Patent US4620986A successfully refreshed from Google Patents.
US4620986A
Expired / Lapsed
US
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MOS rear end processing
Assignee: Intel Corp
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Filing: 1985-10-15
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Granted: 1986-11-04
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Expires: 2005-10-15
Abstract
Abstract A process for the reduction of defect formation in conductive layers of semiconductor bodies during patterning, alloying and passivation. A film of low temperature spin-on-glass containing dye is formed on the conductive layer prior to patterning and any high temperature process greater than 200 degrees C. Hermetic passivation is achieved by depositing on the conductive layer a composite film consisting of a lower, tensile layer and an upper, compressive layer with the net force of the passivation film being tensile.
Inventors
- 👤 Leopoldo D. Yau
- 👤 Robert A. Gasser, Jr.
- 👤 Kenneth R. Week, Jr.
- 👤 Jick M. Yu
- 👤 David D. Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:59
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/60; H10P14/66; H10P14/662; H10P14/668; H10P14/6681; H10P14/6682; H10P76/00; H10P76/20; H10P76/204; H10P76/2041; H10P76/2043; H10W; H10W74/00; H10W74/10; H10W74/131; H10W74/137; H10P14/63; H10P14/6326; H10P14/6342; H10P14/68; Y; Y10; Y10S; Y10S438/00; Y10S438/937; Y10S438/942; Y10S438/948; Y10S438/95; Y10S438/958
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
47 words
A process for hermetic passivation of a conductive layer comprising the step of: forming a composite layer over said conductive layer, said composite layer consisting of a lower, tensile layer in the region above said conductive layer and an upper, compressive layer, whereby metal cracking is reduced.
Claim 2
Dependent Claim
47 words
A process for hermetic passivation of a conductive layer comprising the step of: forming a composite layer over said conductive layer, said composite layer consisting of a lower, tensile layer in the region above said conductive layer and an upper, compressive layer, whereby metal cracking is reduced.
Claim 3
Dependent Claim
50 words
The process defined by claim 1 wherein said composite film consists of tensile oxynitride formed in an atmosphere of silane, ammonia and nitrous oxide at constant temperature and energy with a subsequent reduction in pressure and nitrous oxide flow, such that said compressive layer is formed over said tensile layer.
Claim 4
Dependent Claim
29 words
The process as defined in claim 1 wherein said tensile layer is approximately 2 microns thick of oxynitride and said compressive layer is approximately 1 micron thick of oxynitride.
Claim 5
Dependent Claim
55 words
A process for hermetic passivation of a conductive layer comprising the steps of: a. forming a tensile layer on said conductive layer; b. forming a compressive layer over said tensile layer, said compressive layer being formed after said tensile layer is formed on said conductive layer, whereby metal cracking in said conductive layer is reduced.
Claim 6
Dependent Claim
55 words
A process for hermetic passivation of a conductive layer comprising the steps of: a. forming a tensile layer on said conductive layer; b. forming a compressive layer over said tensile layer, said compressive layer being formed after said tensile layer is formed on said conductive layer, whereby metal cracking in said conductive layer is reduced.
Claim 7
Dependent Claim
19 words
The process as defined in claim 4 wherein said tensile layer is pyrox and is approximately 2 microns thick.
Claim 8
Dependent Claim
19 words
The process as defined in claim 4 wherein said compressive layer is oxynitride and is approximately 1 micron thick.
Claim 9
Dependent Claim
19 words
The process as defined in claim 4 wherein said tensile layer is oxynitride and is approximately 1-2 microns thick.
Claim 10
Dependent Claim
27 words
The process as defined in claim 4 wherein said layers ar transparent to ultraviolet radiation, whereby erasure of erasable programmable read-only memories by ultraviolet light is allowed.
Claim 11
Dependent Claim
20 words
The process as defined in claim 4 wherein said layers have a refractive index equal to or less than 1.7.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |