Laser-induced forward transfer of conductive screen-printing inks

Sopeña, Pol; Fernández-Pradas, J.M.; Serra, P.

doi:10.1016/j.apsusc.2019.145047

Cited by 35 publications

(32 citation statements)

References 40 publications

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“…These first voxels always have the same cluster structure. Similar overlapping effects have also been described by Sopeña et al [13] for Ag inks with viscosity one order of magnitude smaller than the Ag paste used in the present work.…”

Section: Discussionsupporting

confidence: 90%

“…Moreover, this effect is more significant in the case of high viscosity metallic pastes [12]. More recently, a similar effect has also been observed in metallic inks with a viscosity one order of magnitude smaller [13].…”

Section: Introductionsupporting

confidence: 61%

“…When the viscosity increases, the time that the fluid needs to fill the hole increases, the column between the donor and acceptor remains, and a spatial effect arises [13]. In the present work, the viscosity is so high that there is no fluid movement after the laser pulse and the void remains for a very long times, and thus the high viscosity paste LIFT can be understood as a "frozen" state of the low viscosity ink LIFT.…”

Section: Discussionmentioning

confidence: 67%

See 2 more Smart Citations

Overlapping Limitations for ps-Pulsed LIFT Printing of High Viscosity Metallic Pastes

Muñoz-Martín

Chen

Morales

et al. 2020

Metals

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Laser-induced forward transfer (LIFT) technique has been used for printing a high viscosity (250 Pa·s) commercial silver paste with micron-size particles (1–4 µm). Volumetric pixels (voxels) transferred using single ps laser pulses are overlapped in order to obtain continuous metallic lines. However, interference problems between successive voxels is a major issue that must be solved before obtaining lines with good morphologies. The effects of the laser pulse energy, thickness of the donor paste film, and distance between successive voxels on the morphology of single voxels and lines are discussed. Due to the high viscosity of the paste, the void in the donor film after a printing event remains, and it negatively affects the physical transfer mechanism of the next laser pulses. When two laser pulses are fired at a short distance, there is no transfer at all. Only when the pulses are separated by a distance long enough to avoid interference but short enough to allow overlapping (≈100 µm), is it possible to print continuous lines in a single step. Finally, the knowledge obtained has allowed the printing of silver lines at high speeds (up to 60 m/s).

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Section: Discussionsupporting

confidence: 90%

Section: Introductionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 67%

See 1 more Smart Citation

Overlapping Limitations for ps-Pulsed LIFT Printing of High Viscosity Metallic Pastes

Muñoz-Martín

Chen

Morales

et al. 2020

Metals

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show abstract

“…As the laser pulse energy increases, both the amount of transferred material and its ejection speed increase. [ 43 ] This allows understanding the increase in width: more material is ejected, and at a higher speed so that when the ink contacts the receiver substrate, the spread is larger.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have proved the feasibility of LIFT for printing liquids with a wide range of viscosities (from 1 to 10 6 mPa s), [ 33–35 ] and suspensions containing large loading particles (up to 30 µm). [ 36–38 ] Thus, SP inks—with high viscosity (>10 Pa s) and usually loaded with large particles (a few micrometers)—can be printed using LIFT, [ 39–43 ] though not through IJP. [ 19,20 ] These rheological properties are compatible with high solid contents, and in the case of conductive inks, they can result in the fabrication of interconnects with sheet resistances as low as 50 mΩ □ −1 , [ 5,44–46 ] much lower than those resulting from IJP (around 1 Ω □ −1 ).…”

Section: Introductionmentioning

confidence: 99%

Laser‐Induced Forward Transfer: A Digital Approach for Printing Devices on Regular Paper

Sopeña

Sieiro

Fernández-Pradas

et al. 2020

Adv Materials Technologies

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Inkjet printing (IJP) is the most widespread direct‐write technique in paper electronics. However, this technique cannot be used for printing devices on untreated regular paper, since its low‐viscosity nanoinks leak through the cellulose fibers. Thus, a planarization coating is frequently used as a barrier, even though this makes substrates more expensive and less eco‐friendly. Alternatively, high solid content screen printing (SP) inks could allow printing on regular paper due to their high viscosity and large particle size; however, they cannot be printed through IJP. Another digital technique is then required: laser‐induced forward transfer (LIFT). This work aims at proving the feasibility of LIFT for printing devices on regular paper. The main transfer parameters are systematically varied to obtain uniform Ag‐SP interconnects, whose performance is improved by a multiple‐printing approach. It results in low resistances with much better performance than those typical of IJP. After optimizing the functionality of the printed lines, a proof‐of‐concept consisting of a radio‐frequency inductor is provided. The characterization of the device shows a substantially higher performance than that of the same device printed with IJP ink in similar conditions, which proves the potential of LIFT for digitally fabricating devices on regular paper.

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Printed Electronics Going 3D – An Overview on Structural Electronics

Schranzhofer

2022

Inkjet Printing in Industry

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Laser-induced forward transfer of conductive screen-printing inks

Cited by 35 publications

References 40 publications

Overlapping Limitations for ps-Pulsed LIFT Printing of High Viscosity Metallic Pastes

Overlapping Limitations for ps-Pulsed LIFT Printing of High Viscosity Metallic Pastes

Laser‐Induced Forward Transfer: A Digital Approach for Printing Devices on Regular Paper

Printed Electronics Going 3D – An Overview on Structural Electronics

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