Patent US4604636A successfully refreshed from Google Patents.
US4604636A
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Microcrystalline semiconductor method and devices
Assignee: Chronar Corp
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Filing: 1983-05-11
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Granted: 1986-08-05
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Expires: 2003-05-11
Abstract
Abstract The specification discloses a P-I-N device wherein a double heterojunction is provided by a body of intrinsic amorphous silicon sandwiched between two microcrystalline silicon layers.
Inventors
- 👤 Vikram L. Dalal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:16
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/40; H10D8/00; H10D8/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
21 words
A semiconductor device comprising a body of amorphous semiconductor sandwiched between two doped microcrystalline semiconductor layers of opposite types of conductivity.
Claim 2
Dependent Claim
21 words
A semiconductor device comprising a body of amorphous semiconductor sandwiched between two doped microcrystalline semiconductor layers of opposite types of conductivity.
Claim 3
Dependent Claim
17 words
Device of claim 1 wherein said amorphous semiconductor is an element from Group IV or alloys thereof.
Claim 4
Dependent Claim
21 words
Device of claim 1 wherein said microcrystalline semiconductor layers are selected from a class containing Group IV elements or alloys thereof.
Claim 5
Dependent Claim
24 words
Device of claim 1 wherein at least one of said microcrystalline semiconductor layers has a bandgap higher than the bandgap of said amorphous body.
Claim 6
Dependent Claim
14 words
Device of claim 1 wherein the amorphous semiconductor body is undoped or lightly doped.
Claim 7
Dependent Claim
22 words
Device of claim 1 wherein the semiconductor device is provided with ohmic contacts on the free surface of each doped semiconductor layer.
Claim 8
Dependent Claim
15 words
Device of claim 6 wherein one of said ohmic contacts is semi-transparent to optical radiation.
References Cited (Backward Citations)
US4498092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |