Die assembly having electrical interconnect
View Patent ↗The present invention provides an apparatus for vertically interconnecting semiconductor die, integrated circuit die, or multiple die segments. Metal rerouting interconnects which extend to one or more sides of the die or segment can be optionally added to the die or multi die segment to provide edge bonding pads upon the surface of the die for external electrical connection points. After the metal rerouting interconnect has been added to the die on the wafer, the wafer is optionally thinned and each die or multiple die segment is singulated from the wafer by cutting or other appropriate singulation method. After the die or multiple die segments are singulated or cut from the wafer, insulation is applied to all surfaces of the die or multiple die segments, openings are made in the insulation above the desired electrical connection pads, and the die or multiple die segments are placed on top of one another to form a stack. Vertically adjacent segments in the stack are electrically interconnected by attaching a short flexible bond wire or bond ribbon to the exposed electrical connection pad at the peripheral edges of the die which protrudes horizontally from the die and applying electrically conductive polymer, or epoxy, filaments or lines to one or more sides of the stack.
1. A semiconductor die assembly, comprising an unencapsulated die having peripheral electrical connection sites and comprising a plurality of electrically conductive polymer elements electrically connected to a plurality of said peripheral electrical connection sites, wherein the electrically conductive polymer element is electrically connected to the electrical connection site by way of a conducting element electrically connected to the connection site on the die and extending away from the die into the electrically conductive polymer element.
2. The assembly of claim 1 , comprising at least two said die, wherein an interconnection site on a first one of said die is electrically connected to an interconnection site on a second one of said die by an electrically conductive polymer element.
3. The assembly of claim 1 , wherein the peripheral interconnection sites include original peripheral die pads.
4. The assembly of claim 1 , wherein said die is rerouted to connect original die pads to peripheral interconnection sites.
5. The assembly of claim 2 , wherein the peripheral interconnection sites on at least one of said die include original peripheral die pads.
6. The assembly of claim 2 , wherein at least one of said die is rerouted to connect original die pads to peripheral interconnection sites.
7. The assembly of claim 1 , further comprising an electrical insulator situated at least between the die and the electrically conductive polymer element.
8. The assembly of claim 7 , wherein the electrical insulator comprises a conformal coating.
9. The assembly of claim 8 , wherein the conformal coating has openings above selected ones of the interconnection sites.
10. The assembly of claim 8 , wherein the conformal coating comprises a polymer.
11. The assembly of claim 10 , wherein the conformal coating comprises parylene.
12. The assembly of claim 2 , further comprising an electrical insulator between at least one said die and the electrically conductive polymer element.
13. The assembly of claim 12 , wherein the electrical insulator comprises a conformal coating.
14. The assembly of claim 13 , wherein wherein the insulating coating has openings above selected ones of the interconnection sites.
15. The assembly of claim 13 , wherein wherein the conformal coating comprises a polymer.
16. The assembly of claim 15 , wherein wherein the conformal coating comprises parylene.
17. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a filament.
18. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a line.
19. The assembly of claim 1 , wherein the electrically conductive polymer element is oriented generally perpendicular to the die mount side of the substrate a surface of said die.
20. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a conductive epoxy.
21. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a filled epoxy.
22. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a silver filled epoxy.
23. The assembly of claim 1 , wherein the electrically conductive polymer element comprises a gold filled epoxy.
24. The assembly of claim 1 , wherein the conducting element comprises a bond wire.
25. The assembly of claim 1 , wherein the conducting element comprises a bond ribbon.
26. The assembly of claim 1 , wherein the conducting element comprises a metal.
27. The assembly of claim 1 , wherein the conducting element comprises one of gold, aluminum, copper and palladium, and a combination thereof.
28. The assembly of claim 1 , wherein at least one of said die is a memory die.
29. The assembly of claim 1 , wherein the electrically conductive polymer element extends beyond at least one surface of a die in the assembly.
30. A semiconductor die assembly, comprising uncapsulated die stacked one over another, each said die having peripheral electrical connection sites, the assembly further comprising an electrically conductive polymer element electrically connected to at least one said electrical connection site by way of a conducting element electrically connected to the connection site on the die and extending away from the die into the electrically conductive polymer element.
31. The assembly of claim 30 , wherein said conductive polymer element is electrically connected to fewer than all of said die.
32. The assembly of claim 30 , wherein said conductive polymer element is electically connected to fewer than all of said die.
33. The assembly of claim 30 , wherein adjacent die in the stack are laminated one to another using an electrically insulating material.
34. The assembly of claim 33 , wherein the electrically insulating material comprises a thermally conductive material.
35. The assembly of claim 33 , wherein the electrically insulating material comprises a polymer.
36. The assembly of claim 33 , wherein the electrically insulating material comprises an epoxy.
37. The assembly of claim 33 , wherein the electrically insulating material comprises an epoxy preform.
38. The assembly of claim 33 , wherein the electrically insulating material comprises a portion of a conformal die coating.
39. The assembly of claim 38 , wherein the conformal die coating comprises parylene.
40. The assembly of claim 33 , wherein the electrically insulating material includes spacers.
41. The assembly of claim 33 , wherein the electrically insulating material includes spherical spacers.
42. The assembly of claim 40 , wherein the spacers comprise one of: glass, ceramic, plastic, Teflon, a polymer, quartz, and combinations thereof.
43. The assembly of claim 35 , wherein the electrically insulating material further comprises spacers.
44. The assembly of claim 43 , wherein the spacers comprise spheres.
45. The assembly of claim 43 , wherein the spacers comprise one of: glass, ceramic, plastic, Teflon, a polymer, quartz, and combinations thereof.
46. The assembly of claim 34 , wherein the electrically insulating material further comprises spacers.
47. The assembly of claim 46 , wherein the spacers comprise spheres.
48. The assembly of claim 47 , wherein the spacers comprise one of: glass, ceramic, plastic, Teflon, a polymer, quartz, and combinations thereof.
49. The assembly of claim 37 , wherein the epoxy preform comprises spacers.
50. The assembly of claim 49 , wherein the spacers comprise spheres.
51. The assembly of claim 50 , wherein the spacers comprise one of: glass, ceramic, plastic, Teflon, a polymer, quartz, and combinations thereof.
52. The assembly of claim 30 , wherein at least one said die is oriented such that the active side of the die faces away from a first said die.
53. The assembly of claim 30 , wherein at least one said die is oriented such that the active side of the die faces toward a first said die.
54. The assembly of claim 30 , wherein the active side of at least two said die face in the same direction.