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Via resistance reduction in Cu interconnects was achieved through a pre-liner dielectric nitridation process prior to pure Ta liner deposition. Replacing TaN with Ta in the conventional liner stack reduces Cu via resistance, while the nitridation treatment maintains the interconnect integrity and reliability. Comprehensive evaluations including adhesion tests, parametric measurements, and electromigration...
Adhesion tests, parametric measurements, and reliability evaluations of an in-situ pre-liner dielectric nitridation process prior to pure Ta liner deposition were carried out, to evaluate the feasibility of reducing via resistance in BEOL Cu/low-k interconnects. Replacing TaN/Ta with Ta in the conventional liner stack reduces Cu via resistance, while the nitridation treatment maintains Cu interconnect...
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