US4721683A
Expired / Lapsed
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Use of alkylphosphines and alkylarsines in ion implantation
Assignee: Wyeth Holdings LLC
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Filing: 1987-05-21
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Granted: 1988-01-26
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Expires: 2007-05-21
Abstract
Abstract Liquid alkylphosphines and alkylarsines are used as the ion source for improved ion implantation in the doping of semiconductor materials. A higher proportion of the total beam current is obtained as phosphorus and arsenic ion beam current in comparison with the use of gaseous phosphine and arsine, respectively, as the ion sources. Tertiarybutylphosphine and isobutylphosphine are the most preferred alkylphosphines, and tertiarybutylarsine is the most preferred alkylarsine for this use.
Inventors
- 👤 Jack E. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:49
CPC Classifications
H; H10; H10P; H10P30/00; H10P30/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
In a method for ion implantation to modify properties of semiconductor material which method comprises steps of forming P + or As + ions by ionization of an organic phosphorus or arsenic compound and directing a high energy ion beam of said ions to the material to be modified, the improvement wherein the organic phosphorus or arsenic compound that is ionized to make the ion beam is a compound defined by the formula R 1 R 2 R 3 P or R 1 R 2 R 3 As wherein R 1 is alkyl having two to five carbon atoms and each of R 2 and R 3 is hydrogen or alkyl having two to five carbon atoms.
Claim 2
Dependent Claim
117 words
In a method for ion implantation to modify properties of semiconductor material which method comprises steps of forming P + or As + ions by ionization of an organic phosphorus or arsenic compound and directing a high energy ion beam of said ions to the material to be modified, the improvement wherein the organic phosphorus or arsenic compound that is ionized to make the ion beam is a compound defined by the formula R 1 R 2 R 3 P or R 1 R 2 R 3 As wherein R 1 is alkyl having two to five carbon atoms and each of R 2 and R 3 is hydrogen or alkyl having two to five carbon atoms.
Claim 3
Dependent Claim
21 words
A method defined by claim 1 wherein R 1 is branched chain alkyl and R 2 and R 3 are H.
Claim 4
Dependent Claim
17 words
A method defined by claim 1 wherein the compound is R 1 R 2 R 3 P.
Claim 5
Dependent Claim
17 words
A method defined by claim 1 wherein the compound is R 1 R 2 R 3 As.
Claim 6
Dependent Claim
11 words
A method defined by claim 2 wherein the compound is tertiarybutylphosphine.
Claim 7
Dependent Claim
11 words
A method defined by claim 2 wherein the compound is isobutylphosphine.
Claim 8
Dependent Claim
11 words
A method defined by claim 2 wherein the compound is tertiarybutylarsine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |