Field effect transistor with metal source/drain regions
First Claim
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1. A semiconductor device comprising:
- a gate electrode formed on a gate dielectric layer formed on a semiconductor channel region of a semiconductor film; and
a pair of source/drain regions formed adjacent to said semiconductor channel region on opposite sides of said gate electrode, said source/drain regions comprising a semiconductor portion adjacent to and in contact with said semiconductor channel and a metal portion adjacent to and in contact with said semiconductor portion.
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Abstract
A semiconductor device comprising a gate electrode formed on a gate dielectric layer formed on a semiconductor film. A pair of source/drain regions are formed adjacent the channel region on opposite sides of the gate electrode. The source and drain regions each comprise a semiconductor portion adjacent to and in contact with the semiconductor channel and a metal portion adjacent to and in contact with the semiconductor portion.
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Citations
26 Claims
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1. A semiconductor device comprising:
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a gate electrode formed on a gate dielectric layer formed on a semiconductor channel region of a semiconductor film; and
a pair of source/drain regions formed adjacent to said semiconductor channel region on opposite sides of said gate electrode, said source/drain regions comprising a semiconductor portion adjacent to and in contact with said semiconductor channel and a metal portion adjacent to and in contact with said semiconductor portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor device comprising:
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a semiconductor body formed on an oxide film formed on a substrate, said semiconductor body having a top surface and a pair of laterally opposite sidewalls;
a gate dielectric layer formed on the top surface and sidewalls of said semiconductor body;
a gate electrode formed on said gate dielectric layer on said top surface of said semiconductor body and on said sidewalls of said semiconductor body, said gate electrode having a pair of laterally opposite sidewalls;
a pair of sidewall spacers formed adjacent to said laterally opposite sidewalls of said gate electrode and on said top surface of said semiconductor body and adjacent to said sidewalls of said semiconductor body;
a pair of source/drain regions each comprising;
a source/drain extension formed in said semiconductor body beneath said sidewalls spacers; and
a metal portion in contact with said source/drain extension. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of forming a semiconductor device comprising:
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forming a gate electrode on a gate dielectric layer formed on a channel region of a semiconductor film;
forming a pair of source/drain regions on opposite sides of said gate electrode wherein said source/drain regions comprise a semiconductor portion adjacent to and in contact with said channel region and a metal portion adjacent to and in contact with said semiconductor portion. - View Dependent Claims (15, 16, 17)
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18. A method of forming a transistor comprising:
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forming a gate electrode having a pair of laterally opposite sidewalls on a gate dielectric layer formed on a semiconductor layer;
forming a pair of source/drain extensions in said semiconductor layer on opposite sides of said gate electrode;
forming a pair of sidewall spacers adjacent to said sidewalls of said gate electrode and on said source/drain extensions;
forming a pair of source/drain contact regions in said semiconductor layer on opposite sides of said sidewall spacers;
forming an interlayer dielectric adjacent to said sidewall spacers and over said source/drain contact regions;
etching a pair of contact openings through said interlayer dielectric to expose a portion of said source/drain contact regions;
etching away a portion of said source/drain contact regions to form a pair of etched-out source/drain contact regions; and
depositing a metal film into said contact openings and into said etched-out source/drain contact regions. - View Dependent Claims (19, 20, 21, 22)
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23. A method of forming a nonplanar transistor comprising:
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forming a semiconductor body having a top surface opposite a bottom surface formed on an insulating layer of an insulating substrate, said semiconductor body having a pair of laterally opposite sidewalls;
forming a gate dielectric layer on the top surface and sidewalls of said semiconductor body;
forming a gate electrode having a pair of laterally opposite sidewalls on said gate dielectric layer and on the top surface of said semiconductor body and adjacent to said gate dielectric layer on said sidewalls of said semiconductor body;
forming a pair of source/drain extensions in said semiconductor body on opposite sides of said gate electrode;
forming a pair sidewalls spacers adjacent to said gate electrode and on and adjacent to said source/drain extensions formed in said semiconductor body;
forming a pair of source/drain contact regions in said semiconductor body on opposite sides of said sidewall spacers;
forming an interlayer dielectric layer over and adjacent to said semiconductor body and adjacent to said sidewall spacers;
etching a pair of contact openings through said interlayer dielectric layer to said source/drain contact regions in said semiconductor body;
etching away a portion of said source/drain contact regions in said semiconductor body; and
depositing a metal film in said contact openings and in said etched away portion of said semiconductor body. - View Dependent Claims (24, 25, 26)
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Specification