Characterisation of Electrical-Thermal-Mechanical Deformation of Bonding Wires Under Silicone Gel Using LF-OCT

Zhao, Zhiyi ORCID: 0000-0002-3533-3804, Zhang, Zijian ORCID: 0000-0002-3004-6697, Lawman, Samuel, Yin, Zhihao, Hu, Yihua ORCID: 0000-0002-1007-1617, Xu, Ju and Shen, Yaochun ORCID: 0000-0002-8915-1993
(2021) Characterisation of Electrical-Thermal-Mechanical Deformation of Bonding Wires Under Silicone Gel Using LF-OCT. IEEE Transactions on Power Electronics, 36 (10). p. 1.

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Bonding wires are one of the most failure-prone components of power electronics' modules, and silicone gel is usually employed to encase bonding wires. To study the deformation of silicone gel-encased bonding wires, in this article, we report the use of line-field optical coherence tomography (LF-OCT) technique to precisely measure the electrical-thermal-mechanical (ETM) deformation of bonding wires. An LF-OCT system was developed to capture the whole cross-sectional image (B-scan) of the bonding wire sample in a single-shot fashion due to its advantageous parallel detection scheme. This, together with the Fourier phase self-referencing technique, allows the deformation of the bonding wires to be quantitatively measured down to the range of 0.1 nm. The maximum sampling rate (framerate) of the deformation measurement achieved was 400 Hz when setting camera imaging size to 1920 × 200 pixels, providing a temporal resolution of 2.5 ms for monitoring the ETM deformation dynamics of the bonding wire. We found that the ETM deformation of the gel-encased bonding wire was about three times smaller than that of the bare bonding wire. These results represent the first experimental demonstration that the LF-OCT could be a useful analytical tool for studying the time-dependent ETM deformation of bonding wires encased by silicone gel.

Item Type: Article
Uncontrolled Keywords: Wires, Bonding, Strain, Temperature measurement, Semiconductor device measurement, Current measurement, Cameras, Bond wire reliability, electrical-thermal-mechanical (ETM) deformation, line-field optical coherence tomography (LF-OCT), silicone gel
Divisions: Faculty of Health and Life Sciences
Faculty of Health and Life Sciences > Institute of Life Courses and Medical Sciences
Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 08 Apr 2021 08:33
Last Modified: 18 Jan 2023 22:54
DOI: 10.1109/tpel.2021.3068128
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