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Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium
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Substrate Activated Conformal Deposition Through Interfacial Control by a Soft Energy Intensification Process for

Alain E Kaloyeros1, Barry Arkles1,2

  • 1Kalark Nanostructure Sciences Inc., 3805 Old Easton Road, Doylestown, Pennsylvania 18902, United States.

ACS Omega
|June 16, 2025
PubMed
Summary
This summary is machine-generated.

We developed a sustainable, low-temperature vapor deposition process for atomic-level film control. This method enhances growth rates and enables deposition on fragile substrates, crucial for advanced electronics.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Thin Film Deposition

Background:

  • Traditional vapor deposition methods often require high temperatures and energy.
  • Controlling interfaces at the atomic level is critical for advanced material properties.
  • Existing processes can be limited by substrate fragility and conformal coating challenges.

Purpose of the Study:

  • To demonstrate a soft energy vapor deposition process with atomic-level interface control.
  • To achieve enhanced environmental sustainability and reduced energy consumption in film deposition.
  • To enable deposition on thermally or electrically fragile substrates.

Main Methods:

  • Utilized a 'substrate surface activated' process with low substrate temperature for selective ligand removal.
  • Employed a soft plasma (ion energies < 5 eV, power density < 0.05 W/cm²) to complete monolayer formation.
  • Grew cobalt (Co) and silicon nitride (SiN) thin films using cobalt tricarbonyl nitrosyl and TICZ precursors, respectively.

Main Results:

  • Achieved immediate film nucleation and eliminated incubation periods through effective interfacial treatment.
  • Produced stoichiometric Si3N4 and contaminant-free Co thin films, confirmed by XPS.
  • Demonstrated conformality on aggressive topographies and enhanced growth rate per cycle.
  • Verified atomic-level control of precursor-substrate interactions and decomposition pathways via in situ ellipsometry.

Conclusions:

  • The soft energy vapor deposition process offers precise atomic-level control of interfaces.
  • This low-temperature method is environmentally sustainable, energy-efficient, and compatible with delicate substrates.
  • The technique provides a pathway for improved thin film fabrication in microelectronics and other applications.