Investigation of Cu/In thermosonic bonding

Yan Pin Huang, Shu Lin Lu, Yu Shang Huang, Yi Hsiu Tseng, Min Fong Shu, Kuan-Neng Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In response to the current trend of multi-functional electronic products, integrated circuits become smaller with higher I/O counts. Thermosonic bonding is a potential microelectronic stacking technology for three-dimensional (3D) integration and advanced packaging. Therefore, it is important to comprehend the relation between strength and bonding condition. In this paper, parameters of ultrasonic vibration for low temperature Cu pillar to Cu/In bonding are investigated through shear test. Moreover, electrical performance is evaluated by Kelvin structure and Daisy chain. Experiment results show that heating temperature and bonding force possess a positive correlation with shear strength, which can be up to 39 MPa. In addition, it exhibits good electrical performance in the range of 10−8 Ω-cm2 as well as high resistance to environmental degradation. This work provides guidelines of Cu/In thermosonic bonding for future fine pitch applications.

Original languageEnglish
Pages (from-to)8890-8893
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number12
StatePublished - 1 Jan 2017


  • Shear strength
  • Thermonsic bonding
  • Three dimensional integration

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