Bipolar semiconductor device with sub-cathode enhancement regions
First Claim
1. A bipolar semiconductor device comprising a plurality of unit cells, each of said plurality of unit cells comprising:
- a drift region having a first conductivity type situated over an anode layer having a second conductivity type opposite said first conductivity type;
first and second depletion trenches, each having a depletion electrode;
a first control trench situated between said first and second depletion trenches, said first control trench extending into said drift region and being adjacent to cathode diffusions;
an enhancement region having said first conductivity type localized in said drift region between said first control trench and at least one of said first and second depletion trenches,a third depletion trench adjacent to one of said first and second depletion trenches, wherein said enhancement region does not extend between said third depletion trench and either of said first and second depletion trenches,wherein said first control trench extends deeper into said drift region than said enhancement region.
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Abstract
There are disclosed herein various implementations of a bipolar semiconductor device with sub-cathode enhancement regions. Such a bipolar semiconductor device includes a drift region having a first conductivity type situated over an anode layer having a second conductivity type opposite the first conductivity type. The bipolar semiconductor device also includes first and second depletion trenches, each having a depletion electrode. In addition, the bipolar semiconductor device includes a first control trench situated between the first and second depletion trenches, the first control trench extending into the drift region and being adjacent to cathode diffusions. An enhancement region having the first conductivity type is localized in the drift region between the first control trench and one or both of the first and second depletion trenches. In one implementation, the bipolar semiconductor device may be an insulated-gate bipolar transistor (IGBT).
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Citations
18 Claims
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1. A bipolar semiconductor device comprising a plurality of unit cells, each of said plurality of unit cells comprising:
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a drift region having a first conductivity type situated over an anode layer having a second conductivity type opposite said first conductivity type; first and second depletion trenches, each having a depletion electrode; a first control trench situated between said first and second depletion trenches, said first control trench extending into said drift region and being adjacent to cathode diffusions; an enhancement region having said first conductivity type localized in said drift region between said first control trench and at least one of said first and second depletion trenches, a third depletion trench adjacent to one of said first and second depletion trenches, wherein said enhancement region does not extend between said third depletion trench and either of said first and second depletion trenches, wherein said first control trench extends deeper into said drift region than said enhancement region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An insulated-gate bipolar transistor (IGBT) comprising a plurality of IGBT unit cells, each of said plurality of IGBT unit cells comprising:
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a drift region having a first conductivity type situated over a collector having a second conductivity type opposite said first conductivity type; first and second depletion trenches, each having a depletion electrode; a first gate trench situated between said first and second depletion trenches, said first gate trench extending into said drift region and being adjacent to emitter diffusions; an enhancement region having said first conductivity type localized in said drift region between said first gate trench and at least one of said first and second depletion trenches, a third depletion trench adjacent to one of said first and second depletion trenches, wherein said enhancement region does not extend between said third depletion trench and either of said first and second depletion trenches, wherein said first gate trench extends deeper into said drift region than said enhancement region. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification