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Proceedings Paper

Contributions of the nanoparticles and glass frit to conductivity in Pb-free silver paste
Author(s): Sung Hyun Park; Dong Seok Seo; Gwon Seung Yang; Jong Kook Lee
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Paper 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.

Paper Details

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235J (1 November 2007); doi: 10.1117/12.780134
Show Author Affiliations
Sung Hyun Park, Chosun Univ. (South Korea)
Dong Seok Seo, Chosun Univ. (South Korea)
Gwon Seung Yang, Chosun Univ. (South Korea)
Jong Kook Lee, Chosun Univ. (South Korea)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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