Patent US5067437A successfully refreshed from Google Patents.
US5067437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for coating of silicon semiconductor surface
Assignee: Toshiba Corp
•
Filing: 1989-03-28
•
Granted: 1991-11-26
•
Expires: 2009-03-28
Abstract
Abstract An apparatus for forming a film on the silicon surface of an intermediate semiconductor device, wherein a silicon oxide film on the intermediate semiconductor device is etched out with an active species without damage to the silicon surface, the difference between the etching speeds of the silicon and the silicon oxide film being 5 or less. Immediately after the etching, another film is formed on the surface of the silicon without the surface being exposed to the atmosphere. Thus, the etching of the silicon oxide film and the forming of another film can be performed in the same chamber or different chambers.
Inventors
- 👤 Tohru Watanabe
- 👤 Katsuya Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:14
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0418; H10P72/0421; H10P50/00; H10P50/20; H10P50/28; H10P50/282; H10P50/283; H10W; H10W20/00; H10W20/01; H10W20/031; H10W20/056; H10W20/057; Y; Y10; Y10S; Y10S438/00; Y10S438/913
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
197 words
An apparatus for forming a covering film on the silicon surface of an intermediate semiconductor device, comprising: first means for forming an active species, and second means for removing an oxide film and forming a covering film; said first means being a flow ratio regulating means for regulating a flow ratio of gaseous oxygen to a gaseous halogen compound, and discharge means for forming an active species from said gases; said second means including a casing for housing an intermediate semiconductor device formed of silicon and for introducing said active species, a heating means for heating said intermediate semiconductor device to remove a silicon oxide film formed on said silicon surface of the intermediate semiconductor device by using said active species, temperature regulating means for regulating the temperature of said intermediate semiconductor device, and film forming means for forming a covering film on said silicon surface of said intermediate semiconductor device after said silicon oxide film has been removed therefrom; said flow ratio regulating means and said temperature regulating means cooperatively regulating said flow ratio and said temperature, respectively, the ratio of the etching speeds of said silicon and said silicon oxide film being 5 or less.
Claim 2
Independent Claim
197 words
An apparatus for forming a covering film on the silicon surface of an intermediate semiconductor device, comprising: first means for forming an active species, and second means for removing an oxide film and forming a covering film; said first means being a flow ratio regulating means for regulating a flow ratio of gaseous oxygen to a gaseous halogen compound, and discharge means for forming an active species from said gases; said second means including a casing for housing an intermediate semiconductor device formed of silicon and for introducing said active species, a heating means for heating said intermediate semiconductor device to remove a silicon oxide film formed on said silicon surface of the intermediate semiconductor device by using said active species, temperature regulating means for regulating the temperature of said intermediate semiconductor device, and film forming means for forming a covering film on said silicon surface of said intermediate semiconductor device after said silicon oxide film has been removed therefrom; said flow ratio regulating means and said temperature regulating means cooperatively regulating said flow ratio and said temperature, respectively, the ratio of the etching speeds of said silicon and said silicon oxide film being 5 or less.
Claim 3
Dependent Claim
16 words
An apparatus according to claim 1, further comprising means for reducing the pressure within said casing.
Claim 4
Dependent Claim
37 words
An apparatus according to claim 1, wherein said film forming means comprises means for introducing a gas into said casing for the deposition of material on said silicon surface of said intermediate semiconductor by the CVD method.
Claim 5
Dependent Claim
31 words
An apparatus according to claim 1, wherein said casing is divided into a first chamber for removing said silicon oxide film and a second chamber for performing said covering film forming.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 4, wherein said second chamber comprises said film forming means and said film forming means is a means for performing sputtering.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 1, wherein said casing comprises one chamber for removing said silicon oxide film and for performing said film forming, sequentially.
Claim 8
Dependent Claim
60 words
An apparatus according to claim 1, wherein said flow ratio regulating means and said temperature regulating means regulate said flow ratio and said temperature, respectively, so as to satisfy the following formula: Y≧-0.13T+106.3 where Y is a percent flow ratio of said oxygen gas to said mixed gas, and T is the temperature (° C.) of said intermediate semiconductor device.
Claim 9
Dependent Claim
16 words
An apparatus according to claim 7, further comprising means for reducing the pressure within said casing.
Claim 10
Dependent Claim
37 words
An apparatus according to claim 7, wherein said film forming means comprises means for introducing a gas into said casing for the deposition of material on said silicon surface of said intermediate semiconductor by the CVD method.
Claim 11
Dependent Claim
30 words
An apparatus according to claim 7, wherein said casing is divided into a first chamber for removing said silicon oxide film and a second chamber for performing said film forming.
Claim 12
Dependent Claim
26 words
An apparatus according to claim 10, wherein said second chamber comprises said film forming means and said film forming means is a means for performing sputtering.
Claim 13
Dependent Claim
26 words
An apparatus according to claim 7, wherein said casing comprises one chamber both for removing said silicon oxide film and for performing said film forming, sequentially.
References Cited (Backward Citations)
US4138306A
Cited
JPS5362982A
Cited
EP0052227A1
Cited
EP0157052A1
Cited
US4484979A
Cited
JPS60249328A
Cited
US4581100A
Cited
US4693777A
Cited
JPS61179868A
Cited
US4605479A
Cited
JPS6220331A
Cited
JPS62221116A
Cited
JPS62221163A
Cited
EP0242207A2
Cited
US4825808A
Cited
US4866346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |