Zhao, Zhiyi 
ORCID: 0000-0002-3533-3804, Zhang, Zijian ORCID: 0000-0002-3004-6697, Lawman, Samuel ORCID: 0000-0003-2695-4366, 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.
ISSN 0885-8993, 1941-0107
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Abstract
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 & Life Sciences Faculty of Health & Life Sciences > Inst. Life Courses & Medical Sciences Faculty of Science & Engineering > School of Electrical Engineering, Electronics and Computer Science |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 08 Apr 2021 08:33 |
| Last Modified: | 01 Mar 2026 11:04 |
| DOI: | 10.1109/tpel.2021.3068128 |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3118402 |
| Disclaimer: | The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate. |
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