Abstract

The electroless (EL) Ni layer conformally formed inside the high aspect ratio (AR, >10) through-Si-via (TSV) has been investigated for its role as seed layer in bottom-up Cu electroplating. From the electro-chemical adsorption monitoring data it was found that the adsorption (or accumulation) of additives onto the EL-Ni surface for bottom-up Cu electroplating was prodoundly suppressed when compared with the Ni seed layer depositied by PVD. A simple and viable two step process was proposed and demonstrated to overcome the problem, and we were able to successfully fill the TSVs (width ~10 mm, AR > 10) with by Cu-electroplating using the EL- Ni as seed as well as barrier layer. Thus, this low-cost, readily-scalable (both in wafer-size and volume) and CMOS compatible EL method for the formation of Ni barrier-cum-seed layer in the high AR TSVs for integration and packaging applications has tremendous potential to replace the high-cost PVD or CVD barrier and seed layers..

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.