US4632709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preventing melt-back in the production of aluminum-containing laser devices
Assignee: Sharp Corp
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Filing: 1985-09-30
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Granted: 1986-12-30
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Expires: 2005-09-30
Abstract
Abstract A process for the production of semiconductor devices includes: (1) forming a thin semiconductor film containing no aluminum on a first semiconductor layer containing aluminum that is disposed on a substrate one or more (2) forming channels on said thin semiconductor film in such a manner that the channel or channels reach or go through said first semiconductor layer to expose a portion of said substrate, resulting in a channelled substrate for succeeding crystal growth thereon, and (3) producing by epitaxial growth crystalline layers on said channelled substrate by the use of a crystal growth solution having a supersaturation which is high enough to prevent said first semiconductor layer from undergoing meltback.
Inventors
- 👤 Mototaka Taneya
- 👤 Sadayoshi Matsui
- 👤 Mitsuhiro Matsumoto
- 👤 Hiroshi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:01
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/20; H10P14/29; H10P14/2901; H10P14/2907; H10P14/2911; H10P14/26; H10P14/263; H10P14/265; H10P14/32; H10P14/3202; H10P14/3214; H10P14/3221; H10P14/34; H10P14/3402; H10P14/3414; H10P14/3421
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A process for the production of semiconductor devices comprising: (1) forming a thin semiconductor film containing no aluminum on a first semiconductor layer containing aluminum successively on a substrate, (2) forming one or more channels on said thin semiconductor film, said channels reach or go through said first semiconductor layer, to produce a channeled substrate for the succeeding crystal growth thereon, and (3) attaining the epitaxial growth of crystalline layers on said channelled substrate by the use of a crystal growth solution having a supersaturation which is high enough to prevent said first semiconductor layer from undergoing meltback.
Claim 2
Dependent Claim
98 words
A process for the production of semiconductor devices comprising: (1) forming a thin semiconductor film containing no aluminum on a first semiconductor layer containing aluminum successively on a substrate, (2) forming one or more channels on said thin semiconductor film, said channels reach or go through said first semiconductor layer, to produce a channeled substrate for the succeeding crystal growth thereon, and (3) attaining the epitaxial growth of crystalline layers on said channelled substrate by the use of a crystal growth solution having a supersaturation which is high enough to prevent said first semiconductor layer from undergoing meltback.
Claim 3
Dependent Claim
105 words
A process for the production of semiconductor devices according to claim 1, wherein said crystalline layers comprise a second semiconductor layer serving as an active region for emitting laser light, a third semiconductor layer positioned under said second semiconductor layer and on said third semiconductor film and a fourth semiconductor layer positioned above said second semiconductor layer, both said third and fourth layers having a wider forbidden band than said second semiconductor layer and the polarity of said third semiconductor layer being different from that of said fourth semiconductor layer, and said first semiconductor layer having a narrower forbidden band than said second semiconductor layer.
Claim 4
Dependent Claim
21 words
A process for the production of semiconductor devices according to claim 1, wherein said substrate has a plurality of striped channels.
Claim 5
Dependent Claim
21 words
A process for the production of semiconductor devices according to claim 2, wherein said substrate has a plurality of striped channels.
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |