US4219448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screenable contact structure and method for semiconductor devices
Assignee: Individual
•
Filing: 1978-06-08
•
Granted: 1980-08-26
•
Expires: 1998-06-08
Abstract
Abstract An ink composition for deposition upon the surface of a semiconductor device to provide a contact area for connection to external circuitry is disclosed, the composition comprising an ink system containing a metal powder, a binder and vehicle, and a metal frit. The ink is screened onto the semiconductor surface in the desired pattern and is heated to a temperature sufficient to cause the metal frit to become liquid. The metal frit dissolves some of the metal powder and densifies the structure by transporting the dissolved metal powder in a liquid sintering process. The sintering process typically may be carried out in any type of atmosphere. A small amount of dopant or semiconductor material may be added to the ink systems to achieve particular results if desired.
Inventors
- 👤 Bernd Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:52
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/09; H; H10; H10F; H10F77/00; H10F77/20; H10F77/206; H10F77/211; H10P; H10P14/00; H10P14/40; H10P95/00; H10P95/50; H10W; H10W20/00; H10W20/40; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49206; Y10T29/49224
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
47 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable metal powder, a binder, a vehicle, and a metal frit for use as a liquid medium to transport the metal powder in a liquid sintering process and thereby create a coherent metal structure.
Claim 2
Dependent Claim
47 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable metal powder, a binder, a vehicle, and a metal frit for use as a liquid medium to transport the metal powder in a liquid sintering process and thereby create a coherent metal structure.
Claim 3
Dependent Claim
38 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable powder of a metal having an electrical resistivity of 7.0 ohm-cm or less at 0° C., a binder, a vehicle, and a metal frit.
Claim 4
Dependent Claim
38 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable powder of a metal having an electrical resistivity of 7.0 ohm-cm or less at 0° C., a binder, a vehicle, and a metal frit.
Claim 5
Dependent Claim
52 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable powder of a metal having an electrical resistivity of 7.0 ohm-cm or less at 0° C., a binder, a vehicle, and a metal frit having a melting point approximately in the range of 200° C. to 600° C.
Claim 6
Dependent Claim
52 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable powder of a metal having an electrical resistivity of 7.0 ohm-cm or less at 0° C., a binder, a vehicle, and a metal frit having a melting point approximately in the range of 200° C. to 600° C.
Claim 7
Dependent Claim
14 words
A composition according to claim 1, 2 or 3, further including a semiconductor powder.
Claim 8
Dependent Claim
24 words
A composition according to claim 1, 2 or 3, further including a dopant selected from the group consisting of N and P type dopants.
Claim 9
Dependent Claim
14 words
A composition according to claim 1, 2 or 3, further comprising a fluxing agent.
Claim 10
Dependent Claim
30 words
A composition according to claim 1, 2 or 3, wherein the amount of the metal frit is in the range of one to ten percent by weight of the composition.
Claim 11
Dependent Claim
31 words
A composition according to claim 1, 2, or 3, wherein the metal powder is selected from the group consisting of copper, nickel, aluminum, silver, and gold, and alloys and combinations thereof.
Claim 12
Dependent Claim
33 words
A composition according to claim 1, 2, or 3, wherein the metal frit is selected from the group consisting of lead, tin, zinc, cadmium, indium, bismuth, antimony, aluminum, and alloys and combinations thereof.
Claim 13
Dependent Claim
21 words
A composition according to claim 1, 2 or 3, further comprising a fluxing agent selected from the group consisting of fluorides.
Claim 14
Dependent Claim
78 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable metal powder selected from the group consisting of copper, nickel, aluminum, silver, gold, and combinations and alloys thereof, a binder, a vehicle, a metal frit selected from the group consisting of lead, tin, zinc, cadmium, indium, bismuth, antimony, aluminum, and combinations and alloys thereof, a semiconductor powder, a dopant selected from the group consisting of N and P type dopants, and a fluxing agent.
Claim 15
Dependent Claim
78 words
A metal powder composition for deposition and firing upon a substrate, comprising a screenable metal powder selected from the group consisting of copper, nickel, aluminum, silver, gold, and combinations and alloys thereof, a binder, a vehicle, a metal frit selected from the group consisting of lead, tin, zinc, cadmium, indium, bismuth, antimony, aluminum, and combinations and alloys thereof, a semiconductor powder, a dopant selected from the group consisting of N and P type dopants, and a fluxing agent.
Claim 16
Dependent Claim
18 words
A composition according to claim 11 wherein the fluxing agent is selected from the group consisting of fluorides.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |