Microfeature workpieces and methods for forming interconnects in microfeature workpieces
First Claim
1. A microfeature workpiece, comprising:
- a substrate;
a dielectric layer on the substrate;
a microelectronic die formed in and/or on the substrate, the die including a terminal on the dielectric layer and an integrated circuit operably coupled to the terminal; and
a hole extending through the terminal and the dielectric layer to at least an intermediate depth in the substrate, the hole having a first lateral dimension in the dielectric layer and a second lateral dimension in the substrate at an interface between the dielectric layer and the substrate, the second lateral dimension being greater than the first lateral dimension, and wherein the hole has a third lateral dimension in a portion of the substrate spaced apart from the interface between the dielectric layer and the substrate, the third lateral dimension being less than the second lateral dimension.
7 Assignments
0 Petitions
Accused Products
Abstract
Methods for forming interconnects in microfeature workpieces, and microfeature workpieces having such interconnects are disclosed herein. In one embodiment, a method of forming an interconnect in a microfeature workpiece includes forming a hole extending through a terminal and a dielectric layer to at least an intermediate depth in a substrate of a workpiece. The hole has a first lateral dimension in the dielectric layer and a second lateral dimension in the substrate proximate to an interface between the dielectric layer and the substrate. The second lateral dimension is greater than the first lateral dimension. The method further includes constructing an electrically conductive interconnect in at least a portion of the hole and in electrical contact with the terminal.
583 Citations
24 Claims
-
1. A microfeature workpiece, comprising:
-
a substrate; a dielectric layer on the substrate; a microelectronic die formed in and/or on the substrate, the die including a terminal on the dielectric layer and an integrated circuit operably coupled to the terminal; and a hole extending through the terminal and the dielectric layer to at least an intermediate depth in the substrate, the hole having a first lateral dimension in the dielectric layer and a second lateral dimension in the substrate at an interface between the dielectric layer and the substrate, the second lateral dimension being greater than the first lateral dimension, and wherein the hole has a third lateral dimension in a portion of the substrate spaced apart from the interface between the dielectric layer and the substrate, the third lateral dimension being less than the second lateral dimension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A microfeature workpiece, comprising:
-
a substrate having a substrate surface; a dielectric layer on the substrate surface; a terminal on the dielectric layer; an operable microelectronic feature carried by the substrate and operably coupled to the terminal; and an interconnect via extending through the terminal and the dielectric layer to at least an intermediate depth in the substrate, the interconnect via including an undercut portion in the substrate proximate an interface between the dielectric layer and the substrate, the undercut portion being at a first depth from the substrate surface and having a first diameter, wherein the interconnect via also includes a hole portion proximate the undercut portion and extending into the substrate, the hole portion being at a second depth greater than the first depth, and wherein the hole portion has a second diameter smaller than the first diameter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A microfeature workpiece, comprising:
-
a substrate; a dielectric layer on the substrate; a semiconductor die formed in and/or on the substrate, the semiconductor die including a terminal on the dielectric layer and an integrated circuit operably coupled to the terminal; an aperture extending through the terminal and the dielectric layer into the substrate, the aperture having a first lateral dimension in the dielectric layer and a second lateral dimension in the substrate at an interface between the dielectric layer and the substrate, the second lateral dimension being greater than the first lateral dimension, and wherein the aperture has a third lateral dimension in a portion of the substrate spaced apart from the interface between the dielectric layer and the substrate, the third lateral dimension being less than the second lateral dimension; and a conductive fill material substantially filling the aperture and in contact with the terminal. - View Dependent Claims (22, 23, 24)
-
Specification