Multi-pulsed white light sintering of printed Cu nanoinks
- Multi-pulsed white light sintering of printed Cu nanoinks
- 한원석; 홍재민; 김학성; 송용원
- IPL; light sintering; nanoink; printed electronics
- Issue Date
- VOL 22, 395705-1-395705-6
- Pulse management of white light to maximize the sintering efficiency of a rapid (msec) and
substrate-protective method, intense pulsed light (IPL), was studied systematically with a
printable Cu nanoink. An excessive pulse energy that induces deleterious defects on the Cu film
along with damage on a plastic substrate was dissipated into multiple sub-pulses while
maintaining a total energy budget over the threshold level for successful Cu sintering. Electrical
properties of the metal layers were analyzed in conjunction with pulse formation factors such as
average energy, pulse duration, peak power and pulse number to determine their respective
effects on IPL sintering. In the quantitative results, the optimized sintering conditions of copper
nanoparticles with a mean diameter of 30 nm and a fixed total irradiated pulse energy of
32 J cm−2 were a pulse number and pulse width of >4 and <3 msec, respectively.
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