Wiring structure to minimize stress induced void formation
First Claim
1. A wiring structure connecting a metal feature having a length, width, and thickness to a via, comprising:
- a single conducting layer comprising plurality of “
n”
overlapping segments each comprised of two ends and having a width, a length, and a thickness wherein one end of a first segment is connected to the metal feature and one end of the nth segment is connected to the via and wherein an end of a segment and an end of an adjacent segment form a bend at an angle θ and
a plurality of segments form at least one bending portion, and wherein the width of each of the plurality of segments forming the at least one bending portion is less than the width of the first segment.
1 Assignment
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Accused Products
Abstract
A wiring structure with improved resistance to void formation and a method of making the same are described. The wiring structure has a first conducting layer that includes a large area portion which is connected to an end of a protrusion with a plurality of “n” overlapping segments and at least one bending portion. The other end of the protrusion is connected to the bottom of a via which has an overlying second conducting layer. A bend is formed by overlapping the ends of two adjacent segments at an angle between 45° and 135°. The protrusion may also include at least one extension at a segment end beyond a bend. A bending portion and extension are used as bottlenecks to delay the diffusion of a vacancy from the large area portion to the vicinity of the via and is especially effective for copper interconnects or in a via test structure.
28 Citations
38 Claims
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1. A wiring structure connecting a metal feature having a length, width, and thickness to a via, comprising:
a single conducting layer comprising plurality of “
n”
overlapping segments each comprised of two ends and having a width, a length, and a thickness wherein one end of a first segment is connected to the metal feature and one end of the nth segment is connected to the via and wherein an end of a segment and an end of an adjacent segment form a bend at an angle θ and
a plurality of segments form at least one bending portion, and wherein the width of each of the plurality of segments forming the at least one bending portion is less than the width of the first segment.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An interconnect, comprising:
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(a) a first conducting layer including a large area portion having a first width, a first length, and a first thickness, the first conducting layer further including elongated protrusion having a second width and length, first thickness, and two ends, wherein one end is connected to the large area portion and the other end is connected to a via and said protrusion is comprised of at least one bending portion, and wherein the protrusion has a substantially uniform width throughout its length and extends over the via; (b) the via being connected at a first end to the protrusion in the first conducting layer and at a second end to a second conducting; and (c) the at least one bending portion comprising two or more intersecting subportions, wherein at least one extension extends beyond an intersection of said two or more intersection subportions. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A wiring structure connecting a metal feature having a length, width, and thickness to a via, comprising:
a single conducting layer comprising plurality of “
n”
overlapping segments each comprised of two ends and having a width, a length, and a thickness wherein one end of a first segment is connected to the metal feature and one end of the nth segment is connected to the via and wherein an end of a segment and an end of an adjacent segment form a bend at an angle θ and
a plurality of segments form at least one bending portion, the at least one bending portion comprising two or more intersecting subsegments, wherein at least one extension extends beyond an intersection of said two or more intersection subsegments and wherein the width of each of the plurality of segments forming the at least one bending portion is less than the width of the first segment.- View Dependent Claims (22, 23, 24, 25, 26)
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27. An interconnect, comprising:
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(a) a first conducting layer including a large area portion having a first width, a first length, and a first thickness, the first conducting layer further including an elongated protrusion having a second width and length, first thickness, and two ends, wherein one end is connected to the large area portion and the other end is connected to a via and said protrusion is comprised of at least one bending portion that includes a plurality of segments in which an end of one segment and an end of an adjacent segment overlap to form a bend at an angle θ
, and wherein a third width of each of the plurality of segments making up the at least one bending portion is less than the second width and wherein the protrusion extends over the via; and(b) the via being connected at a first end to the protrusion in the first conducting layer and at a second end to a second conducting. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification