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Related Experiment Video

Updated: Jun 12, 2026

Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
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Multi-Technique Approach for Work Function Exploration of Sc2O3 Thin Films.

Alessio Mezzi1, Eleonora Bolli2, Saulius Kaciulis1

  • 1Institute for the Study of Nanostructured Materials, ISMN-CNR, Montelibretti, 00010 Rome, Italy.

Nanomaterials (Basel, Switzerland)
|April 28, 2023
PubMed
Summary

Non-continuous scandium oxide (Sc₂O₃) thin films are key to reducing work function by forming surface dipoles. Barium fluoride (BaF₂) in multi-layered films does not further decrease work function.

Keywords:
AFMEDXRUPSXPSXRDelectron-beam evaporationscandium oxidework function

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Work function reduction is crucial for advanced electronic devices.
  • Scandium oxide (Sc₂O₃) is a promising material for modifying surface properties.
  • Understanding film morphology's impact on work function is essential.

Purpose of the Study:

  • To investigate the effect of scandium oxide (Sc₂O₃) thin film thickness on work function reduction.
  • To explore the role of film continuity and stoichiometry in work function modification.
  • To assess the influence of barium fluoride (BaF₂) in multi-layered structures.

Main Methods:

  • Deposition of Sc₂O₃ thin films with varying thicknesses (2-50 nm) using electron-beam evaporation.
  • Fabrication of multi-layered Sc₂O₃/BaF₂ films.
  • Characterization using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), energy dispersive X-ray reflectivity (EDXR), atomic force microscopy (AFM), and ultraviolet photoelectron spectroscopy (UPS).

Main Results:

  • Non-continuous Sc₂O₃ films minimize work function, reaching as low as 2.7 eV at room temperature.
  • Surface dipole effects between crystalline islands and silicon substrates are responsible for work function reduction.
  • Stoichiometry (Sc/O = 0.38) deviates from ideal, yet effective work function reduction is achieved.
  • Incorporation of BaF₂ in multi-layered films did not enhance work function reduction.

Conclusions:

  • Optimizing thin film morphology, specifically achieving non-continuous structures, is critical for effective work function reduction.
  • Surface dipole formation is the primary mechanism for work function lowering in these Sc₂O₃ films.
  • Barium fluoride is not beneficial for further work function reduction in Sc₂O₃-based multi-layered systems.