Self-Correcting Process for High Quality Patterning by Atomic Layer Deposition.

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Nanoscale patterning is crucial for advanced device fabrication.
• Area selective atomic layer deposition (ALD) offers precise thickness control but struggles with selectivity for thicker films.
• Existing methods face limitations in achieving high selectivity with increased ALD cycles.

Purpose of the Study:

• To develop an improved area selective ALD process for enhanced film deposition selectivity.
• To overcome the limitations of current ALD techniques in producing thicker, highly selective patterned films.
• To demonstrate a self-correcting strategy for nanoscale material patterning.

Main Methods:

• Utilized octadecylphosphonic acid self-assembled monolayers for selective surface passivation on copper over silicon dioxide.
• Applied atomic layer deposition (ALD) to deposit dielectric films on patterned substrates.
• Employed a mild etching step to remove non-selectively deposited dielectric films, enhancing pattern fidelity.

Main Results:

• Achieved highly selective dielectric film deposition on patterned Cu/SiO2 substrates.
• Demonstrated a self-correcting process that significantly improves film selectivity.
• Observed a tenfold increase in selectivity compared to conventional area selective ALD after the etching step.

Conclusions:

• The developed self-correcting strategy effectively enhances area selective ALD performance.
• This method provides a viable solution for fabricating thicker, precisely patterned dielectric films.
• The improved selectivity opens new possibilities for nanoscale device applications requiring high-resolution patterning.