Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Impact of coffee ring effect on the $Al_2O_3$ thick films by Using Inkjet Printing Process

  • Hwang, Myung-Sung (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Jang, Hun-Woo (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Ji-Hoon (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Koo, Eun-Hae (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hyo-Tae (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Yoon, Young-Joon (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Jong-Hee (Future Convergence Ceramic Division, Korea Institute of Ceramic Engineering and Technology)
  • Published : 2009.06.18
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Abstract

We have investigated the impact of coffee ring effect on the inkjet-printed $Al_2O_3$ thick films. In a single solvent system such as Dimethylformamide, the coffee-ring-pattern has appeared on the edge of sessile drop after evaporation. The peak-to-valley height difference in $Al_2O_3$ coffee ring is over 2um. This non-uniform deposition of $Al_2O_3$ over the surface leads to sever surface roughness of the inkjet-printed films. However, we have manipulated our printing parameters to improve the surface roughness and the packing density of the printed $Al_2O_3$ films. Our inkjet-printed $Al_2O_3$ films show 10 times smoother surface than the initially printed sample's surface. Also the packing density of the printed Ah03 film becomes 70% of high packed $Al_2O_3$. In this presentation, we would like to present the key process parameters of the inkjet printing process to overcome the genetic coffee ring problem.

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