Test structure and related methods for evaluating stress-induced voiding
First Claim
1. A test structure formed within a semiconductor wafer, comprising:
- a plurality of first level bulk metal features having varying sizes, wherein adjacent features are coupled to second level thin conductors connected to vias located therebetween;
a plurality of second level bulk metal features having varying sizes, wherein adjacent features are coupled to first level thin conductors connected to vias located therebetween;
a first level contact pad coupled to a smallest of the plurality of second level bulk metal features; and
a second level contact pad coupled to a largest of the plurality of first level bulk metal features, a largest of the second level bulk metals coupled to a smallest of the first level bulk metals.
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Abstract
This disclosure provides, in one aspect, a test structure formed within a semiconductor wafer. In one embodiment, the test structure comprises a plurality of first level bulk metals having varying sizes, where adjacent ones of the plurality of first level bulk metals are coupled together using vias connected to second level thin conductors located therebetween. In addition, the test structure comprises a plurality of second level bulk metals having varying sizes, where adjacent ones of the plurality of second level bulk metals are coupled together using vias connected to first level thin conductors located therebetween. Furthermore, the test structure includes a first level contact pad coupled to a smallest of the plurality of second level bulk metals, and a second level contact pad coupled to a largest of the plurality of first level bulk metals. In such an embodiment, a largest of the second level bulk metals coupled to a smallest of the first level bulk metals. In other aspects, this disclosure provides a method of manufacturing a test structure within a semiconductor wafer, and a method of evaluating stress-induced voiding of metals within a semiconductor wafer.
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Citations
7 Claims
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1. A test structure formed within a semiconductor wafer, comprising:
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a plurality of first level bulk metal features having varying sizes, wherein adjacent features are coupled to second level thin conductors connected to vias located therebetween;
a plurality of second level bulk metal features having varying sizes, wherein adjacent features are coupled to first level thin conductors connected to vias located therebetween;
a first level contact pad coupled to a smallest of the plurality of second level bulk metal features; and
a second level contact pad coupled to a largest of the plurality of first level bulk metal features, a largest of the second level bulk metals coupled to a smallest of the first level bulk metals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification