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Thermal Dynamics Effects using Pulse-Shaping Laser Sintering of Printed Silver Inks
M Bolduc1, C Trudeau2,3, P Beaupré2
1Institut National d'Optique, 2740 Einstein Street, Québec, QC, G1P 4S4, Canada. martin.bolduc@ino.ca.
Scientific Reports
|January 25, 2018
Summary
Researchers optimized laser sintering for flexible electronics. This advanced technique achieves high conductivity on heat-sensitive polymer substrates in milliseconds, outperforming traditional methods.
Area of Science:
- Materials Science
- Additive Manufacturing
- Nanotechnology
Background:
- Flexible substrates are crucial for printable electronics but are heat-sensitive.
- Conventional sintering methods risk damaging these delicate polymer-based materials.
- Localized sintering is needed to process electronic inks without substrate degradation.
Purpose of the Study:
- To explore dynamic laser-based sintering for conductive silver inks on flexible substrates.
- To optimize laser parameters for high-quality ink treatment while preserving substrate integrity.
- To achieve low sheet resistance comparable to conventional annealing but with significantly reduced processing time.
Main Methods:
- Utilized multiple passes of a pulsed laser, varying pulse train frequencies and energies.
- Implemented time-domain pulse shaping to precisely control laser energy delivery.
- Employed finite element modeling to simulate laser-induced thermal dynamics.
Main Results:
- Achieved sheet resistance values as low as 0.024Ω/□ for conductive silver inks.
- Demonstrated processing times in the millisecond range, drastically reducing fabrication time.
- Validated results through thermal dynamics modeling, confirming substrate integrity preservation.
Conclusions:
- Dynamic laser-based sintering offers a highly effective method for fabricating high-performance flexible electronics.
- Optimized laser parameters and pulse shaping enable precise control over ink properties and thermal effects.
- This approach significantly accelerates the production of printed electronics on sensitive substrates.
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