FineMetalLine Patterning on Hydrophilic Non-Conductive SubstratesBased on EHD Printing withLaser Sintering

S. Son, S. Lee, Y-J Kim, K. An, J. Choi
Sungkyunkwan University, KR

Keywords: EHD, printing, metalline patterning

Summary:

In this paper, we report the successful EHD printing and laser sintering of a 5 um width of metal line patterns, with the line thickness of over 340 nm, on a hydrophilic non-conductive glass substrate without any prior surface treatment for the repair of FPDS. The application of laser sintering to the above, EHD printed, metal line was successful for meeting the required conductivity of less than 60 μΩ∙cm, while avoiding thermal damages. There are two critical issues to overcome: 1) Printing on a non-conductive substrate such as glass is subject to sprays scattered around the patterned line 2) Printing on a hydrophilic surface such as glass without prior surface treatment is subject to ink spreading such that the width of printed line patterns becomes as much as 5 times larger than the actual diameter of jetting. What we found is that, by optimizing the parameters involved in EHD printing, such as the distance between the substrate and the nozzle, the speed of the moving stage, as well as the applied voltage and pressure, we can be successful in EHD printing of desired line width and thickness, while overcoming the two issues described above.