claims (30)
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Specification