Patent FR770483A successfully refreshed from Google Patents.
Patent US5212394A successfully refreshed from Google Patents.
US5212394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound semiconductor wafer with defects propagating prevention means
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1992-08-19
•
Granted: 1993-05-18
•
Expires: 2012-08-19
Abstract
Abstract A compound semiconductor epitaxial wafer has a heteroepitaxial crystal layer grown on a compound semiconductor crystal substrate which has a substantially circular configuration and is free of dislocation defects at least in a central area surrounded by a cut-off that prevents defects from propagating radially inwardly into said central area.
Inventors
- 👤 Takashi Iwasaki
- 👤 Naoyuki Yamabayashi
- 👤 Yoshiki Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:15
CPC Classifications
C; C30; C30B; C30B15/00; C30B25/00; C30B25/02; C30B29/00; C30B29/10; C30B29/40; Y; Y10; Y10S; Y10S257/00; Y10S257/913; Y10T; Y10T428/00; Y10T428/21; Y10T428/219
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
115 words
A compound semiconductor epitaxial wafer, comprising a compound semiconductor single crystal substrate having a substantially circular configuration, a heteroepitaxial crystal layer formed on said compound semiconductor single crystal substrate, means for preventing a propagation of defects, said defects propagation preventing means forming part of said wafer and extending into said substrate to surround an area of said wafer prior to wafer processing so that defects starting outside said area during wafer processing of said wafer cannot propagate into said area surrounded by said defects propagation preventing means during said processing, and wherein said compound semiconductor single crystal substrate is free of dislocation defects at least within said area surrounded by said defects propagation preventing means.
Claim 2
Dependent Claim
115 words
A compound semiconductor epitaxial wafer, comprising a compound semiconductor single crystal substrate having a substantially circular configuration, a heteroepitaxial crystal layer formed on said compound semiconductor single crystal substrate, means for preventing a propagation of defects, said defects propagation preventing means forming part of said wafer and extending into said substrate to surround an area of said wafer prior to wafer processing so that defects starting outside said area during wafer processing of said wafer cannot propagate into said area surrounded by said defects propagation preventing means during said processing, and wherein said compound semiconductor single crystal substrate is free of dislocation defects at least within said area surrounded by said defects propagation preventing means.
Claim 3
Dependent Claim
61 words
The compound semiconductor wafer of claim 1, wherein said compound semiconductor single crystal substrate is made of a group III-V compound semiconductor, and the heteroepitaxial crystal layer formed thereon is a compound semiconductor crystal layer having a lattice constant substantially identical to the lattice constant of said group III-V compound semiconductor to such a degree that epitaxial crystal growth is possible.
Claim 4
Dependent Claim
19 words
The compound semiconductor wafer of claim 2, wherein said group III-V compound semiconductor is one of GaAs and InP.
Claim 5
Dependent Claim
47 words
The compound semiconductor wafer of claim 2, wherein said compound semiconductor having a lattice constant substantially identical to the lattice constant of said group III-V compound semiconductor includes a semiconductor containing at least two elements selected from a group consisting of Ga, As, Al, In and P.
Claim 6
Dependent Claim
22 words
The compound semiconductor wafer of claim 3, wherein said group III-V compound semiconductor is GaAs, and the heteroepitaxial crystals are of GaAlAs.
Claim 7
Dependent Claim
22 words
The compound wafer of claim 3, wherein said group III-V compound semiconductor is GaAs, and the heteroepitaxial crystal layer is of InGaP.
Claim 8
Dependent Claim
23 words
The compound semiconductor wafer of claim 3, wherein said group III-V compound semiconductor is GaAs, and the heteroepitaxial crystal layer is of InGaAlP.
Claim 9
Dependent Claim
23 words
The compound semiconductor wafer of claim 3, wherein said group III-V compound semiconductor is InP, and the heteroepitaxial crystal layer is of InGaAs.
Claim 10
Dependent Claim
23 words
The compound semiconductor wafer of claim 3, wherein said group III-V compound semiconductor is InP, and the heteroepitaxial crystal layer is of InGaAsP.
Claim 11
Dependent Claim
115 words
A compound semiconductor epitaxial wafer, comprising a compound semiconductor single crystal substrate, a heteroepitaxial crystal layer formed on said substrate, said substrate comprising a central area which is free of dislocation defects, said compound semiconductor wafer further comprising, as part of said wafer, means extending into said substrate for cutting off a linkage between a crystal portion in said central area of said substrate from a crystal portion outside said central area of said substrate, said cutting off means extending through said heteroepitaxial crystal layer and into said substrate prior to wafer processing, whereby said cutting off means suppresses propagation of crystal defects to said area free of dislocation defects during processing of said wafer.
Claim 12
Dependent Claim
115 words
A compound semiconductor epitaxial wafer, comprising a compound semiconductor single crystal substrate, a heteroepitaxial crystal layer formed on said substrate, said substrate comprising a central area which is free of dislocation defects, said compound semiconductor wafer further comprising, as part of said wafer, means extending into said substrate for cutting off a linkage between a crystal portion in said central area of said substrate from a crystal portion outside said central area of said substrate, said cutting off means extending through said heteroepitaxial crystal layer and into said substrate prior to wafer processing, whereby said cutting off means suppresses propagation of crystal defects to said area free of dislocation defects during processing of said wafer.
Claim 13
Dependent Claim
33 words
The compound semiconductor wafer of claim 10, wherein said means for cutting off is a groove defined by removing part of said heteroepitaxial crystal layer along an outer peripheral rim of said wafer.
Claim 14
Dependent Claim
26 words
The compound semiconductor wafer of claim 10, wherein said means for cutting off is a removed portion close to the outer peripheral rim of said wafer.
Claim 15
Dependent Claim
46 words
The compound semiconductor wafer of claim 10, wherein said means for cutting off is a film covering a portion close to the outer peripheral rim of said wafer, said film permitting selectively growing said heteroepitaxial crystal layer only in said central area free of dislocation defects.
Claim 16
Dependent Claim
17 words
The compound semiconductor wafer of claim 13, wherein said film is an Si x N y film.
Claim 17
Dependent Claim
17 words
The compound semiconductor wafer of claim 13, wherein said film is an Si x O y film.
References Cited (Backward Citations)
US3453508A
Cited
US3559006A
Cited
JPS52143761A
Cited
US4183039A
Cited
US4147571A
Cited
JPS57112074A
Cited
JPS60112694A
Cited
JPS61261300A
Cited
JPS61292340A
Cited
US4806996A
Cited
JPS6385082A
Cited
US4904336A
Cited
JPS63274684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |