Laser Printing of Multilayered Alternately Conducting and Insulating Microstructures

Area of Science:

• Materials Science
• Nanotechnology
• Microfabrication

Background:

• Multilayered microstructures are crucial for microelectronic components.
• Existing fabrication methods (top-down, bottom-up) have limitations.
• Laser-based patterning offers high resolution but hasn't achieved multilayered conducting/insulating structures.

Purpose of the Study:

• To demonstrate a new laser printing method for fabricating multilayered microstructures.
• To create structures with alternating conducting (platinum) and insulating (silicon oxide) layers.
• To explore microfluidics for enhanced multilayered fabrication.

Main Methods:

• Utilized laser printing with thermally driven reactions and microbubble assistance.
• Employed platinum(II) chloride (PtCl2) in N-methyl-2-pyrrolidone (NMP) for platinum layers.
• Used tetraethyl orthosilicate in NMP for silicon oxide layers, confirmed by Raman spectroscopy.

Main Results:

• Successfully fabricated multilayered structures of conducting platinum and insulating silicon oxide.
• Achieved control over insulating layer height (50-250 nm) by adjusting laser power and iterations.
• Measured silicon oxide resistivity at 1.5 × 10^11 Ωm.
• Identified and discarded unsuitable porous/cracking insulating materials.

Conclusions:

• The developed laser printing technique enables the fabrication of multilayered microstructures with conducting and insulating properties.
• Microfluidic integration enhances the process by enabling rapid precursor switching.
• This approach offers a simplified pathway for producing advanced multilayered microelectronic devices.