Bipolar semiconductor device with multi-trench 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;
a first control trench extending through an inversion region having said second conductivity type, and further extending into said drift region, said first control trench adjacent to cathode diffusions;
first and second depletion trenches, each having a depletion electrode;
said first depletion trench being situated between said second depletion trench and said first control trench;
an enhancement region having said first conductivity type localized in said drift region and extending from said first control trench to said first depletion trench and further from said first depletion trench to said second depletion trench; and
a second control trench adjacent to said first control trench, said enhancement region not extending between said first control trench and said second control trench.
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Accused Products
Abstract
There are disclosed herein various implementations of a bipolar semiconductor device with multi-trench enhancement regions. Such a bipolar semiconductor device includes a drift region having a first conductivity type situated over an anode layer having an opposite, second conductivity type. The device also includes a first control trench extending through an inversion region having the second conductivity type, and further extending into the drift region, the first control trench being adjacent to cathode diffusions. In addition, the device includes first and second depletion trenches, each having a depletion electrode, the first depletion trench being situated between the second depletion trench and the first control trench. An enhancement region having the first conductivity type is localized in the drift region and extends from the first control trench to the first second depletion trench and further from the first depletion trench to the second depletion trench.
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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; a first control trench extending through an inversion region having said second conductivity type, and further extending into said drift region, said first control trench adjacent to cathode diffusions; first and second depletion trenches, each having a depletion electrode; said first depletion trench being situated between said second depletion trench and said first control trench; an enhancement region having said first conductivity type localized in said drift region and extending from said first control trench to said first depletion trench and further from said first depletion trench to said second depletion trench; and a second control trench adjacent to said first control trench, said enhancement region not extending between said first control trench and said second control trench. - 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; a first gate trench extending through an inversion region having said second conductivity type, and further extending into said drift region, said first gate trench adjacent to emitter diffusions; first and second depletion trenches, each having a depletion electrode; said first depletion trench being situated between said second depletion trench and said first gate trench; an enhancement region having said first conductivity type localized in said drift region and extending from said first gate trench to said first depletion trench and further from said first depletion trench to said second depletion trench; and a second gate trench adjacent to said first gate trench, said enhancement region not extending between said first gate trench and said second gate trench. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification