US5370738A
Expired / Lapsed
US
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Compound semiconductor vapor phase epitaxial device
Assignee: Pioneer Corp
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Filing: 1993-02-03
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Granted: 1994-12-06
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Expires: 2013-02-03
Abstract
Abstract A compound semiconductor vapor phase epitaxial device comprises a cylindrical reactor vessel, a plurality of flow channels disposed in the reactor vessel, a crystal substrate disposed in one of the flow channels, a plurality of gas supply pipes for respectively supplying gas containing element of compound to be grown on the crystal substrate and at least one slit or linearly arranged fine holes communicating adjacent two flow channels so as to extend in a direction normal to a direction of the gas flow to form a laminate layer flow consisting of two or more than two gases at an upstream portion of location of the crystal substrate.
Inventors
- 👤 Atsushi Watanabe
- 👤 Hiroshi Amano
- 👤 Kazumasa Hiramatsu
- 👤 Isamu Akasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:45
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/02; C30B25/14; C23; C23C; C23C16/00; C23C16/44; C23C16/455
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
A compound semiconductor vapor phase epitaxial device comprising: a cylindrical reactor vessel; first and second adjacent flow channels disposed in the reactor vessel, said first and second flow channels each having substantially a rectangular cross section and said first and second flow channels having a common wall structure, at least one aperture being formed in said common wall structure extending in a direction normal to a direction of gas flows in said flow channels; a crystal substrate disposed in one of the flow channel means; and a plurality of gas supply means for respective gases containing elements of compounds to be grown on the crystal substrate; wherein said at least one aperture communicates the adjacent first and second flow channels with each other so as to form a laminar flow of the gases flowing in said channels at a location upstream of the crystal substrate.
Claim 2
Dependent Claim
145 words
A compound semiconductor vapor phase epitaxial device comprising: a cylindrical reactor vessel; first and second adjacent flow channels disposed in the reactor vessel, said first and second flow channels each having substantially a rectangular cross section and said first and second flow channels having a common wall structure, at least one aperture being formed in said common wall structure extending in a direction normal to a direction of gas flows in said flow channels; a crystal substrate disposed in one of the flow channel means; and a plurality of gas supply means for respective gases containing elements of compounds to be grown on the crystal substrate; wherein said at least one aperture communicates the adjacent first and second flow channels with each other so as to form a laminar flow of the gases flowing in said channels at a location upstream of the crystal substrate.
Claim 3
Dependent Claim
31 words
An epitaxial device according to claim 1, wherein said at least one aperture communicating the first and second flow channels is at least one slit formed in the common wall structure.
Claim 4
Dependent Claim
31 words
An epitaxial device according to claim 1, wherein said at least one aperture communicating the first and second flow channels is a plurality of slits formed in the common wall structure.
Claim 5
Dependent Claim
47 words
An epitaxial device according to claim 1, wherein said at least one aperture communicating the first and second flow channels is a plurality of fine holes arranged in a pattern extending linearly in a direction normal to the direction of the gas flows in the flow channels.
Claim 6
Dependent Claim
109 words
An epitaxial device according to claim 1, wherein said crystal substrate is disposed in the first flow channel, and further comprising gas supply means comprising first and second gas supply pipe means and first and second gas supply sources, an excessive first gas being supplied in the first flow channel through the first gas supply pipe means and a second gas for controlling growth rate of a crystal to be grown on the crystal substrate being supplied in the second flow channel through the second gas supply pipe means, and wherein a flow rate of the first gas is made larger than the flow rate of the second gas.
Claim 7
Dependent Claim
46 words
An epitaxial device according to claim 5, wherein a ratio of the flow rate of the first gas in the first flow channel with respect to the flow rate of the second gas in the second flow channel is within a range of 5 to 200.
Claim 8
Dependent Claim
18 words
An epitaxial device according to claim 6, wherein the ratio is within a range of 10 to 100.
Claim 9
Dependent Claim
27 words
An epitaxial device according to claim 5, wherein said second flow channel is closed at a downstream distal end portion thereof with respect to the gas flow.
Claim 10
Dependent Claim
36 words
An epitaxial device according to claim 5, wherein said first gas includes ammonium gas as a first material gas and said second gas includes a trimethylgallium gas or mixture gas of trimethylgallium gas and trimethylaluminium gas.
Claim 11
Dependent Claim
51 words
An epitaxial device according to claim 5, wherein said first flow channel has a bottom wall structure on which said crystal substrate is disposed, said bottom wall structure being tapered toward the downstream side of the gas flow so as to reduce a cross sectional area of said first flow channel.
Claim 12
Dependent Claim
38 words
An epitaxial device according to claim 10, wherein said at least one aperture is a plurality of slits formed in the common wall structure extending in a direction normal to a direction of gas flows in said channels.
Claim 13
Dependent Claim
29 words
An epitaxial device according to claim 5, further comprising a susceptor for supporting said crystal substrate, and coil means disposed around an outer peripheral surface of the reactor vessel.
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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) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |