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A Homogeneous Electrically Conductive Silver Paste

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5 Author(s)
Jianguo Liu ; Wuhan National Laboratory for Optoelectronics, College of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan, China ; Yu Cao ; Xiaoye Wang ; Jun Duan
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A homogeneous electrically conductive silver paste was developed using silver i-propylcarbamate ((CH3)2CHNHCOOAg) as the precursor of functional phase. The precursor had good solubility in water and methanol, high silver content (about 50 wt.%) and low decomposition temperature (below 200 °C). The paste was a non-Newtonian fluid with the viscosity depending significantly on the content of thickening agent (ethyl cellulose). When the paste was applied in micro-pen direct-writing process, it was able to produce high-resolution (20 μm or so) array patterns. After a homogeneous paste with about 40 wt.% silver i-propylcarbamate as the precursor was directly written and sintered at 180 °C for 15 min, an electrically conductive network consisting of more than 95 wt.% silver was formed and the network had a volume electrical resistivity in the order of magnitude of 10-5-10-6 Ω · cm and a sheet electrical resistivity in the order of magnitude of 10-4 Ω/square.

Published in:

IEEE Transactions on Advanced Packaging  (Volume:33 ,  Issue: 4 )