US5677208A
Expired / Lapsed
US
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Method for making FET having reduced oxidation inductive stacking fault
Assignee: Denso Corp
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Filing: 1995-03-24
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Granted: 1997-10-14
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Expires: 2015-03-24
Abstract
Abstract An improved manufacturing method for a semiconductor device, which can reduce process inductive fault such as oxidation inductive stacking fault (OSF) and contribute to the improvement of the electric characteristics of the semiconductor device, is disclosed. A thermal oxide film is formed on a semiconductor substrate, then a nitride film is formed and a medium temperature heat treatment is provided to the semiconductor substrate within a temperature range from 600° C. to 1,000° C., whereby an interstitial oxygen concentration can be lowered. Subsequently, ion implantation, etc. are provided as a well region forming process, and a drive-in process is performed by means of a high temperature heat treatment. At this time, ion implantation dose is set to 9×10 13 cm -2 ! or less, and the temperature of the heat treatment is lowered or the duration of the teat treatment is shortened. After this, an element separation layer process is performed, and a gate oxide film, a gate electrode, a source/drain layer, a CVD oxide film, a contact hole and a metal wire are formed.
Inventors
- 👤 Hiroyasu Itou
- 👤 Hideya Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:50
CPC Classifications
H; H10; H10W; H10W46/00; H10D; H10D84/00; H10D84/01; H10D84/0123; H10D84/0126; H10D84/0144; H10D84/02; H10D84/03; H10D84/038; H10P; H10P32/00; H10P32/10; H10P32/14; H10P32/1404; H10P32/1406; H10P32/17; H10P32/171; H10P36/00; H10P36/20; H10W46/301; H10W46/501; H10W46/503
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
101 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate wherein an interstitial concentration of oxygen in said semiconductor substrate is increased; lowering said interstitial oxygen concentration in said semiconductor substrate which includes heat treating said semiconductor substrate within a temperature range from 600° C. to 1,000° C.; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; and forming a transistor in said deep junction.
Claim 2
Independent Claim
101 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate wherein an interstitial concentration of oxygen in said semiconductor substrate is increased; lowering said interstitial oxygen concentration in said semiconductor substrate which includes heat treating said semiconductor substrate within a temperature range from 600° C. to 1,000° C.; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; and forming a transistor in said deep junction.
Claim 3
Dependent Claim
50 words
A method for manufacturing a semiconductor device according to claim 1, wherein said interstitial oxygen concentration lowering step includes a step of forming a thin film having an etching selectivity with respect to said thermal oxide film, said thin film forming step being provided before said medium temperature heat treatment.
Claim 4
Dependent Claim
52 words
A method for manufacturing a semiconductor device according to claim 2, further comprising a step of forming a position detecting mark on said semiconductor substrate with said thin film, and wherein said transistor forming step includes a step of forming said transistor within said specified region according to said position detecting mark.
Claim 5
Dependent Claim
26 words
A method for manufacturing a semiconductor device according to claim 1, further comprising a step of removing said thermal oxide film after said junction forming step.
Claim 6
Dependent Claim
26 words
A method for manufacturing a semiconductor device according to claim 2, further comprising a step of removing said thermal oxide film after said junction forming step.
Claim 7
Dependent Claim
26 words
A method for manufacturing a semiconductor device according to claim 3, further comprising a step of removing said thermal oxide film after said junction forming step.
Claim 8
Independent Claim
149 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate; forming a first thin film, said first thin forming step including a medium temperature heat treatment within a temperature range from 600° C. to 1,000° C.; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; forming a thick thermal filed oxide film, which includes steps of: forming a second thin film without removing said thermal oxide film, and selectively forming a thick thermal field oxide film on said surface of said semiconductor substrate by thermal oxidation using said second thin film as a mask member, thereby said thick thermal field oxide film separates element regions; and forming a transistor in said deep junction.
Claim 9
Independent Claim
149 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate; forming a first thin film, said first thin forming step including a medium temperature heat treatment within a temperature range from 600° C. to 1,000° C.; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; forming a thick thermal filed oxide film, which includes steps of: forming a second thin film without removing said thermal oxide film, and selectively forming a thick thermal field oxide film on said surface of said semiconductor substrate by thermal oxidation using said second thin film as a mask member, thereby said thick thermal field oxide film separates element regions; and forming a transistor in said deep junction.
Claim 10
Independent Claim
151 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate; forming a thin film on said thermal oxide film, wherein a temperature ranging from 600° C. to 1,000° C. is imposed on said semiconductor substrate; patterning said thin film into a specified pattern; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; selectively forming a thick thermal field oxide film on said surface of said semiconductor substrate by thermal oxidation which is performed without removing said thermal oxide film and said patterned thin film so as to use said patterned thin film as a mask member, thereby said thick thermal field oxide film separates element regions; and forming a transistor by using said deep junction.
Claim 11
Independent Claim
151 words
A method for manufacturing a semiconductor device comprising the steps of: forming a thermal oxide film on a surface of a semiconductor substrate; forming a thin film on said thermal oxide film, wherein a temperature ranging from 600° C. to 1,000° C. is imposed on said semiconductor substrate; patterning said thin film into a specified pattern; implanting ions into a specified region of said semiconductor substrate; forming a deep junction within said semiconductor substrate by performing a high temperature heat treatment at a temperature of over 1,000° C.; selectively forming a thick thermal field oxide film on said surface of said semiconductor substrate by thermal oxidation which is performed without removing said thermal oxide film and said patterned thin film so as to use said patterned thin film as a mask member, thereby said thick thermal field oxide film separates element regions; and forming a transistor by using said deep junction.
Claim 12
Dependent Claim
39 words
A method for manufacturing a semiconductor device according to claim 7, wherein said first thin film forming step includes a step of forming said first thin film within a film forming temperature range from 600° C. to 1,000° C.
Claim 13
Dependent Claim
37 words
A method for manufacturing a semiconductor device according to claim 8, wherein said thin film forming step includes a step of forming said thin film within a film forming temperature range from 600° C. to 1,000° C.
Claim 14
Dependent Claim
41 words
A method for manufacturing a semiconductor device according to claim 7, wherein said first think film forming step includes a step of performing a heat treatment within a temperature range from 600° C. to 1,000° C. after forming said thin film.
Claim 15
Dependent Claim
40 words
A method for manufacturing a semiconductor device according to claim 8, wherein said thin film forming step includes a step of performing a heat treatment within a temperature range from 600° C. to 1,000° C. after forming said thin film.
Claim 16
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 1, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 17
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 2, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 18
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 3, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 19
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 4, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 20
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 5, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 21
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 6, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 22
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 7, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 23
Dependent Claim
37 words
The method for manufacturing a semiconductor device according claim 8, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 24
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 9, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 25
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 10, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 26
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 11, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 27
Independent Claim
38 words
The method for manufacturing a semiconductor device according claim to 12, wherein said implanting step comprises implanting ions at a dose rate of 9×10 13 (cm -2 ) or less into said specified region of said semiconductor substrate.
Claim 28
Dependent Claim
54 words
The method for manufacturing a semiconductor device according to claim 1, further comprising a step of heating the semiconductor substrate at a temperature in a range from 600° C. to 1,000° C. after the thermal oxide film forming step to thereby lower the interstitial oxygen concentration caused by the thermal oxide film forming step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-10-13 | 2001-04-14 | 2001-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-13 | 2005-04-14 | 2005-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-13 | 2009-04-14 | 2009-10-14 | $7700.00 | Window Closed / Lapsed |