US4689648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically sensitive metal semiconductor devices
Assignee: International Business Machines Corp
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Filing: 1986-05-27
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Granted: 1987-08-25
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Expires: 2006-05-27
Abstract
Abstract Metal junction contact diode and transistor configurations that exhibit high magnetic sensitivity are described. Implanted emitters that have a perimeter area giving rise to unwanted components of minority carrier injection are eliminated in the junction which is limited to a uniplanar contact. Metal semiconductor junctions formed on P-type silicon have been discovered to be superior injectors for minority carriers when hafnium, zirconium, or zinc metal are used to form a silicide layer that forms a reliable emitter. Extreme high frequency capability linear response exist for these devices. They are operative between 0 hertz and 10 gigahertz.
Inventors
- 👤 Albert W. Vinal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:00
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A magnetically sensitive metal semiconductor junction device, comprising: a uniplanar metal emitter junction on a semiconductive substrate; said emitter being supplied with electrical potential forward biasing said metal semiconductor junction into substantially uniplanar and unidirectional injection of minority carriers into said substrate; said junction having a finite area of contact with said substrate, said area having at least one dimension thereof lying perpendicular to the direction of magnetic fields to be sensed and perpendicular to the direction of injection of said minority carriers; at least one output contact on said substrate, at least half of said output contact being on one side of an imaginary plane constructed perpendicular to the surface of said emitter and passing through and bisecting said one dimension of said junction, said output having electrical potential supply connections to provide an electrical output signal in response to magnetic fields intercepting the substrate parallel to the surface of said emitter.
Claim 2
Dependent Claim
153 words
A magnetically sensitive metal semiconductor junction device, comprising: a uniplanar metal emitter junction on a semiconductive substrate; said emitter being supplied with electrical potential forward biasing said metal semiconductor junction into substantially uniplanar and unidirectional injection of minority carriers into said substrate; said junction having a finite area of contact with said substrate, said area having at least one dimension thereof lying perpendicular to the direction of magnetic fields to be sensed and perpendicular to the direction of injection of said minority carriers; at least one output contact on said substrate, at least half of said output contact being on one side of an imaginary plane constructed perpendicular to the surface of said emitter and passing through and bisecting said one dimension of said junction, said output having electrical potential supply connections to provide an electrical output signal in response to magnetic fields intercepting the substrate parallel to the surface of said emitter.
Claim 3
Dependent Claim
25 words
A magnetically sensitive device as described in claim 1, further comprising: at least two said output contacts located on opposite sides of said imaginary plane.
Claim 4
Dependent Claim
37 words
A magnetically sensitive device as described in claim 1 and further including: said substrate comprising a base of semiconductive material, and; at least one ohmic base contact supplied with electrical potential and forward biasing said emitter junction.
Claim 5
Dependent Claim
37 words
A magnetically sensitive device as described in claim 2 and further including: said substrate comprising a base of semiconductive material, and; at least one ohmic base contact supplied with electrical potential and forward biasing said emitter junction.
Claim 6
Dependent Claim
36 words
A magnetically sensitive device as described in claim 1 or claim 2 or claim 3 or claim 4 wherein: said metal-semiconductor junctions are formed with hafnium, zirconium or zinc metal on a silicon P-type semiconductive substrate.
Claim 7
Dependent Claim
37 words
A magnetically sensitive device as described in claim 1 or 2 or 3 or 4, wherein: said output contacts comprise rectifying junctions; said rectifying junctions being supplied with electrical potential reverse biasing them relative to said substrate.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |