Optimized ultra-thin manganin alloy passivated fine-pitch damascene compatible bump-less Cu–Cu bonding at sub 200 °C for three-dimensional Integration applications

Panigrahi, Asisa Kumar and Kumar, C Hemanth and Vanjari, Siva Rama Krishna and Singh, Shiv Govind Et. al (2017) Optimized ultra-thin manganin alloy passivated fine-pitch damascene compatible bump-less Cu–Cu bonding at sub 200 °C for three-dimensional Integration applications. Japanese Journal of Applied Physics, 57 (2S1). 02BC04. ISSN 0021-4922

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Abstract

Enhanced Cu diffusion, Cu surface passivation, and smooth surface at the bonding interface are the key essentials for high quality Cu–Cu bonding. Previously, we have demonstrated optimized 3 nm thin Manganin metal-alloy passivation from oxidation and also helps to reduce the surface roughness to about 0.8 nm which substantially led to high quality Cu–Cu bonding. In this paper, we demonstrated an ultra fine-pitch (<25 µm) Cu–Cu bonding using an optimized Manganin metal-alloy passivation. This engineered surface passivation approach led to high quality bonding at sub 200 °C temperature and 0.4 MPa. Very low specific contact resistance of 1.4 × 10−7 Ω cm2 and the defect free bonded interface is clear indication of high quality bonding for future multilayer integrations. Furthermore, electrical characterization of the bonded structure was performed under various robust conditions as per International Technology Roadmap for Semiconductors (ITRS Roadmap) in order to satisfy the stability of the bonded structure.

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IITH Creators:
IITH CreatorsORCiD
Vanjari, Siva Rama KrishnaUNSPECIFIED
Singh, Shiv Govindhttp://orcid.org/0000-0001-7319-879X
Item Type: Article
Subjects: Electrical Engineering
Divisions: Department of Engineering Science
Depositing User: Team Library
Date Deposited: 09 May 2019 09:12
Last Modified: 09 May 2019 09:12
URI: http://raiith.iith.ac.in/id/eprint/5099
Publisher URL: http://doi.org/10.7567/JJAP.57.02BC04
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