Superjunction structures for power devices and methods of manufacture
First Claim
Patent Images
1. A power device comprising:
- at least one N-type epitaxial layer disposed on a substrate;
a plurality of trenches extending into the at least one N-type epitaxial layer, the plurality of trenches being filled with a P-type silicon material, the P-type silicon material in the plurality of trenches defining P-pillars, portions of the at least one N-type epitaxial layer separating the P-pillars defining N-pillars, such that the N-pillars and the P-pillars define alternating P-N-pillars;
an active region; and
a termination region surrounding the active region, the alternating P-N-pillars being disposed in both the active region and the termination region, the termination region including a predetermined number of floating P-pillars, each N-pillar located between two adjacent floating P-pillars of the predetermined number of floating P-pillars including an N-type surface region disposed along an upper surface, the N-type surface region having a lower doping concentration than a doping concentration of a remaining portion of the N-pillar in which the N-type surface region is disposed.
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Abstract
In a general aspect, a power device can include at least one N-type epitaxial layer disposed on a substrate and a plurality of N-pillars and P-pillars that define alternating P-N-pillars in the at least one N-type epitaxial layer. The power device can also include an active region and a termination region, where the termination region surrounds the active region. The alternating P-N-pillars can be disposed in both the active region and the termination region, where the termination region can include a predetermined number of floating P-pillars.
371 Citations
21 Claims
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1. A power device comprising:
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at least one N-type epitaxial layer disposed on a substrate; a plurality of trenches extending into the at least one N-type epitaxial layer, the plurality of trenches being filled with a P-type silicon material, the P-type silicon material in the plurality of trenches defining P-pillars, portions of the at least one N-type epitaxial layer separating the P-pillars defining N-pillars, such that the N-pillars and the P-pillars define alternating P-N-pillars; an active region; and a termination region surrounding the active region, the alternating P-N-pillars being disposed in both the active region and the termination region, the termination region including a predetermined number of floating P-pillars, each N-pillar located between two adjacent floating P-pillars of the predetermined number of floating P-pillars including an N-type surface region disposed along an upper surface, the N-type surface region having a lower doping concentration than a doping concentration of a remaining portion of the N-pillar in which the N-type surface region is disposed. - View Dependent Claims (2, 3, 4, 5, 6, 21)
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7. A power device comprising:
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at least one N-type epitaxial layer disposed on a substrate; a plurality of trenches extending into the at least one N-type epitaxial layer, the plurality of trenches being filled with a P-type silicon material, the P-type silicon material in the plurality of trenches defining P-pillars, portions of the at least one N-type epitaxial layer separating the P-pillars defining N-pillars, such that the N-pillars and the P-pillars define alternating P-N-pillars; an active region; and a termination region surrounding the active region, the alternating P-N-pillars being disposed in both the active region and the termination region, the alternating P-N-pillars in the termination region concentrically surrounding the active region and Including at least two floating P-pillars, each of the at least two floating P-pillars including a P-type ring disposed in an upper portion; a plurality of field plates disposed in the termination region, disposed on but insulated from the at least one N-type epitaxial layer, the plurality of field plates concentrically surrounding the active region; and a plurality of contacts, a contact of the plurality of contacts electrically connecting a field plate of the plurality of field plates and at least one of the P-type rings, the plurality of contacts being disposed directly above a corresponding floating P-pillar of the at least two floating P-pillars. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A power device comprising:
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an active region; a termination region surrounding the active region; a plurality of stripe-shaped pillars of alternating conductivity type disposed in and extending through the active region; and a plurality of octagon-shaped pillars of alternating conductivity type disposed in and extending through the termination region, the plurality of octagon-shaped pillars concentrically surrounding the active region. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification