Diffusion barrier integrity and electrical performance of Cu/porous dielectric damascene lines

One issue accompanying the introduction of porous dielectrics in Cu damascene interconnects is the integrity of diffusion barriers. For the first time a direct correlation is shown between the physical integrity of the barrier layer and the electrical performance of damascene lines embedded in a die...

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Veröffentlicht in:IEEE electron device letters 2003-03, Vol.24 (3), p.147-149
Hauptverfasser: Iacopi, F., Tokei, Zs, Stucchi, M., Lanckmans, F., Maex, K.
Format: Artikel
Sprache:eng
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Zusammenfassung:One issue accompanying the introduction of porous dielectrics in Cu damascene interconnects is the integrity of diffusion barriers. For the first time a direct correlation is shown between the physical integrity of the barrier layer and the electrical performance of damascene lines embedded in a dielectric with a k value of 2.0. The breakdown field at 100/spl deg/C for lines with a porous barrier layer is considerably lower than that for lines with an efficient sealing barrier. Irreversible degradation is also observed in the leakage current of structures with a porous barrier after thermal and electrical stress. Contamination of the porous dielectric can take place already during damascene processing, so the use of a barrier layer that can efficiently seal the pores after dielectric patterning is essential for a proper functioning of future interconnects.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2003.809535