am404581b_si_001.pdf (1.12 MB)
Direct Intense Pulsed Light Sintering of Inkjet-Printed Copper Oxide Layers within Six Milliseconds
journal contribution
posted on 2014-02-12, 00:00 authored by Hyunkyoo Kang, Enrico Sowade, Reinhard R. BaumannWe
demonstrate intense pulsed light (IPL) sintering of inkjet-printed
CuO layers on a primer-coated porous PET substrate to convert the
electrically insulating CuO into conductive Cu. With this approach,
conductive layers are obtained in less than 1 s after the printing
process. The IPL sintering was performed for high productivity with
minimum duration and repetition of IPL irradiation to evaluate the
effect of pulse number and energy output on the conductivity and morphology
of the sintered Cu layers. Depending on the energy output, sheet resistances
were measured as 0.355, 0.131, and 0.121 Ω·□–1 by exposure energy of 5.48 (single pulse), 7.03 (double
pulse), and 7.48 J·cm–2 (triple pulse), respectively.
In contrast, an excessive energy with relatively short pulse duration
causes a delamination of the Cu layer. The lowest resistivity of about
55.4 nΩ·m (corresponds to about 30% conductivity of bulk
Cu) was obtained by an IPL sintering process of 0.26 s after the printing,
which was composed of 2 ms triple pulses with 10 Hz frequency.