US4985746A
Expired / Lapsed
US
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Semiconductor device and method of production
Assignee: Seiko Epson Corp
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Filing: 1987-07-16
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Granted: 1991-01-15
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Expires: 2007-07-16
Abstract
Abstract A novel semiconductor device and method of production of such a device are provided. Both the N and P channels of the novel semiconductor device are formed by contact self-alignment, thereby permitting high speed operation and high density integration to be realized. The formation of the channels by contact self-alignment is accomplished by depositing a P type polysilicon layer on an N well region and an N type polysilicon layer on a P well region. A silicide layer if formed over both the P and N type polysilicon layers to form a polycide.
Inventors
- 👤 Michio Asahina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:15
CPC Classifications
H; H10; H10D; H10D84/00; H10D84/80; H10D84/82; H10D84/83; H10D84/85; H10D84/859; H10D84/01; H10D84/0123; H10D84/0126; H10D84/0165; H10D84/0172; H10D84/0174; H10D84/0186; H10D84/0188; H10D84/02; H10D84/03; H10D84/038; H10W; H10W20/00; H10W20/40; H10W20/41; H10W20/44; H10W20/4451
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
201 words
A semiconductor device comprising: a substrate of a first conductivity type; a well region of a second conductivity type formed in said substrate; a first gate insulating film provided on a portion of said well region; a first polycrystalline silicon gate of the first conductivity type formed on the first gate insulating film; a second gate insulating film provided on a portion of said substrate; a second polycrystalline silicon gate of the second conductivity type formed on the second gate insulating film; first source and drain regions provided in the well region on either side of the first polycrystalline silicon gate; first polycrystalline silicon wiring of the first conductivity type drawn from the first drain region; second source and drain regions provided in the substrate on either side of the second polycrystalline silicon gate; second polycrystalline silicon wiring of the second conductivity type drawn from the second drain region, said wiring of said first conductive type drawn from the first drain region being directly connected to the wiring of the second conductive type; and a metal silicide film formed on substantially the entire surfaces of the polycrystalline silicon wiring and the polycrystalline silicon gates without contacting the source or drain regions.
Claim 2
Dependent Claim
201 words
A semiconductor device comprising: a substrate of a first conductivity type; a well region of a second conductivity type formed in said substrate; a first gate insulating film provided on a portion of said well region; a first polycrystalline silicon gate of the first conductivity type formed on the first gate insulating film; a second gate insulating film provided on a portion of said substrate; a second polycrystalline silicon gate of the second conductivity type formed on the second gate insulating film; first source and drain regions provided in the well region on either side of the first polycrystalline silicon gate; first polycrystalline silicon wiring of the first conductivity type drawn from the first drain region; second source and drain regions provided in the substrate on either side of the second polycrystalline silicon gate; second polycrystalline silicon wiring of the second conductivity type drawn from the second drain region, said wiring of said first conductive type drawn from the first drain region being directly connected to the wiring of the second conductive type; and a metal silicide film formed on substantially the entire surfaces of the polycrystalline silicon wiring and the polycrystalline silicon gates without contacting the source or drain regions.
Claim 3
Dependent Claim
38 words
The semiconductor device of claim 1, wherein a well region of a first conductive type is formed in said substrate and wherein said second gate insulating film is formed on said well region of said first conductive type.
Claim 4
Dependent Claim
34 words
The semiconductor device of claim 1, wherein the metal silicide film is selected from the group consisting of molybdenum disilicon (MoSi 2 ), tungsten disilicon (WSi 2 ) and titanium disilicon (TiSi 2 ).
Claim 5
Dependent Claim
55 words
The semiconductor device of claim 1, wherein the first drain region includes a first drain diffusion region along one side thereof and the second drain region includes a second drain diffusion region along one side thereof and the first drain diffusion region is separated from the second drain diffusion region by an element isolating region.
Claim 6
Dependent Claim
28 words
The semiconductor device of claim 4, wherein the first drain diffusion region is the first conductivity type and the second drain diffusion region is the second conductivity type.
Claim 7
Dependent Claim
29 words
The semiconductor device of claim 4, wherein the first polycrystalline silicon wiring is directly connected to the second polycrystalline silicon wiring on the surface of the element isolating region.
Claim 8
Dependent Claim
43 words
The semiconductor device of claim 4, wherein at least one of the source and drain regions extends under an end of a polycrystalline silicon gate along one side thereof and is in contact with an element isolating region along the opposite side thereof.
Claim 9
Dependent Claim
22 words
The semiconductor device of claim 1, further including an insulating material provided as a side wall of each of the gate electrodes.
Claim 10
Dependent Claim
42 words
The semiconductor device of claim 1, wherein each of the drain regions includes a low density drain region and a high density drain region and each of the source regions includes a low density source region and a high density source region.
Claim 11
Dependent Claim
49 words
The semiconductor device of claim 9, wherein the low density source and drain regions are thin and are adjacent a gate electrode and the high density source and drain regions have a thickness greater than the thickness of the low density regions and are distal from the gate electrode.
Claim 12
Dependent Claim
42 words
The semiconductor device of claim 8, wherein each of the drain regions includes a low density drain region and a high density drain region and each of the source regions includes a low density source region and a high density source region.
Claim 13
Dependent Claim
24 words
The semiconductor device of claim 11, wherein the low density source and drain regions are provided under the side wall of the gate electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |