US5704973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for the uniform distribution of crystal defects upon a silicon single crystal
Assignee: Shin-Etsu Handotai Co Ltd
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Filing: 1996-06-18
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Granted: 1998-01-06
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Expires: 2016-06-18
Abstract
Abstract Proposed is an improvement in the method and single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method, according to which the distance between the surface of the melt of silicon contained in a crucible and the lower surface of the top wall of the crystal growing chamber is equal to or larger than the diameter of the crucible and the heat-insulating cylinder surrounding the crucible containing the melt of silicon and the heater has such a height as to reach the lower surface of the top wall of the chamber so as to keep the single crystal rod under growing is kept at a temperature not lower than 700° C. until reaching the lower surface of the top wall of the chamber thereby decreasing the density of the crystal defects of BMD type in the seed end of the single crystal rod as grown so that the uniformity in the distribution of BMD density is increased throughout the single crystal rod.
Inventors
- 👤 Masahiro Sakurada
- 👤 Wataru Sato
- 👤 Tomohiko Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:34
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C30B15/00; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method, the improvement which comprises keeping the length of time taken by a silicon single crystal rod under the process of growth to pass through a region where the temperature is in a range from 600° C. to 700° C. does not exceed 80 minutes.
Claim 2
Dependent Claim
60 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method, the improvement which comprises keeping the length of time taken by a silicon single crystal rod under the process of growth to pass through a region where the temperature is in a range from 600° C. to 700° C. does not exceed 80 minutes.
Claim 3
Dependent Claim
70 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method from a melt of silicon contained in a crucible held in a crystal growing chamber, the improvement which comprises keeping the single crystal rod under growth leaving the surface of the melt until reaching the lower surface of the top wall of the crystal growing chamber at a temperature of 700° C. or higher.
Claim 4
Dependent Claim
70 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method from a melt of silicon contained in a crucible held in a crystal growing chamber, the improvement which comprises keeping the single crystal rod under growth leaving the surface of the melt until reaching the lower surface of the top wall of the crystal growing chamber at a temperature of 700° C. or higher.
Claim 5
Dependent Claim
113 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method from a melt of silicon contained in a crucible held in a crystal growing chamber, the improvement which comprises keeping a distance between the surface of the melt of silicon contained in a crucible and the lower surface of the top wall of the crystal growing chamber to be equal to or larger than the diameter of the crucible and keeping the single crystal rod under growth leaving the surface of the melt of silicon until reaching the lower surface of the top wall of the crystal growing chamber at a tem-perature of 700° C. or higher.
Claim 6
Dependent Claim
113 words
In a method for the preparation of a silicon single crystal rod by the Czochralski method from a melt of silicon contained in a crucible held in a crystal growing chamber, the improvement which comprises keeping a distance between the surface of the melt of silicon contained in a crucible and the lower surface of the top wall of the crystal growing chamber to be equal to or larger than the diameter of the crucible and keeping the single crystal rod under growth leaving the surface of the melt of silicon until reaching the lower surface of the top wall of the crystal growing chamber at a tem-perature of 700° C. or higher.
Claim 7
Dependent Claim
86 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach a lower surface of a top wall of the crystal growing chamber.
Claim 8
Dependent Claim
86 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach a lower surface of a top wall of the crystal growing chamber.
Claim 9
Dependent Claim
126 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that the distance between the surface of a melt of silicon contained in the crucible and the lower surface of the top wall of the crystal growing chamber is equal to or larger than the diameter of the crucible and a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the the heat-insulating cylinder having such a height as to reach the lower surface of the top wall of the crystal growing chamber.
Claim 10
Dependent Claim
126 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that the distance between the surface of a melt of silicon contained in the crucible and the lower surface of the top wall of the crystal growing chamber is equal to or larger than the diameter of the crucible and a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the the heat-insulating cylinder having such a height as to reach the lower surface of the top wall of the crystal growing chamber.
Claim 11
Dependent Claim
123 words
In a single crystal growing chamber for a preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and a heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach a lower surface of the top wall of the crystal growing chamber so as to keep a region between a surface of the melt of silicon contained in the crucible and the lower surface of the top wall of the chamber at a temperature of 700° C. or higher.
Claim 12
Dependent Claim
123 words
In a single crystal growing chamber for a preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and a heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach a lower surface of the top wall of the crystal growing chamber so as to keep a region between a surface of the melt of silicon contained in the crucible and the lower surface of the top wall of the chamber at a temperature of 700° C. or higher.
Claim 13
Dependent Claim
162 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that the distance between a surface of the melt of silicon contained in the crucible and a lower surface of a top wall of the crystal growing chamber is equal to or larger than the diameter of the crucible and a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach the lower surface of the top wall of the crystal growing chamber so as to keep a region between the surface of the melt of silicon contained in the crucible and the lower surface of the top wall of the chamber at a temperature of 700° C. or higher.
Claim 14
Dependent Claim
162 words
In a single crystal growing chamber for the preparation of a single crystal rod of silicon by the Czochralski method from a melt of silicon contained in a crucible heated by means of a heater, the improvement which comprises that the distance between a surface of the melt of silicon contained in the crucible and a lower surface of a top wall of the crystal growing chamber is equal to or larger than the diameter of the crucible and a heat-insulating cylinder, which surrounds the crucible containing the melt of silicon and the heater to melt the silicon in the crucible, is provided, the heat-insulating cylinder having such a height as to reach the lower surface of the top wall of the crystal growing chamber so as to keep a region between the surface of the melt of silicon contained in the crucible and the lower surface of the top wall of the chamber at a temperature of 700° C. or higher.
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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) | 2001-01-05 | 2001-07-07 | 2002-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-05 | 2005-07-07 | 2006-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-05 | 2009-07-07 | 2010-01-06 | $7700.00 | Window Closed / Lapsed |