Laser sintering of copper nanoparticles

Michael Zenou, Oleg Ermak, Amir Saar, Zvi Kotler

Research output: Contribution to journalArticlepeer-review

136 Scopus citations

Abstract

Copper nanoparticle (NP) inks serve as an attractive potential replacement to silver NP inks in functional printing applications. However their tendency to rapidly oxidize has so far limited their wider use. In this work we have studied the conditions for laser sintering of Cu-NP inks in ambient conditions while avoiding oxidation. We have determined the regime for stable, low-resistivity copper (< ×3 bulk resistivity value) generation in terms of laser irradiance and exposure duration and have indicated the limits on fast processing. The role of pre-drying conditions on sintering outcome has also been studied. A method, based on spectral reflectivity measurements, was used for non-contact monitoring of the sintering process evolution. It also indicates preferred spectral regions for sintering. Finally, we illustrated how selective laser sintering can generate high-quality, fine line (<5 m wide) and dense copper circuits.

Original languageAmerican English
Article number025501
JournalJournal Physics D: Applied Physics
Volume47
Issue number2
DOIs
StatePublished - 15 Jan 2014

Keywords

  • copper nanoparticles
  • laser matter interaction
  • organic LED
  • oxidation
  • sintering

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