Abstract
In this study, ultra-small nano-Ag particles with an average diameter of 4.76 nm and excellent stability have been synthesized on a large scale to meet low-temperature, low-pressure, and lead-free packaging requirements for modern high-power electronic applications. Citrate coated nano-Ag particles’ agglomerations have been used in the form of a nano-Ag paste to solder by a robust Cu to Cu direct bonding. The bonding strength of the formed Cu-Cu joint reaches 28.2 MPa when sintered at 260 °C for 30 min and 1 MPa. The bonding mechanism of such a direct Cu-Cu bonding by using nano-Ag paste has been facilitated by the assistance of an in-situ sintering of nano-Ag particles. The analysis of the bonding has been performed using a transmission electron microscopy (TEM) and a focused ion beam (FIB). The results show that the bonding mechanism can be interpreted by two parts: (1) self-sintering process of nano-Ag paste, and (2) interfacial bonding between sintered nano-Ag paste and Cu substrate.
| Original language | English |
|---|---|
| Pages (from-to) | 546-554 |
| Number of pages | 9 |
| Journal | Journal of Manufacturing Processes |
| Volume | 62 |
| DOIs | |
| State | Published - Feb 2021 |
Keywords
- Bonding mechanism
- Cu-Cu joint
- Electronic packaging
- Low-temperature sintering
- Nano-Ag paste
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