A novel sub-half micron Al-Cu via plug interconnect using low dielectric constant material as inter-level dielectric
- 1 February 1997
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Electron Device Letters
- Vol. 18 (2) , 57-59
- https://doi.org/10.1109/55.553043
Abstract
A novel Al-Cu via plug interconnect using low dielectric constant (low-/spl epsiv/) material as inter-level dielectric (ILD) has been demonstrated. The interconnect structure was fabricated by spin-on deposition of the low-/spl epsiv/ ILD and physical vapor deposition (PVD) of the Al-Cu. Excellent local ILD planarization was achieved by a two-step spin-on coating process. The dielectric constant of the low-/spl epsiv/ no is about 2.7, which leads to significant interconnect wiring capacitance reduction. For the first time, completely filled Al-Cu:0.5% plugs with nearly vertical sidewalls were fabricated in organic low-/spl epsiv/ ILD. Excellent via fill was observed with via size down to 0.30 /spl mu/m. Low via resistance and excellent via reliability have been observed.Keywords
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