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Au-coated Ag alloy bonding wires with enhanced oxidation resistance for electronic packaging applications

Yuchen Xiao (Chongqing Materials Research Institute Co Ltd, Chongqing, China and National Engineering Research Center for Instrument Functional Materials, Chongqing, China)
Huiyi Tang (Chongqing Materials Research Institute Co Ltd, Chongqing, China and National Engineering Research Center for Instrument Functional Materials, Chongqing, China)
Hehe Zhang (School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, China)
Xiaoling Yang (School of Materials Science and Engineering, Chongqing University, Chongqing, China)
Ling Sun (Chongqing Materials Research Institute Co Ltd, Chongqing, China and National Engineering Research Center for Instrument Functional Materials, Chongqing, China)
Yong Xie (Chongqing Materials Research Institute Co Ltd, Chongqing, China and National Engineering Research Center for Instrument Functional Materials, Chongqing, China)
Baoan Wu (Chongqing Materials Research Institute Co Ltd, Chongqing, China and National Engineering Research Center for Instrument Functional Materials, Chongqing, China)
Baifeng Luan (School of Materials Science and Engineering, Chongqing University, Chongqing, China)
Weidong Xie (School of Materials Science and Engineering, Chongqing University, Chongqing, China)
Xinnan Cai (Chongqing Materials Research Institute Co Ltd, Chongqing, China)

Microelectronics International

ISSN: 1356-5362

Article publication date: 21 September 2022

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Abstract

Purpose

The purpose of this paper is to develop high-performance Au-coated Ag alloy wires (ACAA wires) and demonstrate the effect of Au coating layers on the bonding performance and oxidation resistance for stable and reliable electronic packaging applications.

Design/methodology/approach

ACAA wire with a diameter of approximately 25 µm and Au layer thickness of approximately 100 nm were prepared by the continuous casting, plating and wire drawing method. The bonding performance of the ACAA wires were studied through bonding on 3,535 chips. The oxidation resistance of ACAA wires and Ag alloy wires (AA wires) were comparatively studied by means of chemical oxidation tests, accelerated life tests and electrochemical tests systematically.

Findings

ACAA wires could form axi-symmetrical spherical free air balls with controllable diameter of 1.5∼2.5 times of the wire diameter after electric flame-off process. The ball shear strength of ACAA wire was higher than that of AA wires. Most importantly, because of the surface Au coating layer, the oxidation resistance of ACAA wires was much enhanced.

Research limitations/implications

ACAA wires with different lengths of heat affected zone were not developed in this study, which limited their application with different loop height requirements.

Practical implications

With higher bonding strength and oxidation resistance, ACAA wires would be a better choice than previous reported AA wire in chip packaging which require high stability and reliability.

Originality/value

This paper provides a kind of novel ACAA wire, which possess the merits of high bonding strength and reliability, and show great potential in electronic packaging applications.

Keywords

Acknowledgements

This work was financially supported by the Natural Science Foundation Postdoctoral Science Foundation of Chongqing (cstc2020jcyj-bshX0087) and Special Key Projects of Technological Innovation and Application Development of Chongqing (cstc2019jscx-mbdxX0009).

Citation

Xiao, Y., Tang, H., Zhang, H., Yang, X., Sun, L., Xie, Y., Wu, B., Luan, B., Xie, W. and Cai, X. (2022), "Au-coated Ag alloy bonding wires with enhanced oxidation resistance for electronic packaging applications", Microelectronics International, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/MI-08-2022-0158

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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