US5092937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating semiconductors
Assignee: Leonardo UK Ltd
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Filing: 1990-07-13
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Granted: 1992-03-03
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Expires: 2010-07-13
Abstract
Abstract Semiconductors are treated with such surface-treating solutions as ultra-pure water, dilute hydrofluoric acid and an organic solvent and then subjected to removal of the surface-treating solutions remaining on the surface of the semiconductor in an inert gas atmosphere of high purity while contacting the surface of the surface-treated semiconductor only with the inert gas of high purity, whereby contamination with impurities on atom level from the atmosphere can be prevented.
Inventors
- 👤 Mototsugu Ogura
- 👤 Keiichi Kagawa
- 👤 Yuichi Hirofuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:27
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
189 words
A process for treating a semiconductor, comprising: continuously maintaining a semiconductor substrate in an atmosphere of high purity inert gas while performing: (a) a first step of treating a surface of said semiconductor substrate in an atmosphere of an inert gas of high purity including filling a first container with a surface-treating solution, covering a surface of said surface-treating solution in said first container with a high purity inert gas, and dipping said substrate into said solution in said first container to remove surface parts of said substrate; (b) a second step of removing remaining surface-treating solution from said substrate in an atmosphere of inert gas of high purity including filling a second container with ultra-pure water, covering a surface of said ultra-pure water in said second container with a high purity inert gas, and subsequent to said dipping in step (a), dipping said substrate into said ultra-pure water in said second container; and (c) a third step of drying said substrate to remove ultra-pure water remaining thereon, said substrate being continuously kept in an atmosphere of inert gas of high purity in the first, second and third steps.
Claim 2
Dependent Claim
189 words
A process for treating a semiconductor, comprising: continuously maintaining a semiconductor substrate in an atmosphere of high purity inert gas while performing: (a) a first step of treating a surface of said semiconductor substrate in an atmosphere of an inert gas of high purity including filling a first container with a surface-treating solution, covering a surface of said surface-treating solution in said first container with a high purity inert gas, and dipping said substrate into said solution in said first container to remove surface parts of said substrate; (b) a second step of removing remaining surface-treating solution from said substrate in an atmosphere of inert gas of high purity including filling a second container with ultra-pure water, covering a surface of said ultra-pure water in said second container with a high purity inert gas, and subsequent to said dipping in step (a), dipping said substrate into said ultra-pure water in said second container; and (c) a third step of drying said substrate to remove ultra-pure water remaining thereon, said substrate being continuously kept in an atmosphere of inert gas of high purity in the first, second and third steps.
Claim 3
Dependent Claim
63 words
A process as in claim 1, wherein the third step comprises placing said substrate in an atmosphere of an alcohol vapor to replace ultra-pure water remaining on the substrate with the alcohol vapor and then removing the substrate from the atmosphere of alcohol vapor, while shielding the surface of the atmosphere of alcohol vapor with an atmosphere of inert gas of high purity.
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) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |