Hwang W-S – TechConnect Briefs

The Effects of Dwell_time of Monopolar Waveform on Droplet Formation through the Analysis of Fluid Propagation Direction

Wu C.H., Hwang W-S, National Cheng Kung University, TW

For inkjet printing, the fluid dynamics in a capillary tube caused by the movement of the piezoelectric material is essential due to the need to adjust the voltage pulse waveform, but it has seldom been [...]

A Study of Molten Lead-Free Solder Deposited by Inkjet Printing for Interconnections of Thin-Film Solar Cell Modules

Chen W-M, Wang C-H, Hwang W-S, National Cheng Kung University, TW

Solar cell modules generally are bonded with photovoltaic ribbon using silver paste to increase photovoltaic conversion efficiency. However, the joint strength of silver paste between the aluminum back electrode and the ribbon may be the [...]

Effects of Inkjet Printing Parameters on Conductive Line Patterns for Flexible Electronics Applications

Tsai H.L., Hwang W-S, Liu Y-F, Wu J.-T., Hsu S.L.-C., National Cheng Kung University, TW

Aqueous silver nitrate ink (5 moles/liter) mixed with poly(N-vinyl-2-pyrrolidone) (PVP) was employed in a piezoelectric inkjet printing apparatus to construct conductive patterns on ultraviolet/O3-treated polyimide substrates. At a pulse amplitude of ±38 V, single droplets [...]

Effects of Poly-(N-vinyl-2-pyrrolidone) Additive on Direct-Inkjet-Printed Silver Nitrate Conductive Lines

Liu Y-F, Feng P.H., Tsai H.L., Hwang W-S, National Cheng Kung University, TW

All-printed electronics has attracted attention due to their fast processing and low cost. Inkjet printing allows circuit components to be directly drawn at a specific area in one step. The printed patterns can be used [...]

Effect of Pressure Variation on Inkjet-Printed Line Pattern with Various Step Sizes of Ejected Droplets

Wang J-K, Hwang W-S, Tsai M-H, Liu Y-F, National Cheng Kung University, TW

This study investigates the effect of droplet deposition dynamics on inkjet-printed line features of deionized water using numerical analysis. Simulation results show that kinetic energy dissipation during the droplet deposition process transforms into inner wave [...]