US5196355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simox materials through energy variation
Assignee: Ibis Technology Corp
•
Filing: 1990-12-14
•
Granted: 1993-03-23
•
Expires: 2010-12-14
Abstract
Abstract A method of manufacturing SIMOX heterostructures using a single implant sequence and an increasing range of ion beam energies is disclosed. The method produces SIMOX materials having thin, continuous buried oxide layers having sharp interfaces and which are substantially free of silicon islands.
Inventors
- 👤 Andrew B. Wittkower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:25
CPC Classifications
H; H10; H10P; H10P30/00; H10P30/20; H10P30/208; H10P30/209; H10P30/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A method of producing a buried insulating layer in a silicon substrate comprising the steps of: implanting oxygen ions into a silicon substrate in a single implant sequence to form an implant layer, wherein the implantation energy of said oxygen ions increases throughout said implant sequence such that the implanted ions are concentrated at a lower interface between the implant layer and the underlaying substrate to retard integration of silicon ions into the implant layer during subsequent annealing; and annealing said substrate to form a buried layer of SiO 2 in said silicon wafer, said buried layer lying between a overlying silicon body and an underlying bulk silicon region, and said buried layer being substantially free of silicon islands.
Claim 2
Independent Claim
119 words
A method of producing a buried insulating layer in a silicon substrate comprising the steps of: implanting oxygen ions into a silicon substrate in a single implant sequence to form an implant layer, wherein the implantation energy of said oxygen ions increases throughout said implant sequence such that the implanted ions are concentrated at a lower interface between the implant layer and the underlaying substrate to retard integration of silicon ions into the implant layer during subsequent annealing; and annealing said substrate to form a buried layer of SiO 2 in said silicon wafer, said buried layer lying between a overlying silicon body and an underlying bulk silicon region, and said buried layer being substantially free of silicon islands.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the dose of oxygen ions implanted at each ion beam energy is a constant subcritical dose.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the implantation energy of said oxygen ions increases from about 100 keV to about 400 keV during said sequence.
Claim 5
Dependent Claim
24 words
The method of claim 3 wherein the implantation energy of said oxygen ions increases about 150 keV to about 200 keV during said sequence.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the implantation energy of said oxygen ions increases in multiple discrete increments.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the implantation energy of said oxygen ions increases in a continuous sequence.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein said substrate is annealed at a temperature within the range of about 1100° C. to 1400° C.
Claim 9
Dependent Claim
23 words
The method of claim 7 wherein said substrate is annealed at a temperature within the range of about 1300° C. to 1375° C.
References Cited (Backward Citations)
JPS5331971A
Cited
US4509990A
Cited
US4749660A
Cited
US4863878A
Cited
EP0298794A1
Cited
US4975126A
Cited
US4804633A
Cited
US5080730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |