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Materials 2016, 9(7), 564; doi:10.3390/ma9070564

Characterizations of Rapid Sintered Nanosilver Joint for Attaching Power Chips

1
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, 135# Yaguan Road, Jinnan District, Tianjin 300350, China
2
Tianjin Key Laboratory of Advanced Joining Technology and School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
3
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
4
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Eugene A. Olevsky
Received: 9 May 2016 / Revised: 11 June 2016 / Accepted: 27 June 2016 / Published: 12 July 2016
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Abstract

Sintering of nanosilver paste has been extensively studied as a lead-free die-attach solution for bonding semiconductor power chips, such as the power insulated gated bipolar transistor (IGBT). However, for the traditional method of bonding IGBT chips, an external pressure of a few MPa is reported necessary for the sintering time of ~1 h. In order to shorten the processing duration time, we developed a rapid way to sinter nanosilver paste for bonding IGBT chips in less than 5 min using pulsed current. In this way, we firstly dried as-printed paste at about 100 °C to get rid of many volatile solvents because they may result in defects or voids during the out-gassing from the paste. Then, the pre-dried paste was further heated by pulse current ranging from 1.2 kA to 2.4 kA for several seconds. The whole procedure was less than 3 min and did not require any gas protection. We could obtain robust sintered joint with shear strength of 30–35 MPa for bonding 1200-V, 25-A IGBT and superior thermal properties. Static and dynamic electrical performance of the as-bonded IGBT assemblies was also characterized to verify the feasibility of this rapid sintering method. The results indicate that the electrical performance is comparable or even partially better than that of commercial IGBT modules. The microstructure evolution of the rapid sintered joints was also studied by scanning electron microscopy (SEM). This work may benefit the wide usage of nanosilver paste for rapid bonding IGBT chips in the future. View Full-Text
Keywords: nanosilver; die-attach; current-assisted sintering; rapid joining; characterization nanosilver; die-attach; current-assisted sintering; rapid joining; characterization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Feng, S.-T.; Mei, Y.-H.; Chen, G.; Li, X.; Lu, G.-Q. Characterizations of Rapid Sintered Nanosilver Joint for Attaching Power Chips. Materials 2016, 9, 564.

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