Enhanced pressureless bonding by Tin Doped Silver Paste at low sintering temperature
| Autor: | Yunhui Mei, Cheng-Xiang Yang, Guo-Quan Lu, Xin Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Doping Sintering chemistry.chemical_element Solder paste 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Solid solution strengthening chemistry Mechanics of Materials Phase (matter) 0103 physical sciences General Materials Science Composite material 0210 nano-technology Tin Solid solution |
| Zdroj: | Materials Science and Engineering: A. 660:71-76 |
| ISSN: | 0921-5093 |
| Popis: | The nanosilver sintering die-attach technique has been a promising alternative for wide band gap semiconductors. However, it is less preferable in industry because of its high sintering temperature. Recently research has been initiated to develop transient liquid phase sintering (TLPS) solder paste for use in electronics packaging. In this article, in order to lower the sintering temperature of nanosilver paste, we develop a novel tin (up to 10 wt%) doped silver paste (TDSP) and a sintering profile with the highest processing temperature of 235 °C based on TLPS. Sintered TDSP is Ag/Ag3Sn/Ag–Sn solid solution composites. The composites have a microstructure of Ag matrix grains reinforced by Ag3Sn and Ag–Sn solid solution within the matrix grains. And this microstructure endows the sintered Ag+4%Sn with a pressureless bonding strength of 23 MPa. The improved mechanical properties of sintered TDSP are attributed to second-phase strengthening and solid solution strengthening mechanisms. However, the overmuch formation of brittle Ag3Sn phase is the main reason resulting in sharp decrease of bonding strength when the Sn content over 5 wt%. The new TDSP technology is expected to be applicable to a wide range of power semiconductors devices, such as organic devices and printed circuit boards. Furthermore, it provides new strategies for low-temperature sintering. |
| Databáze: | OpenAIRE |
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