Lateral soi semiconductor device
First Claim
1. A lateral semiconductor-on-insulator device comprising:
- a semiconductor substrate′
an insulating layer on said semiconductor substrate; and
a lateral semiconductor device on said insulator;
said lateral semiconductor device having;
a first region of a first conductivity type;
a second region of a second conductivity type laterally spaced apart from said first region; and
a drift region extending in a lateral direction between said first region and said second region; and
wherein said drift region comprises at least one first zone and at least one second zone adjacent a said first zone, a said first zone having said second conductivity type, a said second zone being an insulating zone, a said first zone being tapered to narrow towards said first region.
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Abstract
This invention is generally concerned with semiconductor-on-insulator devices, particularly for high voltage applications. A lateral semiconductor-on-insulator device is described, comprising: a semiconductor substrate; an insulating layer on said semiconductor substrate; and a lateral semiconductor device on said insulator; said lateral semiconductor device having: a first region of a first conductivity type; a second region of a second conductivity type laterally spaced apart from said first region; and a drift region extending in a lateral direction between said first region and said second region; and wherein said drift region comprises at least one first zone and at least one second zone adjacent a said first zone, a said first zone having said second conductivity type, a said second zone being an insulating zone, a said first zone being tapered to narrow towards said first region.
18 Citations
29 Claims
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1. A lateral semiconductor-on-insulator device comprising:
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a semiconductor substrate′ an insulating layer on said semiconductor substrate; and
a lateral semiconductor device on said insulator;
said lateral semiconductor device having;
a first region of a first conductivity type;
a second region of a second conductivity type laterally spaced apart from said first region; and
a drift region extending in a lateral direction between said first region and said second region; and
wherein said drift region comprises at least one first zone and at least one second zone adjacent a said first zone, a said first zone having said second conductivity type, a said second zone being an insulating zone, a said first zone being tapered to narrow towards said first region. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13, 14, 15)
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5. A lateral semiconductor-on-insulator device comprising:
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a semiconductor substrate;
an insulating layer on said semiconductor substrate; and
a lateral semiconductor device on said insulator;
said lateral semiconductor device having;
a first region of a first conductivity type;
a second region of a second conductivity type laterally spaced apart from said first region; and
a drift region extending a lateral direction between said first and said second region; and
wherein said drift region comprises interdigitated first and second zones, said first zones having said second conductivity type, a said second zone being an insulating zone, and wherein a ration of a lateral area of said drift region occupied by a said first zone to a lateral area occupied by a said second zone is less towards said first region than towards said second region. - View Dependent Claims (6, 7, 8)
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- 16. A lateral semiconductor-on-insulator device comprising a semiconductor substrate bearing an insulated layer over which a lateral MOS device is formed, the later MOS device comprising first and second semiconductor regions of opposing conductivity types linked by a lateral drift semiconductor region, said drift region comprising a plurality of zones, undoped zones alternating with doped zones, said doped zones joining said first and second regions and having an overall area which reduces from one of said first and second regions to the other of said first and second regions, whereby said drift region has a varying charge in a lateral direction between said first and second regions.
- 22. A silicon-on-insulator lateral MOS device having a drift region comprising a plurality of doped zones, said doped zones being interleaved with insulating zones.
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25. A lateral semiconductor-on-insulator device comprising:
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a semiconductor substrate;
an insulating layer on said semiconductor substrate; and
a lateral semiconductor device on said insulator;
said lateral semiconductor device having;
a first region of a first conductivity type;
a second region of a second conductivity type laterally spaced apart from said first region; and
a drift region extending in a lateral direction between said first region and said second region; and
wherein said drift region comprises at least one doped zone having said second conductivity type, said doped zone having a dimension which reduces towards said first region. - View Dependent Claims (26, 27, 28, 29)
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Specification