US3767473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing semiconductor single crystals
Assignee: US Philips Corp
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Filing: 1971-12-09
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Granted: 1973-10-23
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Expires: 1991-12-09
Abstract
Abstract A method of manufacturing a compound in the form of a single crystal which comprises the synthesis of the compound and the formation of a single crystal. The synthesis is obtained by reaction in a closed space of a volatile component with a component in the liquid state after which the liquid phase is contacted with a surface of a seed crystal which initially is arranged at a higher level, after which crystallization is carried out. The invention may be used for manufacturing rods having good crystal properties, in particular the compounds III-V.
Inventors
- 👤 M Ayel
- 👤 J Besselere
- 👤 B Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/14; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S438/00; Y10S438/971
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method of claim 1, wherein the seed crystal is, at least during the initial and greater part of the reaction, is free from contact with the liquid phase and after the initial part of the reaction, a container holding the liquid phase and the seed crystal is tilted so as to contact the liquid phase with the seed crystal.
Claim 2
Dependent Claim
55 words
A method as claimed in claim 1 wherein the seed crystal during the initial and greater part of the reaction is free from contact with the liquid phase and during the last part of the reaction is contacted with the liquid phase by increase of the volume of the liquid phase during the reaction step.
Claim 3
Dependent Claim
39 words
A method of claim 1, characterized in that after the reactiOn step and prior to the crystallization step the seed crystal is partly dissolved by a local rise in temperature at the area where it contacts the liquid phase.
Claim 4
Dependent Claim
48 words
A method of claim 1 wherein during the crystallization the container holding the liquid phase and the seed crystal is tilted to correct the difference in specific volume of the liquid phase and the forming crystal and a single crystal of constant cross-section extended from said seed crystal.
Claim 5
Dependent Claim
53 words
A method of claim 1, wherein the location of the seed crystal in the container and the shape of the container are chosen so that after tilting, the variation in the cross-section of the liquid phase in the direction of crystallization is such that a single crystal of a constant cross-section is grown.
Claim 6
Dependent Claim
36 words
A method of claim 1 wherein the cross-section of the area of the seed crystal is chosen to be lower than one fourth of the cross-section of the area of the single crystal to be grown.
Claim 7
Dependent Claim
17 words
A method of claim 1, wherein during the crystallization the seed crystal projects from the liquid phase.
Claim 8
Dependent Claim
41 words
A method of claim 8, wherein the part of the surface of the seed crystal which faces the liquid phase and is wetted by the liquid phase is chosen to be between one fourth and three fourths of the said surface.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |