Research Papers

System Design and Process Optimization for the Inkjet Printing of PEDOT:Poly(styrenesulfonate)

[+] Author and Article Information
P. Wilson

Department of Mechanical Engineering Sciences,
Faculty of Engineering and Physical Sciences,
University of Surrey,
Guildford, Surrey GU2 7XH, UK
e-mail: peter.wilson@surrey.ac.uk

C. Lekakou

Department of Mechanical Engineering Sciences,
Faculty of Engineering and Physical Sciences,
University of Surrey,
Guildford, Surrey GU2 7XH, UK
e-mail: C.Lekakou@surrey.ac.uk

J. F. Watts

Department of Mechanical Engineering Sciences,
Faculty of Engineering and Physical Sciences,
University of Surrey,
Guildford, Surrey GU2 7XH, UK
e-mail: j.watts@surrey.ac.uk

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF Micro- AND Nano-Manufacturing. Manuscript received May 30, 2013; final manuscript received December 11, 2013; published online January 27, 2014. Assoc. Editor: John P. Coulter.

J. Micro Nano-Manuf 2(1), 011004 (Jan 27, 2014) (9 pages) Paper No: JMNM-13-1035; doi: 10.1115/1.4026272 History: Received May 30, 2013; Revised December 11, 2013

A laboratory-scale inkjet printing system was designed for printing polymeric inks with the focus on PEDOT:PSS, a transparent, electrically conductive polymer. PEDOT:PSS inks with 0 and 1 wt. % Surfynol were tested rheologically in elongational and shear flows. A process model is presented and validated for the prediction of flow boundary after the ink exits the nozzle, including drop formation. Process optimization involved establishing a process window related to the voltage waveform, substrate temperature, speed and printed line-overlap, aiming at avoiding satellite drops, “coffee cup” rings, the Rayleigh instability, “stacked printed lines,” and discontinuities in the printed lines or films.

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Ali, A., Rahman, A., Choi, K. H., Yang, B. S., and Kim, D. S., 2010, “Interface Attachability Analysis of Printed Patterns Through Electrostatic Inkjet System,” Innovative Developments in Design and Manufacturing, P. J.da Silva Bartolo, M. A.Jorge, F.da Conceicao Batista, H. A.Almeida, J. M.Matias, J. C.Vasco, J. B.Gaspar, M. A.Correia, N. C.Andre, N. F.Alves, P. P.Novo, P. G.Martinho, and R. A.Carvalho, eds., Taylor & Francis, London, pp. 377–380.
Shah, V. J., and Wallace, D. B., 2004, “Low-Cost Solar Cell Fabrication by Drop-on-Demand Ink-Jet Printing,” Proceeding of IMAPS 37th Annual International Symposium on Microelectronics, Long Beach, CA, pp. 1–6.
Yun, M. H., Kim, G. H., Yang, C., and Kim, J. Y., 2010, “Towards Optimization of P3HT:BISPCBM Composites for Highly Efficient Polymer Solar Cells,” J. Mater. Chem., 20, pp. 7710–7714. [CrossRef]
Yu, H. Z., and Peng, J. B., 2008, “Annealing Treatment Effect on Photoelectric Properties of P3HT:PCBM Blend System,” Acta Physicochim. Sin., 24, pp. 905–908.
Jung, J. W., and Jo, W. H., 2010, “Annealing-Free High Efficiency and Large Area Polymer Solar Cells Fabricated by a Roller Painting Process,” Adv. Funct. Mater., 20, pp. 2355–2363. [CrossRef]
Kim, W. H., Makinen, A. J., Nikolov, N., Shashidhar, R., Kim, H., and Kafafi, Z. H., 2002, “Molecular Organic Light-Emitting Diodes Using Highly Conducting Polymers as Anodes,” Appl. Phys. Lett., 80, pp. 3844–3846. [CrossRef]
Lopez, M. A., Sanchez, J. C., and Estrada, M., 2008, “Characterization of PEDOT:PSS Dilutions for Inkjet Printing Applied to OLED Fabrication,” ProcEEDING 7th International Caribbean Conference on Devices, Circuits and Systems, Cancun, Mexico, pp. 165–168.
Lee, S. H., Hwang, J. Y., Kang, K., and Kang, H., 2009, “Fabrication of Organic Light Emitting Display Using Inkjet Printing Technology,” Proceeding of International Symposium on Optomechatronic Technologies, Istanbul, Turkey. pp. 71–76.
Wilson, P., Lekakou, C., and Watts, J. F., 2012, “A Comparative Assessment of Surface Microstructure and Electrical Conductivity Dependence on Co-Solvent Addition in Spin Coated and Inkjet Printed Poly(3,4-Ethylenedioxythiophene):Polystyrene Sulphonate (PEDOT:PSS),” Org. Electron., 13(3), pp. 409–418. [CrossRef]
Yoshioka, Y., and Jabbour, G. E., 2006, “Desktop Inkjet Printer as a Tool to Print Conducting Polymers,” Synth. Met., 156(11–13), pp. 779–783. [CrossRef]
de Gans, B. J., Duineveld, P. C., and Schubert, U. S., 2004, “Inkjet Printing of Polymers: State of the Art and Future Developments,” Adv. Mater., 16(3), pp. 203–213. [CrossRef]
Snaith, H. J., Kenrick, H., Chiesa, M., and Friend, R. H., 2005, “Morphological and Electronic Consequences of Modifications to the Polymer Anode ‘PEDOT:PSS,’” Polymer, 46(8), pp. 2573–2578. [CrossRef]
Wilson, P. C., Schoinas, D., Lekakou, C., and Watts, J. F., 2009, “Roadmap for Organic and Printed Electronics,” Polymer Electronics–—A flexible technology, F.Gardiner and E.Carter, eds., iSmithers Rapra, Shrewbury, UK, pp. 31–42.
Hoath, S. D., Jung, S., Hsiao, W.-K., and Hutchings, I. M., 2012, “How PEDOT:PSS Solutions Produce Satellite-Free Inkjets,” Org. Electron. Phys. Mater. Appl., 13, pp. 3259–3262.
Zhou, J. X., Fuh, J. Y. H., Loh, H. T., Wong, Y. S., Ng, Y. S., Gray, J. J., and Chua, S. J., 2010, “Characterization of Drop-on-Demand Microdroplet Printing,” Int. J. Adv. Manuf. Technol., 48, pp. 243–250. [CrossRef]
Schiaffino, S., and Sonin, A. A., 1997, “Formation and Stability of Liquid and Molten Beads on a Solid Surface,” J. Fluid Mech., 343, pp. 95–110. [CrossRef]
Soltman, D., Smith, B., Kang, H., Morris, S. J. S., and Subramanian, V., 2010, “Methodology for Inkjet Printing of Partially Wetting Films,” Langmuir, 26(19), pp. 15686–15693. [CrossRef] [PubMed]
Rensch, C., 2006, “Creation of Small Microdrops,” MicroFab Technologies, Inc., Plano, p. 1.
MicroFab Technologies, Inc., 2007, “Satellites Occurrence and Approaches to Eliminate Them,” MicroFab Technical Notes.
Bogy, D. B., and Talke, F. E., 1984, “Experimental and Theoretical Study of Wave Propagation Phenomena in Drop-on-Demand Inkjet Devices,” IBM J. Res. Dev., 28(3), pp. 314–321. [CrossRef]
Ikegawa, M., and Azuma, H., 2004, “Droplet Behaviors on Substrates in Thin-Film Formation Using Ink-Jet Printing,” JSME Int. J., Ser. B, 47(3), pp. 490–496. [CrossRef]
Deegan, R. D., 2000, “Pattern Formation in Drying Drops,” Phys. Rev. E, 61(1), pp. 475–485. [CrossRef]
Gao, F. Q., and Sonin, A. A., 1994, “Precise Deposition of Molten Microdrops—the Physics of Digital Microfabrication”, Proc. R. Soc. London Ser. A, 444(1922), pp. 533–554. [CrossRef]
Duineveld, P. C., 2003, “The Stability of Ink-Jet Printed Lines of Liquid with Zero Receding Contact Angle on a Homogeneous Substrate,” J. Fluid Mech., 477, pp. 175–200. [CrossRef]
Hu, H., and Larson, R. G., 2002, “Evaporation of a Sessile Droplet on a Substrate,” J. Phys. Chem. B, 106(6), pp. 1334–1344. [CrossRef]
Gates, D. M., 2003, Biophysical Ecology, Dover Publications, New York, p. 635.


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Fig. 1

Diagram of the inkjet printing system

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Fig. 2

Rheological data of (a) viscosity μ as a function of shear rate dγ/dt and (b) elongational viscosity μelong as a function of strain rate dε/dt for the PEDOT:PSS ink without and with 1 wt. % Surfynol

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Fig. 3

Drop velocity at 500 μs from the nozzle as a function of drive architecture dwell time for PEDOT:PSS (0% Surfynol). In the case of satellite drop formation, the velocity of the fastest drop has been recorded

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Fig. 4

Image observation of drop flight and generation from a 25 V double waveform of different dwell times in the range of 14–28 μs.

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Fig. 5

Drop velocity at 500 μs from the nozzle as a function of the inputted voltage waveform shape and dwell time for PEDOT:PSS water ink with 1% Surfynol. In the case of satellite drop formation, the velocity of the fastest drop has been recorded

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Fig. 6

Snapshots of downwards inkjet flow and drop formation at 500 μs after the ink exits the nozzle for the 30 V single waveform of different pulse times for the two types of PEDOT:PSS ink: (a) with 0% Surfynol and (b) with 1 wt. % Surfynol. Solid line: R versus z predictions; filled gray ellipses: experimental drop images

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Fig. 7

3D plot and 2D profile of inkjet printed PEDOT:PSS at Tsub = 30 and 40 °C, respectively

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Fig. 8

3D plot, “widest-point” 2D profile and top view of inkjet printed PEDOT:PSS drop-line for different values of DCD

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Fig. 9

3D plot, 2D profile and top view of two inkjet printed PEDOT:PSS lines for different values of LCD

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Fig. 10

Profile outlines of two inkjet printed lines at different values of LCD in the range of 105–153 μm



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