MOSFET STRUCTURE WITH GUARD RING
First Claim
1. A trench MOSFET structure with a guard ring near a termination area for breakdown voltage enhancement, comprising:
- a substrate comprising an epi layer region on a top thereof,a plurality of source and body regions formed in the epi layer;
a metal layer comprising a plurality of metal layer regions which are connected to respective source and body, and trench gate regions forming metal connections of the MOSFET;
a plurality of contact metal plugs connected to respective metal layer regions;
a plurality of gate structure filled with polysilicon formed on top of the epi layer;
an insulating layer deposited on the epi layer formed underneath the metal layer with a plurality of metal contact holes therein for contacting respective source and body regions; and
the guard ring wrapping around the trench gates which have wider trench width than those in active area, and the contact metal plug connecting to the top of the metal layer.
1 Assignment
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Accused Products
Abstract
A trench Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) structure with guard ling, includes: a substrate including an epi layer region on the top thereof a plurality of source and body regions formed in the epi layer; a metal layer including a plurality of metal layer regions which are connected to respective source and body regions forming metal connections of the MOSFET; a plurality of contact metal plugs connected to respective metal layer regions; a plurality of gate structure filled with polysilicon to be formed on top of the epi layer; an insulating layer deposited on the epi layer formed underneath the metal layer with a plurality of metal contact holes therein for contacting respective source and body regions; and a guard ring wrapping around the trench gates with contact metal plug underneath the gate metal layer
4 Citations
22 Claims
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1. A trench MOSFET structure with a guard ring near a termination area for breakdown voltage enhancement, comprising:
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a substrate comprising an epi layer region on a top thereof, a plurality of source and body regions formed in the epi layer; a metal layer comprising a plurality of metal layer regions which are connected to respective source and body, and trench gate regions forming metal connections of the MOSFET; a plurality of contact metal plugs connected to respective metal layer regions; a plurality of gate structure filled with polysilicon formed on top of the epi layer; an insulating layer deposited on the epi layer formed underneath the metal layer with a plurality of metal contact holes therein for contacting respective source and body regions; and the guard ring wrapping around the trench gates which have wider trench width than those in active area, and the contact metal plug connecting to the top of the metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for manufacturing a MOSFET structure with a guard ring, comprising the following steps:
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providing an epi layer on a heavily doped substrate; forming a plurality of trenches in the epi layer; covering a gate oxide layer on sidewalls and a bottom of the trenches; forming a conductive layer in the trenches to be used as a gate of MOSFET; forming a guard ring near by termination wrapping around the trench gates, which is used for gate metal contact; forming a plurality of body and source regions in the epi layer;
forming an insulating layer on the epi layer;forming a plurality of contact openings in the insulating layer and the source and body regions; forming contact metal plugs in the contact openings to directly contact with both source and body regions, and a metal layer on the insulating layer. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification