Trench polysilicon diode
First Claim
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1. A semiconductor structure comprising:
- a trench polysilicon diode for electrostatic discharge protection, said trench polysilicon diode comprising;
a N+ (P+) type substrate;
a N−
(P−
) type epitaxial region over said substrate;
a trench formed in said N−
(P−
) type epitaxial region, said trench comprising a top surface;
an insulating layer lining said trench;
a polysilicon filling said trench forming said top surface of said trench;
a P+ (N+) type doping polysilicon in said trench and formed by a P+ (N+) type electrostatic discharge (ESD) implant;
a N+ (P+) type doping polysilicon in said trench and formed by a N+ (P+) type source implant; and
a diode formed in said trench such that a portion of said diode is formed below said top surface of said trench.
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Abstract
Embodiments of the present invention include a method of manufacturing a trench transistor. The method includes forming a substrate of a first conductivity type and implanting a dopant of a second conductivity type, forming a body region of the substrate. The method further includes forming a trench in the body region and depositing an insulating layer in the trench and over the body region wherein the insulating layer lines the trench. The method further includes filling the trench with polysilicon forming a top surface of the trench and forming a diode in the body region wherein a portion of the diode is lower than the top surface of the trench.
22 Citations
16 Claims
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1. A semiconductor structure comprising:
a trench polysilicon diode for electrostatic discharge protection, said trench polysilicon diode comprising; a N+ (P+) type substrate; a N−
(P−
) type epitaxial region over said substrate;a trench formed in said N−
(P−
) type epitaxial region, said trench comprising a top surface;an insulating layer lining said trench; a polysilicon filling said trench forming said top surface of said trench; a P+ (N+) type doping polysilicon in said trench and formed by a P+ (N+) type electrostatic discharge (ESD) implant; a N+ (P+) type doping polysilicon in said trench and formed by a N+ (P+) type source implant; and a diode formed in said trench such that a portion of said diode is formed below said top surface of said trench. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A semiconductor device comprising:
-
N−
(P−
) type epitaxial means on N+(P+) type substrate means;polysilicon diode trench means in said epitaxial means; insulating layer means in said polysilicon diode trench means; P+(N+) type means in said polysilicon diode trench means; polysilicon diode means in said polysilicon diode trench means, wherein a portion of said polysilicon diode means is lower than a top surface of said polysilicon diode trench means. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification