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Micromachines 2018, 9(12), 644; https://doi.org/10.3390/mi9120644

Fabrication and Characteristics of SnAgCu Alloy Nanowires for Electrical Connection Application

1
Department of Industrial Education, National Taiwan Normal University, 106 Taipei, Taiwan
2
Department of Electron Microscopy Development Application, Industrial Technology Research Institute, 310 Hsinchu, Taiwan
3
Department of Mechanical Engineering, Lunghwa University of Science and Technology, 333 Taoyuan, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 15 November 2018 / Revised: 27 November 2018 / Accepted: 3 December 2018 / Published: 5 December 2018
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Abstract

As electronic products become more functional, the devices are required to provide better performances and meet ever smaller form factor requirements. To achieve a higher I/O density within the smallest form factor package, applying nanotechniques to electronic packaging can be regarded as a possible approach in microelectronic technology. Sn-3.0 wt% Ag-0.5 wt% Cu (SAC305) is a common solder material of electrical connections in microelectronic devices. In this study, SAC305 alloy nanowire was fabricated in a porous alumina membrane with a pore diameter of 50 nm by the pressure casting method. The crystal structure and composition analyses of SAC305 nanowires show that the main structure of the nanowire is β-Sn, and the intermetallic compound, Ag3Sn, locates randomly but always appears on the top of the nanowire. Furthermore, differential scanning calorimetry (DSC) results indicate the melting point of SAC305 alloy nanowire is around 227.7 °C. The melting point of SAC305 alloy nanowire is significantly higher than that of SAC305 bulk alloy (219.4 °C). It is supposed that the non-uniform phase distribution and composite difference between the nanowires causes the change of melting temperature. View Full-Text
Keywords: SAC305; solder; nanowires; intermetallic compound; electrical connection SAC305; solder; nanowires; intermetallic compound; electrical connection
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Chen, J.-H.; Lo, S.-C.; Hsu, S.-C.; Hsu, C.-Y. Fabrication and Characteristics of SnAgCu Alloy Nanowires for Electrical Connection Application. Micromachines 2018, 9, 644.

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