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Surface Diffusion Control Enables Tailored-Aspect-Ratio Nanostructures in Area-Selective Atomic Layer Deposition.

Philip Klement1, Daniel Anders1, Lukas Gümbel1

  • 1Institute of Experimental Physics I and Center for Materials Research (ZfM/LaMa), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, Giessen D-35392, Germany.

ACS Applied Materials & Interfaces
|April 15, 2021
PubMed
Summary

Area-selective atomic layer deposition (ALD) precisely controls material growth on substrates. This study demonstrates manipulating surface diffusion to enhance selectivity and tailor nanostructures, overcoming previous limitations in microelectronics fabrication.

Keywords:
area-selective depositionatomic layer deposition (ALD)nanofabricationself-aligned fabricationsurface diffusion

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Area-selective atomic layer deposition (ALD) is crucial for microelectronics, enabling targeted material deposition.
  • Current methods struggle with maintaining selectivity over time, leading to errors.
  • Surface modifications typically control precursor adsorption for selectivity.

Purpose of the Study:

  • To investigate the role of surface diffusion in area-selective ALD.
  • To demonstrate precise control over nanostructure formation through diffusion manipulation.
  • To identify and mitigate mechanisms causing loss of selectivity.

Main Methods:

  • Utilized area-selective deposition of TiO2 on poly(methyl methacrylate) and SiO2.
  • Employed surface modifications to influence precursor diffusion.
  • Performed Kinetic Monte-Carlo simulations to model species movement.
  • Analyzed reaction mechanisms, including catalytic activity of TiCl4.

Main Results:

  • Demonstrated that surface modifications significantly alter surface diffusion.
  • Achieved localized nanostructures with tunable aspect ratios via controlled diffusion.
  • Identified catalytic activity of TiCl4 on poly(methyl methacrylate) as a cause for selectivity loss.
  • Showed process optimization enhances selectivity.

Conclusions:

  • Surface diffusion is a key factor for controlling area-selective ALD.
  • Precise nanoscale control of deposition is achievable by exploiting diffusion effects.
  • This work offers new strategies for advanced area-selective deposition processes.