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Inkjet Printing of Small Droplets Using M-shaped Waveforms  

Hong, Songeun (School of Electrical & Electronic & Communication Engineering)
Choi, Jiho (School of Electrical & Electronic & Communication Engineering)
Kim, Gieun (Future Convergence Engineering, Korea University of Technology and Education)
Park, Jongwoon (School of Electrical & Electronic & Communication Engineering)
Publication Information
Journal of the Semiconductor & Display Technology / v.20, no.3, 2021 , pp. 51-56 More about this Journal
Abstract
Using an inkjet printing process, we have investigated a droplet formation of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) near the orifice of a piezoelectric inkjet head. With an attempt to form the smallest droplet without any satellites, we have applied various waveforms such as the unipolar, bipolar, and M-shaped waveforms. It is found that the droplet velocity and volume vary depending sensitively on the waveform width and voltage. Of those, the M-shaped waveform is shown to provide the smallest droplet volume, followed by the bipolar and then unipolar waveforms. The droplet printed on a PET film roll by the M-shaped waveform has the diameter as small as 46.1 ㎛. It is likely that the second short unipolar in the M-shape waveform increases the droplet velocity gradient, rendering the droplet smaller.
Keywords
Inkjet Printing; PEDOT:PSS; Waveforms; Droplets; Satellites;
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