MOS transistor with gate trench adjacent to drain extension field insulation
First Claim
1. An integrated circuit containing an MOS transistor, said integrated circuit comprising:
- a semiconductor substrate;
a drift region formed in said substrate, said drift region having a first conductivity type, such that said drift region extends to a top surface of said substrate;
an isolation dielectric layer formed at said top surface of said substrate over said drift region;
a gate trench formed in said substrate, such that said gate trench abuts said isolation dielectric layer;
a body well formed in said substrate adjacent to said drift region, such that said body well overlaps a first portion of a bottom surface of said gate trench, and such that said body well has an opposite conductivity type from said drift region;
a gate dielectric layer formed on exposed surfaces of said substrate in said gate trench;
a gate formed on said gate dielectric layer in said gate trench; and
a source diffused region formed in said body well, such that said source diffused region abuts said gate dielectric layer in said gate trench and overlaps a second portion of said bottom surface of said gate trench, said second portion of said bottom surface of said gate trench being within said first portion of said bottom surface of said gate trench, and such that said source diffused region has a same conductivity type as said drift region.
1 Assignment
0 Petitions
Accused Products
Abstract
An integrated circuit containing an MOS transistor with a trenched gate abutting an isolation dielectric layer over a drift region. The body well and source diffused region overlap the bottom surface of the gate trench. An integrated circuit containing an MOS transistor with a first trenched gate abutting an isolation dielectric layer over a drift region, and a second trenched gate located over a heavily doped buried layer. The buried layer is the same conductivity type as the drift region. A process of forming an integrated circuit containing an MOS transistor, which includes an isolation dielectric layer over a drift region of a drain of the transistor, and a gate formed in a gate trench which abuts the isolation dielectric layer. The gate trench is formed by removing substrate material adjacent to the isolation dielectric layer.
9 Citations
6 Claims
-
1. An integrated circuit containing an MOS transistor, said integrated circuit comprising:
-
a semiconductor substrate; a drift region formed in said substrate, said drift region having a first conductivity type, such that said drift region extends to a top surface of said substrate; an isolation dielectric layer formed at said top surface of said substrate over said drift region; a gate trench formed in said substrate, such that said gate trench abuts said isolation dielectric layer; a body well formed in said substrate adjacent to said drift region, such that said body well overlaps a first portion of a bottom surface of said gate trench, and such that said body well has an opposite conductivity type from said drift region; a gate dielectric layer formed on exposed surfaces of said substrate in said gate trench; a gate formed on said gate dielectric layer in said gate trench; and a source diffused region formed in said body well, such that said source diffused region abuts said gate dielectric layer in said gate trench and overlaps a second portion of said bottom surface of said gate trench, said second portion of said bottom surface of said gate trench being within said first portion of said bottom surface of said gate trench, and such that said source diffused region has a same conductivity type as said drift region. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification