Abstract
Fine-line screen printing is still a great challenge due to the lack of overall understanding between the rheological properties and screen printing process. Here, we prepared ZnO pastes including ethyl cellulose or Thixatrol Max as an additive introducing different physical mechanisms of structure and flow control. Yield stress, viscosity, and its recovery after high shear were obtained using rotational rheometry. Filament breakup was determined in uniaxial elongational tests. Pastes were printed using a commercial screen designed for Si-solar cell front-side metallization, and the process was monitored with high temporal and spatial resolution using a transparent glass substrate and a high-speed imaging setup. Length of the pre-injection zone ahead of the squeegee scales inversely with yield stress and length of the cling zone behind the squeegee is proportional to filament rupture strain, irrespective of used additive. Paste spreading observable at the busbar and fine-line intersection takes place within 100 ms, irrespective of sample composition, demonstrating that fine-line electrode width is determined within the pre-injection zone where the paste is under pressure. A simple flow model is proposed relating electrode width to the reciprocal product of yield stress and high shear viscosity consistent with experimental data including both types of pastes.
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Ostfeld, AE, Deckman, I, Gaikwad, AM, Lochner, CM, Arias, AC, “Screen Printed Passive Components for Flexible Power Electronics.” Sci. Rep., 5 15959 (2015)
Eshkeiti, A, Reddy, ASG, Emamian, S, Narakathu, BB, Joyce, M, Joyce, M, Fleming, PD, Bazuin, BJ, Atashbar, MZ, “Screen Printing of Multilayered Hybrid Printed Circuit Boards on Different Substrates.” IEEE Trans. Compon. Packag. Manuf. Technol, 5 (3) 415–421 (2015)
Kim, JH, Kim, J, Lee, GJ, Jeong, J, Choi, B, “Screen-Printed Cu Source/Drain Electrodes for a-InGaZnO Thin-Film Transistors.” Mol. Cryst. Liq. Cryst. Sci. Technol., 586 (1) 161–167 (2013)
Tam, SK, Fung, KY, Ng, KM, “Copper Pastes Using Bimodal Particles for Flexible Printed Electronics.” J. Mater. Sci., 51 (4) 1914–1922 (2016)
Schwanke, D, Pohlner, J, Wonisch, A, Kraft, T, Geng, J, “Enhancement of Fine Line Print Resolution Due to Coating of Screen Fabrics.” J. Microelectron. Electron. Packaing, 6 (1) 13–19 (2009)
Faddoul, R, Reverdy-Bruas, N, Blayo, A, “Formulation and Screen Printing of Water Based Conductive Flake Silver Pastes onto Green Ceramic Tapes for Electronic Applications.” Mater. Sci. Eng. B Adv., 177 (13) 1053–1066 (2012)
Wehmeier, N, Nowack, A, Lim, B, Brendemühl, T, Kajari-Schröder, S, Schmidt, J, Brendel, R, Dullweber, T, “21.0%-Efficient Screen-Printed n-PERT Back-Junction Silicon Solar Cell with Plasma-Deposited Boron Diffusion Source.” Sol. Energy Mater. Sol. Cells, 158 50–54 (2016)
Kumar, P, Pfeffer, M, Willsch, B, Eibl, O, Koduvelikulathu, LJ, Mihailetchi, VD, Kopecek, R, “N-Type Single-Crystalline Si Solar Cells: Front Side Metallization for Solar Cells Reaching 20% Efficiency.” Sol. Energy Mater. Sol. Cells, 157 200–208 (2016)
Phillips, C, Al-Ahmadi, A, Potts, SJ, Claypole, T, Deganello, D, “The Effect of Graphite and Carbon Black Ratios on Conductive Ink Performance.” J. Mater. Sci., 52 (16) 9520–9530 (2017)
Zhang, LJ, Liu, TF, Liu, LF, Hu, M, Yang, Y, Mei, AY, Han, HW, “The Effect of Carbon Counter Electrodes on Fully Printable Mesoscopic Perovskite Solar Cells.” J. Mater. Chem. A, 3 (17) 9165–9170 (2015)
Schubert, G, Huster, F, Fath, P, “Physical Understanding of Printed Thick-Film Front Contacts of Crystalline Si Solar Cells—Review of Existing Models and Recent Developments.” Sol. Energy Mater. Sol. Cells, 90 (18–19) 3399–3406 (2006)
Li, C-W, Chuang, H-C, Li, S-T, “Hedonic Analysis for Consumer Electronics Using Online Product Reviews.” Proc. Advanced Applied Informatics (IIAI-AAI), 2016 5th IIAI International Congress on, 2016
Fellmeth, T, Clement, F, Biro, D, “Analytical Modeling of Industrial-Related Silicon Solar Cells.” IEEE J. Photovolt, 4 (1) 504–513 (2014)
Lin, HW, Chang, CP, Hwu, WH, Ger, MD, “The Rheological Behaviors of Screen-Printing Pastes.” J. Mater. Process. Technol., 197 (1–3) 284–291 (2008)
Lin, J, Wang, C, “Effects of Surfactant Treatment of Silver Powder on the Rheology of Its Thick-Film Paste.” Mater. Chem. Phys., 45 (2) 136–144 (1996)
Rane, SB, Seth, T, Phatak, GJ, Amalnerkar, DP, Das, BK, “Influence of Surfactants Treatment on Silver Powder and Its Thick Films.” Mater. Lett., 57 (20) 3096–3100 (2003)
Hoornstra, J, Weeber, AW, De Moor, HH, Sinke, WC, The Importance of Paste Rheology in Improving Fine Line, Thick Film Screen Printing of Front Side Metallization. Netherlands Energy Research Foundation ECN, (1997)
Zhou, Y, Tong, H, Liu, Y, Yuan, S, Yuan, X, Liu, C, Zhang, Y, Chen, G, Yang, Y, “Rheological Effect on Screen-Printed Morphology of Thick Film Silver Paste Metallization.” J. Mater. Sci. Mater. Electron., 28 (7) 5548–5553 (2017)
Xu, CH, Fiess, M, Willenbacher, N, “Impact of Wall Slip on Screen Printing of Front-Side Silver Pastes for Silicon Solar Cells.” IEEE J. Photovolt, 7 (1) 129–135 (2017)
Riemer, DE, “The Theoretical Fundamentals of the Screen Printing Process.” Microelectronics International, 6 (1) 8–17 (1989)
Glinski, GP, Bailey, C, Pericleous, KA, “A Non-Newtonian Computational Fluid Dynamics Study of the Stencil Printing Process.” Proc. Inst. Mech. Eng. C, 215 (4) 437–446 (2001)
Clements, DJ, Desmulliez, MPY, Abraham, E, “The Evolution of Paste Pressure During Stencil Printing.” Solder Surf. Mt. Tech., 19 (3) 9–14 (2007)
Kapur, N, Abbott, SJ, Dolden, ED, Gaskell, PH, “Predicting the Behavior of Screen Printing.” IEEE Trans. Compon. Packag. Manuf. Technol., 3 (3) 508–515 (2013)
DuPont Conglomerate Company, “DuPont SOLAMET PV 19A Photovoltaic Metallization, Preliminary Technical Data Sheet.”
Yüce, C, Willenbacher, N, “Challenges in Rheological Characterization of Highly Concentrated Suspensions—A Case Study for Screen-printing Silver Pastes.” JoVE, 122 e55377–e55377 (2017)
Rudez, R, Pavlic, J, Bernik, S, “Preparation and Influence of Highly Concentrated Screen-Printing Inks on the Development and Characteristics of Thick-Film Varistors.” J. Eur. Ceram. Soc., 35 (11) 3013–3023 (2015)
Debeda-Hickel, H, Lucat, C, Menil, F, “Influence of the Densification Parameters on Screen-Printed Component Properties.” J. Eur. Ceram. Soc., 25 (12) 2115–2119 (2005)
Lucat, C, Martin, MP, Debeda-Hickel, H, Largeteau, A, Menil, F, “Screen-Printed Varistors: New Strategy for High Non-linear Coefficient.” J. Eur. Ceram. Soc., 27 (13–15) 3883–3886 (2007)
Zargar, RA, Chackrabarti, S, Joseph, S, Khan, MS, Husain, R, Hafiz, AK, “Synthesis and Characterization of Screen Printed ZnO Films for Solar Cell Applications.” Optik, 126 (23) 4171–4174 (2015)
Sarkar, K, Braden, EV, Bonke, SA, Bach, U, Muller-Buschbaum, P, “Screen-Printing of ZnO Nanostructures from Sol–Gel Solutions for Their Application in Dye-Sensitized Solar Cells.” Chemsuschem, 8 (16) 2696–2704 (2015)
Somalu, MR, Yufit, V, Shapiro, IP, Xiao, P, Brandon, NP, “The Impact of Ink Rheology on the Properties of Screen-Printed Solid Oxide Fuel Cell Anodes.” Int. J. Hydrogen Energy, 38 (16) 6789–6801 (2013)
Somalu, MR, Brandon, NP, “Rheological Studies of Nickel/Scandia-Stabilized-Zirconia Screen Printing Inks for Solid Oxide Fuel Cell Anode Fabrication.” J. Am. Ceram. Soc., 95 (4) 1220–1228 (2012)
Darsono, N, Yonathan, P, Yoon, DH, Kim, J, Kim, Y, “Dispersion and Field Emission Properties of Multi-walled Carbon Nanotubes by High-Energy Milling.” Mater. Chem. Phys., 110 (2–3) 363–369 (2008)
Yi, HL, Lai, LJ, Jiang, JS, Hua, CC, “Ethylcellulose Colloids Incubated in Dilute Solution.” J. Phys. Chem. B, 121 (3) 638–648 (2017)
Umerova, S, Dulina, I, Ragulya, A, Konstantinova, T, Glazunova, V, “Rheology of Plasticized Screen Printing Pastes Based on Batio3 Nanopowder.” Appl. Rheol., 26 (3) 38–46 (2016)
Inukai, K, Takahashi, Y, Murakami, S, Ri, K, Shin, W, “Molecular Weight Dependence of Ethyl Cellulose Adsorption Behavior on (La, Sr)(Ti, Fe) O3− δ Particles in Organic Solvent Pastes and Their Printing Properties.” Ceram. Int., 40 (8) 12319–12325 (2014)
Inukai, K, Takahashi, Y, Ri, K, Shin, W, “Rheological Analysis of Ceramic Pastes with Ethyl Cellulose for Screen-Printing.” Ceram. Int., 41 (4) 5959–5966 (2015)
Qin, J, Bai, S, Zhang, W, Liu, Z, Wang, H, “Effects of Organic Medium on Rheological Properties of Silver Pastes for Crystalline Silicon Solar Cells.” Circuit World, 42 (2) 77–83 (2016)
Qin, J, Zhang, W, Liu, Z, Bai, S, “Effects of Polymer Binder on Rheological Properties of Silver Pastes for Screen Printing Front Electrode Films of Solar Cells.” Int. J. Mod. Phys. B, 29 (10n11) 1540027 (2015)
Elementis Specialties, Inc, Rheology Handbook: A Practical Guide to Rheological Additives. (2008)
Mezger, TG, The Rheology Handbook: For Users of Rotational and Oscillatory Rheometers. Vincentz Network GmbH & Co KG, Hanover, 2006
Endo, Y, Mitta, R, Watabe, T, Otsuka, H, “Screen Printing Plate for Solar Cell and Method for Printing Solar Cell Electrode.” Grant US9216607 B2, 2015
Hsu, CP, Guo, RH, Hua, CC, Shih, C-L, Chen, W-T, Chang, T-I, “Effect of Polymer Binders in Screen Printing Technique of Silver Pastes.” J. Polym. Res., 20 (10) 277 (2013)
Sachsenheimer, D, Hochstein, B, Willenbacher, N, “Experimental Study on the Capillary Thinning of Entangled Polymer Solutions.” Rheol. Acta, 53 (9) 725–739 (2014)
Martinie, L, Buggisch, H, Willenbacher, N, “Apparent Elongational Yield Stress of Soft Matter.” J. Rheol., 57 (2) 627–646 (2013)
Larson, RG, The Structure and Rheology of Complex Fluids. Oxford University Press, New York, 1999
Aoki, M, Nakamura, K, Tachibana, T, Sumita, I, Hayashi, H, Asada, H, Ohshita, Y, “30 μm Fine-Line Printing for Solar Cells.” Proc. Photovoltaic Specialists Conference (PVSC), 2013 IEEE 39th, 2013
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The authors would like to acknowledge support from BASF SE, especially the fruitful discussion with Dr. H. Dietsch and the technical support from M. Machate and B. Strubel for setting up the screen printer.
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Xu, C., Willenbacher, N. How rheological properties affect fine-line screen printing of pastes: a combined rheological and high-speed video imaging study. J Coat Technol Res 15, 1401–1412 (2018). https://doi.org/10.1007/s11998-018-0091-2
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DOI: https://doi.org/10.1007/s11998-018-0091-2