Improving area-selective molecular layer deposition by selective SAM removal.

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Area-selective molecular layer deposition (MLD) is crucial for creating nanoscale organic patterns.
• Achieving high selectivity, especially with increased MLD cycles, remains a significant challenge.

Purpose of the Study:

• To develop a strategy for high-quality, area-selective film deposition on patterned copper/silicon substrates.
• To improve selectivity in MLD processes for micro- and nanoscale applications.

Main Methods:

• Utilized octadecylphosphonic acid self-assembled monolayers (SAMs) for selective adsorption on copper over silicon.
• Performed MLD to deposit organic films primarily on silicon surfaces.
• Employed electrochemical desorption with a negative potential bias to remove SAMs from copper surfaces.

Main Results:

• Successfully created resist layers selectively on copper using SAMs.
• Achieved preferential MLD film growth on silicon surfaces.
• Enhanced selectivity up to 30-fold through electrochemical desorption of SAMs from copper.

Conclusions:

• The proposed strategy effectively improves selectivity in area-selective MLD.
• This method offers a viable approach for fabricating high-quality patterned organic structures.
• The technique shows promise for advanced micro- and nanoscale fabrication.