Power semiconductor device with source trench and termination trench implants
First Claim
1. A power semiconductor device comprising:
- a source region in a body region;
a gate trench adjacent to said source region;
a source trench electrically coupled to said source region, said source trench having a source trench conductive filler surrounded by a source trench dielectric liner, said source trench extending into a drift region;
a source trench implant below said source trench, said source trench implant having a conductivity type opposite that of said drift region;
said source trench being electrically insulated from said source trench implant by said source trench dielectric liner;
a drain region below said drift region.
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Accused Products
Abstract
A power semiconductor device is disclosed. The power semiconductor device includes a source region in a body region, a gate trench adjacent to the source region, and a source trench electrically coupled to the source region. The source trench includes a source trench conductive filler surrounded by a source trench dielectric liner, and extends into a drift region. The power semiconductor device includes a source trench implant below the source trench and a drain region below the drift region, where the source trench implant has a conductivity type opposite that of the drift region. The power semiconductor device may also include a termination trench adjacent to the source trench, where the termination trench includes a termination trench conductive filler surrounded by a termination trench dielectric liner. The power semiconductor device may also include a termination trench implant below the termination trench.
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Citations
20 Claims
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1. A power semiconductor device comprising:
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a source region in a body region; a gate trench adjacent to said source region; a source trench electrically coupled to said source region, said source trench having a source trench conductive filler surrounded by a source trench dielectric liner, said source trench extending into a drift region; a source trench implant below said source trench, said source trench implant having a conductivity type opposite that of said drift region; said source trench being electrically insulated from said source trench implant by said source trench dielectric liner; a drain region below said drift region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power semiconductor device comprising:
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a source region in a body region; a gate trench adjacent to said source region; a source trench electrically coupled to said source region; a termination trench in said drift region adjacent to said source trench, said termination trench having a termination trench conductive filler surrounded by a termination trench dielectric liner; a termination trench implant below said termination trench, said termination trench implant having a conductivity type opposite that of said drift region; said termination trench being electrically insulated from said termination trench implant by said termination trench dielectric liner; a drain region below said drift region. - View Dependent Claims (9, 10, 11, 12)
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13. A method of forming a power semiconductor device, said method comprising:
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forming a drift region of a first conductivity type; forming a trench in said drift region; forming a trench implant of a second conductivity type below said trench; forming a dielectric liner on a bottom and sidewalls of the trench; depositing, after forming said trench implant of said second conductivity type below said trench, a conductive filler surrounded by said dielectric liner. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification