Screen printing of silver nanoparticle suspension for metal interconnects

Abstract

Silver nanoparticle suspensions were synthesized by chemical reduction method using a formaldehyde reductant. Polyvinyl pyrrolidone (PVP) of two different molecular weights (M.W.=8,000 and 29,000) was used as a stabilizer for the suspensions. PVP of a smaller molecular weight could produce silver suspensions of nanoparticle size around 20 nm. Water-based conductive silver inks with different silver concentrations were prepared and tested for suitability for screen printing. We have successfully printed silver metal lines on glass substrates using a 400 mesh screen-mask with 60wt.% silver ink prepared in this study. Curing at a low temperature of 200 o C for an hour was found sufficient to reach the lowest resistivity value with the synthesized ink. For a line with a width and thickness of 0.5 mm and 2.12 μm, respectively, it exhibited a resistivity of 3.3×10 −5 Ω·cm, which could serve as conducting lines for various electronic applications.

Laser Direct Writing of Heteroatom (N and S)‐Doped Graphene from a Polybenzimidazole Ink Donor on Polyethylene Terephthalate Polymer and Glass Substrates

“…The printed ink tracks can reach 13 mΩ sq −1 at 85% optical transmittance, and the metal nanofibers can reach 1.3 ± 0.2 Ω sq −1 at 90% optical transmittance . Silver nanoparticles have been shown to give similar resistivity at about 4 µm ink thickness . However, the synthesis and purification of monodispersed nanoparticles would increase the cost of Ag‐based conducting inks by 3–4 times.…”

Optically-controlled digital electrodeposition of thin-film metals for fabrication of nano-devices

“…Direct patterning methods based on metal nanoparticle inks-such as screen printing [1][2][3], micro-contact printing [4,5], nanoimprinting [6,7], inkjet printing [8][9][10], laser-induced printing [11][12][13], and electrodeposition patterning [14][15][16] have been found to be particularly useful in fabricating electrically conductive, micro-scale structures on a substrate. However, each of these methods has its own limitations.…”

Silver content effect on rheological and electrical properties of silver pastes

“…Thus, such methods cannot be applied to brittle surface and weak chemically resistant substrates because of process steps [1]. Screen printing can be used for many electronic applications such as electronic circuits, chemical sensor, fuel cells printing, and organic thin film transistors manufacturing [2,3,4,5].…”

“…In order to reduce solvents impact on environment and thus decrease VOC (Volatile Organic Component) emission, Datta et al [11] prepared low VOC UV-curable silver adhesive by mixing acrylate monomers and radical initiator to flake and sphere shape silver particles. To the best of our knowledge, up to date, water-based silver pastes were only prepared by Yin et al [4] who suspended 20-60% silver nanoparticles by weight in water/ ethylene glycol mixture.…”