Microelectronic connections with liquid conductive elements
First Claim
1. A method of making a microelectronic assembly comprising the steps of:
- (a) providing a first microelectronic element and a second microelectronic element with confronting, spaced-apart surfaces defining a space therebetween;
(b) providing one or more masses of a fusible conductive material having a melting temperature below about 65°
C. in said space;
then (c) introducing a flowable material between the confronting surfaces of said first and second microelectronic elements and around said one or more conductive masses; and
(d) curing said flowable material to form a compliant layer disposed between said confronting surfaces and intimately surrounding each said conductive mass.
3 Assignments
0 Petitions
Accused Products
Abstract
A method of making a microelectronic assembly includes providing a first microelectronic element and a second microelectronic element with confronting, spaced-apart surfaces defining a space therebetween and providing one or more masses of a fusible conductive material having a melting temperature below about 150° C. in said space, whereby the fusible conductive masses connect the first and second microelectronic elements to one another. Next, a flowable material is introduced between the confronting surfaces of the first and second microelectronic elements and around the one or more fusible conductive masses and the flowable material is then cured to provide a compliant layer disposed between said confronting surfaces and intimately surrounding each fusible conductive mass. The fusible conductive masses are capable of electrically interconnecting the contacts on microelectronic elements confronting one another and/or conducting heat between confronting microelectronic elements.
106 Citations
70 Claims
-
1. A method of making a microelectronic assembly comprising the steps of:
-
(a) providing a first microelectronic element and a second microelectronic element with confronting, spaced-apart surfaces defining a space therebetween;
(b) providing one or more masses of a fusible conductive material having a melting temperature below about 65°
C. in said space;
then(c) introducing a flowable material between the confronting surfaces of said first and second microelectronic elements and around said one or more conductive masses; and
(d) curing said flowable material to form a compliant layer disposed between said confronting surfaces and intimately surrounding each said conductive mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
providing a third microelectronic element confronting said rear surface so that said first microelectronic element and said third microelectronic element define a rear space between said rear surface and said third microelectronic element;
disposing one or more fusible conductive masses having a melting temperature below about 150°
C. in said rear space; and
introducing a flowable material into said rear space and around said conductive masses in said rear space.
-
-
22. A method as claimed in claim 21, further comprising the step of curing said flowable material in said rear space to form a rear compliant layer between said third microelectronic element and said first microelectronic element, said rear compliant layer intimately surrounding said conductive masses in said rear space.
-
23. A method as claimed in claim 22 wherein said step of introducing said flowable material into said rear space and said step of introducing said flowable material between the confronting surfaces of said first and second microelectronic elements are preformed by introducing simultaneously using a single flowable material.
-
24. A method as claimed in claim 22 wherein said first microelectronic element includes a semiconductor chip, said second microelectronic element includes a circuit panel, and said third microelectronic element includes a thermally conductive element.
-
25. A method as claimed in claim 21 further comprising the step of moving said second and third microelectronic elements toward one another while said masses in said front and rear spaces are in a molten condition to thereby compress material in said front and rear spaces.
-
26. A method as claimed in claim 25 wherein said second microelectronic element is a flexible dielectric sheet having an exterior surface facing away from said first microelectronic element, said second microelectronic element including conductive terminals accessible at said exterior surface, the method further including the step of electrically connecting said terminals to said first microelectronic element.
-
27. A method as claimed in claim 1, wherein said fusible conductive material has a melting temperature below about 125°
- C.
-
28. A method as claimed in claim 1, wherein said fusible conductive material has a melting temperature below about 65°
- C.
-
29. A method as claimed in claim 1, wherein said fusible conductive material has a melting temperature between about 25°
- C. and about 65°
C.
- C. and about 65°
-
30. A method as claimed in claim 1, wherein said fusible conductive material includes a metal.
-
31. A method as claimed in claim 1, wherein said fusible conductive material includes a metal alloy.
-
32. A method as claimed in claim 1, further comprising the step of applying a polymer coating to said one or masses of said fusible conductive material before the introducing a flowable material step.
-
33. A method as claimed in claim 32, wherein said polymer coating includes polyparaxylene.
-
34. A method of making a microelectronic assembly comprising the steps of:
-
(a) juxtaposing in spaced apart relationship a microelectronic first element with a second element having electrically conductive areas;
(b) providing one or more masses of a fusible conductive material extending between said first and second elements, said fusible conductive material having a melting temperature below about 65°
C.;
(c) introducing a flowable material between said first and second elements; and
(d) curing said flowable material to form a compliant layer disposed between said first and second elements and intimately surrounding said fusible conductive masses. - View Dependent Claims (35, 36, 37, 38)
-
-
39. A method of making a microelectronic assembly comprising the steps of:
-
(a) providing a first microelectronic element and a second microelectronic element with confronting, spaced-apart surfaces defining a space therebetween;
(b) providing one or more masses of a fusible conductive material having a melting temperature below about 150°
C. in said space;
then(c) introducing a flowable material between the confronting surfaces of said first and second microelectronic elements and around said one or more conductive masses; and
(d) curing said flowable material to form a compliant layer disposed between said confronting surfaces and intimately surrounding each said conductive mass, wherein said one or more fusible conductive masses are maintained in a substantially liquid condition during said step of introducing a flowable material. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
providing a third microelectronic element confronting said rear surface so that said first microelectronic element and said third microelectronic element define a rear space between said rear surface and said third microelectronic element;
disposing one or more fusible conductive masses having a melting temperature below about 150°
C. in said rear space; and
introducing a flowable material into said rear space and around said conductive masses in said rear space.
-
-
57. A method as claimed in claim 56, further comprising the step of curing said flowable material in said rear space to form a rear compliant layer between said third microelectronic element and said first microelectronic element, said rear compliant layer intimately surrounding said conductive masses in said rear space.
-
58. A method as claimed in claim 57, wherein said step of introducing said flowable material into said rear space and said step of introducing said flowable material between the confronting surfaces of said first and second microelectronic elements are preformed by introducing simultaneously using a single flowable material.
-
59. A method as claimed in claim 57, wherein said first microelectronic element includes a semiconductor chip, said second microelectronic element includes a panel, and said third microelectronic element includes a thermally conductive element.
-
60. A method as claimed in claim 56, further comprising the step of moving said second and third microelectronic elements toward one another while said masses in said front and rear spaces are in a molten condition to thereby compress material in said front and rear spaces.
-
61. A method as claimed in claim 60, wherein said second microelectronic element is a flexible dielectric sheet having an exterior surface facing away from said first microelectronic element, said second microelectronic element including conductive terminals accessible at said exterior surface, the method further including the step of electrically connecting said terminals to said first microelectronic element.
-
62. A method as claimed in claim 39, wherein said fusible conductive material has a melting temperature between about 25°
- C. and about 65°
C.
- C. and about 65°
-
63. A method as claimed in claim 39, wherein said fusible conductive material includes a metal.
-
64. A method as claimed in claim 39, further comprising the step of applying a polymer coating to said one or masses of said fusible conductive material before the introducing a flowable step.
-
65. A method of making a microelectronic assembly comprising the steps of:
-
(a) juxtaposing in spaced apart relationship a microelectronic first element with a second element having electrically conductive areas;
(b) providing one or more masses of a fusible conductive material extending between said first and second elements;
(c) introducing a flowable material between said first and second elements; and
(d) curing said flowable material to form a compliant layer disposed between said first and second elements and intimately surrounding said fusible conductive masses, wherein said one or more fusible conductive masses are maintained in a substantially liquid condition during said step of introducing a flowable material. - View Dependent Claims (66, 67, 68, 69, 70)
-
Specification