Characteristics of solderable electrically conductive adhesives (ECAs) for electronic packaging

被引:24
|
作者
Yim, Byung-Seung [1 ]
Kwon, Yumi [2 ]
Oh, Seung Hoon [1 ]
Kim, Jooheon [2 ]
Shin, Yong-Eui [1 ]
Lee, Seong Hyuk [1 ]
Kim, Jong-Min [1 ]
机构
[1] Chung Ang Univ, Sch Mech Engn, Seoul 156756, South Korea
[2] Chung Ang Univ, Sch Chem Engn & Mat Sci, Seoul 156756, South Korea
关键词
POINT ALLOY FILLERS; SELF-ORGANIZED INTERCONNECTION; DENSITY; JOINT; FILM;
D O I
10.1016/j.microrel.2011.12.004
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This study investigated the effect of the viscosity of the ECAs using a low-melting-point alloy (LMPA) filler on its bonding characteristics. The curing behaviors of the ECAs were determined using Differential Scanning Calorimetry (DSC), and ECA temperature-dependant viscosity characteristics were observed using a torsional parallel rheometer. The wetting test was conducted to investigate the reduction capability of ECAs and the flow-coalescence-wetting behavior of the LMPAs in ECAs. Electrical and mechanical properties were determined and compared to those with commercial ECAs and eutectic tin/lead (Sn/Pb) solder. In the metallurgically interconnected Quad Flat Package (QFP) joint, a typical scallop-type Cu-Sn intermetallic compound (IMC) layer formed at the upper SnBi/Cu interface after curing process. On the other hand, a (Cu, Ni)(6)Sn-5 IMC layer formed on the SnBi/ENIG interface. In addition, the fracture surface exhibited by cleavage fracture mode and the fracture was propagated along the Cu-Sn IMC/SnBi interface. The extremely low-level viscosity of ECAs had a significant influence on the flow-coalescence-wetting behavior of the LMPAs in ECAs and also on the interconnection properties. Stable interconnected assemblies showed good electrical and mechanical properties. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1165 / 1173
页数:9
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