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A novel test structure based on a planar capacitor design has been used for advanced barrier material evaluation and process optimization. This structure enables intrinsic reliability study of Cu/low-k interconnects. Various barrier materials such as CuMn self-forming barrier, ALD Ru, and PVD TaNTa on different dielectric films have been investigated to understand their intrinsic limits of barrier...
A novel test structure to study intrinsic reliability of barrier/low-k is proposed. The structure is based on a planar capacitor design where low-k film is deposited after the patterning of the capacitor, followed by metallization and Cu CMP. This so called low-k planar capacitor structure provides several unique capabilities to study various aspects of barrier/low-k TDDB compared with the conventional...
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