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Microsystem Technologies

, Volume 25, Issue 12, pp 4753–4759 | Cite as

Flip chip bonding using ink-jet printing technology

  • Hye-Lim Kang
  • Sung-min Sim
  • Yeonsu Lee
  • Jun Ho Yu
  • Kwon-Yong Shin
  • Sang-Ho LeeEmail author
  • Jung-Mu KimEmail author
Technical Paper
  • 128 Downloads

Abstract

In this paper, a bump-forming method for flip chip bonding using ink-jet printing technology is proposed. A flip chip bonded transmission line using ink-jet printed silver bumps consisting of conductive ink containing silver nanoparticles was fabricated to verify the electrical characteristics after the flip chip bonding process. The transmission line was designed according to microstrip theory for a frequency range of 300 kHz to 3 GHz, with the size of fabricated line being 35 (width) × 8.64 (length) × 0.5 (thickness) mm3. The electrical characteristics of a reference microstrip and the flip chip bonded line were compared with FEM simulation and measurement results. Direct current (DC) resistances of both the reference line and the flip chip bonded line were measured to be 3.1 Ω and 3.2 Ω, respectively. The discrepancy between measured insertion loss and the simulation result was only 0.04 dB at 3 GHz, and the return loss was greater than 15 dB in the measurement frequency range. As a result of the analysis, it was confirmed that the DC resistance of ink-jet printed bumps account for 0.56% of the total DC resistance, and the ink-jet printed bumps hardly affected the radio frequency (RF) characteristics of the RF transmission line at low frequencies. The results demonstrate that ink-jet printed silver bumps can be used for a simple and low-cost flip chip bonding process. We expect that the proposed method can be applied to the packaging of various electronics such as flexible, wearable devices and RF applications.

Notes

Acknowledgements

This research was supported by “Research Base Construction Fund Support Program” funded by Chonbuk National University in 2019 and partially supported by the North Atlantic Treaty Organization (NATO), project SfP 984809. We would like to acknowledge the financial support from the Industrial Technology Innovation Program (Project No. 10063277) of the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Division of Electronics and Information EngineeringChonbuk National UniversityJeonjuRepublic of Korea
  2. 2.Korea Institute of Industrial TechnologyAnsanRepublic of Korea
  3. 3.Division of Electronic EngineeringChonbuk National UniversityJeonjuRepublic of Korea

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