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Laser sintering of direct write silver nano-ink conductors for microelectronic applications

Direct Write Technologies are reaching the goal of entirely printable microelectronic devices on flexible polymeric substrates. In the present work, nanoparticle inks deposited on low temperature polyimide substrates using Maskless Mesoscale Material Deposition (M3D®) technology were laser sintered using a continuous wave 1.06 micron Nd:YAG laser. In-situ measurements were made during sintering to capture the dynamic change in bulk resistivity as a function of deposited energy per volume of sintered material. It was shown that less than 0.05-μJ/μm3 started the sintering and 0.34-μJ/μm3 was enough for sintering the deposited samples regardless of initial resistance.