| Enhanced electrical conductivity in hybrid Ag paste containing Ag nanoparticles |
| Kyeong-Seob Kwon |
| Chonbuk National University |
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Keywords: Hybrid paste, Ag nanoparticles, Ag paste, Electrical conductivity
Silver (Ag) paste has been widely used in solar cell, display (OLED, LCD, PDP), EMI-related products as an electrode material in a variety of applications with high reliability and low resistance. Ag paste which is the universal filler to micro-sized flakes, shows characteristics of a good electrical conductivity [1]. However, there is a limit to improve the electrical conductivity because the Ag filler with a micro size does not provide a continuous film within the filler, which results in the existence of multiple voids and increased sheet resistance. Recently, there have been reported attempts of using the Ag ink in order to effectively reduce the impact of such voids, but the problems of oxide nanoparticles aggregation phenomena and as high cost have emerged.[2] Hybrid paste obtained by mixing the nano-sized particle and micro-sized particle to circumvent these problems have been previously reported [3].
In this study, we develop hybrid Ag paste by mixing the nano-sized Ag particles in the Ag paste, which is composed of micro-sized Ag flakes in order to improve the electrical properties of the conductive adhesive. The mixture of nano-sized Ag particles in diluent agent was thus fabricated. The hybrid Ag paste was deposited on a slide glass using a 3M tape to form the test pattern. The electrical properties were evaluated after sintering. It was found that the electrical conductivity was greatly improved when the size of the nanoparticles was about 500 nm. This is due to the effective filling of the voids between the flakes and the nano-sized Ag particles.
References:
[1] S. Rane, V. Puri, and D. Amalnerkar, J. Mater. Sci.: Mater. Electron., 11 (2000) 677.
[2] D. Russev, D. Raclev, and S. Kava, J. Met. Finish. 81 (1983) 27-30.
[3] A. Slistan-Grijalvaa, R. Herrera-Urbinab, J.F. Rivas-Silvac, M. Ávalos-Borjad, F.F. Castillón-Barrazad, and A. Posada-Amarillase, Mater. Res. Bull., 43 (2008) 96. |
| Acknowledgements : This research was supported by National Research Foundation of Korea(NRF) funded by Ministry of Science, ICT & Future Planning (2013R1A2A2A07067688, 2010-0019626). |
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