Field-effect transistor having a high packing density and method for fabricating it
First Claim
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1. A field-effect transistor, comprising:
- a semiconductor body having a main area with isolated trenches formed therein, including a first trench, a second trench and a third trench, said semiconductor body having walls defining each of said trenches;
at least one source zone disposed in said walls defining said first trench;
at least one drain zone disposed in said walls defining said third trench;
a channel region disposed in said walls defining said second trench and disposed between said source zone and said drain zone;
an insulator layer disposed in said semiconductor body;
a gate electrode isolated from said channel region by said insulator layer;
a source electrode disposed in said first trench; and
a drain electrode disposed in said third trench.
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Abstract
A field-effect transistor has a semiconductor body with a main area, in which at least one source zone and one drain zone are introduced and which is provided with a gate electrode isolated from a channel region disposed between a source zone and a drain zone by an insulator layer. In the field-effect transistor, the source zone, the drain zone and the channel region are disposed in walls of a respective trench or recess formed in the semiconductor body.
117 Citations
18 Claims
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1. A field-effect transistor, comprising:
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a semiconductor body having a main area with isolated trenches formed therein, including a first trench, a second trench and a third trench, said semiconductor body having walls defining each of said trenches;
at least one source zone disposed in said walls defining said first trench;
at least one drain zone disposed in said walls defining said third trench;
a channel region disposed in said walls defining said second trench and disposed between said source zone and said drain zone;
an insulator layer disposed in said semiconductor body;
a gate electrode isolated from said channel region by said insulator layer;
a source electrode disposed in said first trench; and
a drain electrode disposed in said third trench. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A dynamic random access memory, comprising:
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a field-effect transistor, including;
a semiconductor body having a main area with isolated trenches formed therein, including a first trench, a second trench and a third trench, said semiconductor body having walls defining each of said trenches;
at least one source zone disposed in said walls defining said first trench;
at least one drain zone disposed in said walls defining said third trench;
a channel region disposed in said walls defining said second trench and disposed between said source zone and said drain zone;
an insulator layer disposed in said semiconductor body;
a gate electrode isolated from said channel region by said insulator layer;
a source electrode disposed in said first trench; and
a drain electrode disposed in said third trench.
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18. A CMOS-integrated circuit, comprising:
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a field-effect transistor, including;
a semiconductor body having a main area with isolated trenches formed therein, including a first trench, a second trench and a third trench, said semiconductor body having walls defining each of said trenches;
at least one source zone disposed in said walls defining said first trench;
at least one drain zone disposed in said walls defining said third trench;
a channel region disposed in said walls defining said second trench and disposed between said source zone and said drain zone;
an insulator layer disposed in said semiconductor body;
a gate electrode isolated from said channel region by said insulator layer;
a source electrode disposed in said first trench; and
a drain electrode disposed in said third trench.
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Specification