Abstract

By dual hard mask (dHM) process combined with sidewall-hardening etching step, copper dual-damascene (DD) interconnects are fabricated in low-k organic film without any etch-stop layers under the trench. Careful designs of dHM structures and their patterning sequence enable us to harden the via-sidewall by fluorocarbon plasma, which is a key to reduce final via-shoulder loss at the via/trench connecting region. The low-k structure has low via resistance such as 0.65 /spl Omega//0.28 /spl mu/m/sup /spl phi//-via while keeping the large tolerance of misalignment in via/trench, appreciable for 0.1 /spl mu/m-generation CMOS ULSIs.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.