US4045251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing an inversely operated transistor
Assignee: Siemens AG
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Filing: 1976-02-02
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Granted: 1977-08-30
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Expires: 1996-02-02
Abstract
Abstract A process for producing an inversely operated transistor in a body of semiconductor material which has arranged on its surface collector, base and emitter zones and wherein the base is doped by ion implantation so that minority charge carriers injected from the emitter zone into the base zone are accelerated in the direction towards the collector zone due to an inner drift field in the base zone.
Inventors
- 👤 Juergen Graul
- 👤 Helmuth Murrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:19
CPC Classifications
H; H10; H10P; H10P30/00; H10P30/20; H10P30/21; H10D; H10D10/00; H10D10/40; H10D10/461; H10D62/00; H10D62/10; H10D62/17; H10D62/177; H10D62/60; H10P30/202; H10P30/204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A process for the production of an inversely operated transistor in a semiconductor body on the surface of which are formed in spaced arrangement, collector region, then a base region and an emitter region wherein said base region is doped by ion implantation in such a manner that minority charge carriers injected from the emitter region into the base region are accelerated in the direction towards the collector region as a result of an inner drift field in the base region, wherein the ion implantation of the base region is accomplished in one step and wherein so as to dope the base region with a doping concentration of approximately 2 . 10 17 /cm 3 in the vicinity of the emitter region, and wherein said base region has dimensions between 0.7 um and 0.4 um, an implantation energy level of approximately 300 keV is used.
Claim 2
Dependent Claim
145 words
A process for the production of an inversely operated transistor in a semiconductor body on the surface of which are formed in spaced arrangement, collector region, then a base region and an emitter region wherein said base region is doped by ion implantation in such a manner that minority charge carriers injected from the emitter region into the base region are accelerated in the direction towards the collector region as a result of an inner drift field in the base region, wherein the ion implantation of the base region is accomplished in one step and wherein so as to dope the base region with a doping concentration of approximately 2 . 10 17 /cm 3 in the vicinity of the emitter region, and wherein said base region has dimensions between 0.7 um and 0.4 um, an implantation energy level of approximately 300 keV is used.
Claim 3
Dependent Claim
151 words
A process for the production of an inversely operated transistor in a semiconductor body on the surface of which are formed in spaced arrangement, collector region, then a base region and an emitter region wherein said base region is doped by ion implantation in such a manner that minority charge carriers injected from the emitter region into the base region are accelerated in the direction towards the collector region as a result of an inner drift field in the base region, wherein the ion implantation of the base zone is accomplished in several different steps, and wherein the base zone is doped with a doping concentration of approximately 10 17 /cm 3 , in the vicinity of the emitter zone, and the base zone has dimensions between 0.5 um and 0.05 um, and wherein implantation energy levels of 200 keV, 100 keV and 50 keV are used for the ion implantation.
Claim 4
Dependent Claim
151 words
A process for the production of an inversely operated transistor in a semiconductor body on the surface of which are formed in spaced arrangement, collector region, then a base region and an emitter region wherein said base region is doped by ion implantation in such a manner that minority charge carriers injected from the emitter region into the base region are accelerated in the direction towards the collector region as a result of an inner drift field in the base region, wherein the ion implantation of the base zone is accomplished in several different steps, and wherein the base zone is doped with a doping concentration of approximately 10 17 /cm 3 , in the vicinity of the emitter zone, and the base zone has dimensions between 0.5 um and 0.05 um, and wherein implantation energy levels of 200 keV, 100 keV and 50 keV are used for the ion implantation.
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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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |