Superjunction structures for power devices
First Claim
1. A power device, comprising:
- an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type, the plurality of pillars of the second conductivity type in the active region each having substantially the same width;
a termination region surrounding at least a portion of the active region and having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, the plurality of pillars of the second conductivity type in the active region each having substantially the same width and being smaller than each width of the pillars of the second conductivity type in the termination region; and
a transition region disposed between the active region and the termination region, the transition region having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, the plurality of pillars of the second conductivity type in the transition region each having a width greater than each width of the pillars of the second conductivity type in the termination region, the plurality of pillars of the second conductivity type in the termination region each having substantially the same width.
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Accused Products
Abstract
In one general aspect, a power device includes an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type where the plurality of pillars of the second conductivity type in the active region each have substantially the same width. The power device includes a termination region surrounding at least a portion of the active region and having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type where the plurality of pillars of the second conductivity type in the active region each have substantially the same width and are smaller than each width of the pillars of the second conductivity type in the termination region. The power device includes a transition region disposed between the active region and the termination region.
432 Citations
25 Claims
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1. A power device, comprising:
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an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type, the plurality of pillars of the second conductivity type in the active region each having substantially the same width; a termination region surrounding at least a portion of the active region and having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, the plurality of pillars of the second conductivity type in the active region each having substantially the same width and being smaller than each width of the pillars of the second conductivity type in the termination region; and a transition region disposed between the active region and the termination region, the transition region having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, the plurality of pillars of the second conductivity type in the transition region each having a width greater than each width of the pillars of the second conductivity type in the termination region, the plurality of pillars of the second conductivity type in the termination region each having substantially the same width. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power device, comprising:
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an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type, the plurality of pillars of the first conductivity type in the active region each having substantially the same width; a termination region surrounding at least a portion of the active region and having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, each of the plurality of pillars of the second conductivity type in the termination region having the same width, at least a portion of the plurality of pillars of the second conductivity type in the active region each having a width less than each of the widths of the plurality of pillars of the second conductivity type in the termination region; and a transition region disposed between the active region and the termination region, the transition region having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, each of the pillars of the second conductivity type in the transition region have the same width, each of the pillars of the second conductivity type in the transition region has a width greater than a width of a pillar from the plurality of pillars of the second conductivity type in the termination region. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A power device, comprising:
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an active region having a plurality of pillars of a first conductivity type alternately arranged with a plurality of pillars of a second conductivity type; a termination region having a plurality of pillars of the first conductivity type alternately arranged with a plurality of pillars of the second conductivity type, the plurality of pillars of the first conductivity type in the termination region have the same width, the plurality of pillars of the second conductivity type in the active region including a pillar having a width smaller than a width of a pillar from the plurality of pillars of the second conductivity type in the termination region; and a transition region disposed between the active region and the termination region, the transition region having at least one pillar of the first conductivity type adjacent to at least one pillar of the second conductivity type, the at least one pillar of the second conductivity type in the transition region has a width greater than the width of the pillar from the plurality of pillars of the second conductivity type in the termination region, at least one of the plurality of pillars of the first conductivity type in the termination region has a top portion including at least a portion of a diffusion ring, the diffusion ring being shallower than a P-well included in the active region and disposed between a pair of pillars of the second conductivity type in the active region. - View Dependent Claims (25)
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Specification