Pulsed electrohydrodynamic printing (EHDP) is used to fabricate conductive silver patterns with micrometer resolution. The silver ink pendant experiences swelling, pulsation, and ejection under an applied pulse voltage of 20 Hz. The droplet deposition frequency is equal to the applied voltage frequency so that the EHDP can deposit silver ink on demand. A low applied voltage favors uniform and non-scattering silver patterns while a high applied voltage results in ink scattering. Discrete droplets with 45–55 μm in diameter and continuous tracks with 60 μm in width are generated by using a 110-μm-cailber nozzle. The feature size of deposited patterns is about half of the nozzle caliber, and a finer resolution can be achieved with the introduction of smaller nozzle calibers. Furthermore, the appropriate curing condition is investigated for sufficient combustion of ink solvent. The minimum resistivity of 3.3 μΩ cm is demonstrated for a continuous track cured at 200°C for 10 min. Eventually, several passive electrical components, such as coated resistors, interdigitated capacitors (6 pF), and spiral inductors (0.6 μH), are successfully fabricated.
electrohydrodynamic printing inkjet printing drop on demand printed electronics silver ink conductive pattern
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Sirringhaus H, Kawase T, Friend R H, et al. High-resolution inkjet printing of all-polymer transistor circuits. Science, 2000, 290(5499): 2123–2126CrossRefGoogle Scholar
Singh M, Haverinen H M, Dhagat P, et al. Inkjet printing-process and its applications. Adv Mater, 2010, 22(6): 673–685CrossRefGoogle Scholar
Krebs F C. Fabrication and processing of polymer solar cells: A review of printing and coating techniques. Sol Energ Mat and So C, 2009, 93(4): 394–412CrossRefGoogle Scholar
Calvert P. Inkjet printing for materials and devices. Chem Mater, 2001, 13(10): 3299–3305CrossRefGoogle Scholar
Parashkov R, Becker E, Riedl T, et al. Large area electronics using printing, methods. P IEEE, 2005, 93(7): 1321–1329CrossRefGoogle Scholar
Derby B. Inkjet printing of functional and structural materials: Fluid property requirements, feature stability, and resolution. Annu Rev Mater Res, 2010, 40: 395–414CrossRefGoogle Scholar
Park J U, Hardy M, Kang S J, et al. High-resolution electrohydrodynamic jet printing. Nat Mater, 2007, 6(10): 782–789CrossRefGoogle Scholar
Choi J, Kim Y J, Lee S, et al. Drop-on-demand printing of conductive ink by electrostatic field induced inkjet head. Appl Phys Lett, 2008, 93(19): 19358Google Scholar
Kim J, Oh H, Kim S S. Electrohydrodynamic drop-on-demand patterning in pulsed cone-jet mode at various frequencies. J Aerosol Sci, 2008, 39(9): 819–825CrossRefGoogle Scholar
Wang K, Paine M D, Stark J P W. Fully voltage-controlled electrohydrodynamic jet printing of conductive silver tracks with a sub-100 μm linewidth. J Appl Phys, 2009, 106(2): 024907CrossRefGoogle Scholar
Xu L, Wang X, Lei T P, et al. Electrohydrodynamic deposition of polymeric droplets under low-frequency pulsation. Langmuir, 2011, 27(10): 6541–6548CrossRefGoogle Scholar
Deegan R D, Bakajin O, Dupont T F, et al. Capillary flow as the cause of ring stains from dried liquid drops. Nature, 1997, 389(6653): 827–829CrossRefGoogle Scholar
Kim B, Kim I, Joo S W, et al. Electrohydrodynamic repulsion of droplets falling on an insulating substrate in an electric field. Appl Phys Lett, 2009, 95(20): 204106CrossRefGoogle Scholar