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US4814854A Expired / Lapsed US ⏱️ 0.0 years remaining

Integrated circuit device and process with tin-gate transistor

Assignee: Texas Instruments Inc
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Filing: 1986-12-05
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Granted: 1989-03-21
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Expires: 2006-12-05
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Abstract

Abstract A new integrated circuit structure which includes two types of active devices: a first set of IGFETs has silicide gates, and the second set has TiN gates. The same TiN thin film layer also provides local interconnect. Optionally the TiN-gate devices may be used for high-voltage devices and the silicide-gate devices used for logic devices.

Inventors

  • 👤 Howard L. Tigelaar
  • 👤 Roger A. Haken
  • 👤 Thomas C. Holloway
  • 👤 Robert Groover, III

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 22:04
CPC Classifications
H; H10; H10B; H10B41/00; H10B41/40; H10B10/00; H10B10/12; H10B10/125; H10B41/42; H10B41/43; H10B41/48; H10D; H10D84/00; H10D84/01; H10D84/0123; H10D84/0126; H10D84/0149; H10D84/02; H10D84/03; H10D84/038; H10D84/80; H10D84/82; H10D84/83; H10D84/85; H10W; H10W20/00; H10W20/01; H10W20/031; H10W20/0698; Y; Y10; Y10S; Y10S257/00; Y10S257/90; Y10S257/915

Claims Analysis

Total Claims: 16
Claim 1
Independent Claim 191 words
An integrated circuit device comprising: a substrate, including device isolation regions defining a plurality of moat area of exposed semiconducting material at a surface thereof; a first insulated-gate field effect transistor formed in a first moat area and having a portion of a first patterned conductive layer comprising polycrystalline silicon as a gate, and having source/drain regions; a connection formed of a second patterned conductive layer comprising titanium nitride, in contact with a source/drain region of said first insulated-gate field effect transistor and in contact with a conductive layer in a second moat area; a second insulated-gate field effect transistor comprising: first and second source/drains separated by a channel in a third moat area, a first gate-edge extension comprising a portion of said first patterned conductive layer disposed over said channel area near said first source/drain, a gate formed of a portion of said second patterned thin film conductive layer disposed over said channel area and laterally separated from said first source/drain by said first gate-edge extension, wherein said first gate-edge extension is capacitively coupled to said gate, and wherein said first gate-edge extension is capacitively coupled to said first source/drain.
Claim 2
Dependent Claim 191 words
An integrated circuit device comprising: a substrate, including device isolation regions defining a plurality of moat area of exposed semiconducting material at a surface thereof; a first insulated-gate field effect transistor formed in a first moat area and having a portion of a first patterned conductive layer comprising polycrystalline silicon as a gate, and having source/drain regions; a connection formed of a second patterned conductive layer comprising titanium nitride, in contact with a source/drain region of said first insulated-gate field effect transistor and in contact with a conductive layer in a second moat area; a second insulated-gate field effect transistor comprising: first and second source/drains separated by a channel in a third moat area, a first gate-edge extension comprising a portion of said first patterned conductive layer disposed over said channel area near said first source/drain, a gate formed of a portion of said second patterned thin film conductive layer disposed over said channel area and laterally separated from said first source/drain by said first gate-edge extension, wherein said first gate-edge extension is capacitively coupled to said gate, and wherein said first gate-edge extension is capacitively coupled to said first source/drain.
Claim 3
Dependent Claim 30 words
The device of claim 1, wherein said second insulated-gate field effect transistor further comprises a sidewall dielectric filament on the sidewall of said first gate-edge extension nearest said first source/drain.
Claim 4
Dependent Claim 19 words
The device of claim 2, wherein said first gate-edge extension has a sidewall dielectric filament on both sidewalls thereof.
Claim 5
Dependent Claim 34 words
The device of claim 1, wherein said second insulated-gate field effect transistor further comprises a lightly-doped drain extension region laterally extending from said first source/drain on the side thereof nearest said first gate-edge extension.
Claim 6
Dependent Claim 53 words
The device of claim 1, wherein said second insulated-gate field effect transistor further comprises a second gate-edge extension comprising a portion of said first patterned thin film conductive layer disposed over said channel area near said second source/drain, wherein said gate is laterally separated from said second source/drain by said second gate-edge extension.
Claim 7
Dependent Claim 54 words
The device of claim 1, wherein said device isolation regions define a PMOS first moat region having p+ source/drain regions therein and an NMOS first moat region having n+ source/drain regions therein, and wherein said second conductive layer is patterned to also provide connections from a p+ source/drain region to an n+ source/drain regions.
Claim 8
Dependent Claim 35 words
The device of claim 1, wherein some portions of said second conductive layer overlie a thin film insulator over at least some respective portions of said first patterned thin film conductive layer to define capacitors.
Claim 9
Dependent Claim 23 words
The device of claim 1, wherein said second conductive layer predominantly comprises titanium nitride, and also comprises at least 5% atomic of oxygen.
Claim 10
Dependent Claim 17 words
The device of claim 1, wherein said second conductive layer is less than 2000 Å Angstroms thick.
Claim 11
Dependent Claim 15 words
The device of claim 1, wherein said second conductive layer consists essentially of titanium nitride.
Claim 12
Dependent Claim 36 words
The device of claim 1, wherein all portions of said said second conductive layer which are more than 50 Å Angstroms away from an upper or lower surface thereof consist of more than 90% titanium nitride.
Claim 13
Dependent Claim 21 words
The device of claim 1, wherein said first conductive thin film layer is polycrystalline and comprises a substantial fraction of silicon.
Claim 14
Dependent Claim 27 words
The device of claim 1, wherein said first conductive thin film layer of said first insulated-gate field effect transistor is clad with a layer of titanium silicide.
Claim 15
Dependent Claim 24 words
The device of claim 1, wherein said source/drain regions of said first insulated-gate field effect transistor are clad with a layer of titanium silicide.
Claim 16
Dependent Claim 25 words
The device of claim 14, wherein said connection is in contact with the silicide layer of said source/drain region with which it is in contact.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-03-20 1992-09-19 1993-03-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-03-20 1996-09-19 1997-03-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-03-20 2000-09-19 2001-03-21 $7700.00 Window Closed / Lapsed

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