Contributions of the nanoparticles and glass frit to conductivity in Pb-free silver paste

Sung Hyun Park; Dong Seok Seo; Gwon Seung Yang; Jong Kook Lee

doi:10.1117/12.780134

1 November 2007 Contributions of the nanoparticles and glass frit to conductivity in Pb-free silver paste

Sung Hyun Park, Dong Seok Seo, Gwon Seung Yang, Jong Kook Lee

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64235J (2007) https://doi.org/10.1117/12.780134
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

Pb-free silver paste for low sintering temperature was prepared by mixing of two commercial silver powders (0.8 μm and 1.6 μm in size) and nanoparticles (30-50 nm in size). The silver nanoparticles were synthesized by a chemical reduction method using surfactant. To prepare Pb-free silver paste, 10 wt% and 20 wt% of the silver nanoparticles as sintering aids were added to commercial silver powder. Then, 3 wt% of Pb-free frit (Bi₂O₃-ZnO-CuO system) was added to the mixed powders. Using the paste, thick films were prepared by a screen printing on an alumina substrate and the films were sintered at temperature from 400°C to 550°C. As increasing the sintering temperature, the thick films showed denser microstructure. Improvement of connectivity in the films was attributed to the nanoparticles present at neck of micron-sized grains and the effect of liquid phase sintering by the glass frit. The films had thickness of 4-6 μm and their sheet resistivity decreased from 6.0 to 2.8 μΩcm corresponding to the degree of densification.

Citation Download Citation

Sung Hyun Park, Dong Seok Seo, Gwon Seung Yang, and Jong Kook Lee "Contributions of the nanoparticles and glass frit to conductivity in Pb-free silver paste", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235J (1 November 2007); https://doi.org/10.1117/12.780134

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