A multilevel metal interconnect with air-gap has been developed to reduce RC delay time for quick turn-around-time foundry manufacturing. The air-gap method has been successfully applied to 0.25 μm foundry technology. Measurements on ring oscillators confirm that the smallest delay time is indeed achieved with the air-gap method, compared with that using either conventional high-density-plasma (HDP) oxide or low-dielectric-constant spin-on-glass (SOG). In addition, we have also developed fitting equations for the delay time, thus provide a handy method for predicting the RC delay time. The oscillator delay time is also found to be critically dependent on not only the size, but also the position of the air-gap. Best delay time reduction is obtained when the air-gap is positioned in extended both above and below the metal lines to effectively reduce the fringing capacitance.
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - 1 Dec 2000|
|Event||Materials, Technology and Reliability for Advanced Interconnetcs and Low-K Dielectrics - San Francisco, CA, United States|
Duration: 23 Apr 2000 → 27 Apr 2000