Unified test structure for stress migration tests
First Claim
1. A test structure comprising a current path chain having a first half chain and a second half chain, wherein:
- each half chain comprises lower metallization segments, upper metallization segments, an insulating layer between the lower metallization segments and the upper metallization segments, and connection segments;
each of said connection segments is electrically connected to a contact region of one of said lower metallization segments and to a contact region of one of said upper metallization segments to thereby electrically connect the respective lower metallization segment and the respective upper metallization segment;
at least one of the first half chain or the second half chain comprises a width less than a width of a probe pad; and
the first half chain and the second half chain have different configurations with different structural electrical characteristics, wherein the upper and lower metallization segments of the first half chain are different with respect to the upper and lower metallization segments of the second half chain.
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Abstract
A unified test structure which is applicable for all levels of a semiconductor device including a current path chain having a first half chain and a second half chain, wherein each half chain comprises lower metallization segments, upper metallization segments, an insulating layer between the lower metallization segments and the upper metallization segments, and connection segments. Each of the connection segments is electrically connected to a contact region of one of the lower metallization segments and to a contact region of one of the upper metallization segments to thereby electrically connect the respective lower metallization segment and the respective upper metallization segment, and the first half chain and the second half chain are of different configuration.
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Citations
19 Claims
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1. A test structure comprising a current path chain having a first half chain and a second half chain, wherein:
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each half chain comprises lower metallization segments, upper metallization segments, an insulating layer between the lower metallization segments and the upper metallization segments, and connection segments; each of said connection segments is electrically connected to a contact region of one of said lower metallization segments and to a contact region of one of said upper metallization segments to thereby electrically connect the respective lower metallization segment and the respective upper metallization segment; at least one of the first half chain or the second half chain comprises a width less than a width of a probe pad; and the first half chain and the second half chain have different configurations with different structural electrical characteristics, wherein the upper and lower metallization segments of the first half chain are different with respect to the upper and lower metallization segments of the second half chain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A test structure comprising a first current path chain having a first half chain and a second half chain, wherein:
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each half chain comprises lower metallization segments, upper metallization segments, an insulating layer between the lower metallization segments and the upper metallization segments, and connection segments; each of said connection segments is electrically connected to a contact region of one of said lower metallization segments and to a contact region of one of said upper metallization segments to thereby electrically connect the respective lower metallization segment and the respective upper metallization segment; at least one of the first half chain or the second half chain comprises a width less than a width of a probe pad; the first half chain and the second half chain have different configurations; and further comprising at least a second current path chain having a first half chain and a second half chain, wherein one of said half chains of the first current path chain is connected to a first probe pad and the other half chain of said first current path chain is connected to a second probe pad, and one half chain of the second current path chain is connected to the second probe pad, and wherein the first current path chain spans a width that is equal to a width of the first probe pad and the second current path chain spans a width that is equal to a width of the second probe pad.
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Specification