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Band Gap Measurements of Nano-Meter Sized Rutile Thin Films.

Nikolaos C Diamantopoulos1, Alexandros Barnasas1, Christos S Garoufalis1

  • 1Materials Science Department, University of Patras, 26504 Patras, Greece.

Nanomaterials (Basel, Switzerland)
|December 2, 2020
PubMed
Summary

This study fabricated thin titanium dioxide (TiO2) films, revealing quantum confinement effects. Film thickness influences the band gap, impacting optical properties and supporting theoretical models.

Keywords:
optical propertiespotential morphing methodquantum confinementrutilesemiconductor oxidesthin films

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thin Film Technology

Background:

  • Titanium dioxide (TiO2) is a crucial material with diverse applications.
  • Understanding the optical properties of ultrathin TiO2 films is essential for advanced electronic and photonic devices.
  • Quantum confinement effects in semiconductor nanostructures significantly alter their electronic and optical behavior.

Purpose of the Study:

  • To investigate the structural, optical, and electronic properties of thin rutile TiO2 films.
  • To explore the influence of film thickness on the band gap and absorption characteristics.
  • To confirm the presence of quantum confinement effects in these ultrathin films.

Main Methods:

  • Radio frequency magnetron sputtering for thin film deposition.
  • High-temperature annealing in air to achieve single-phase rutile TiO2.
  • X-ray diffraction (XRD) for structural analysis.
  • Atomic-force microscopy (AFM) for surface morphology and grain size determination.
  • Optical absorption spectroscopy and Tauc plot analysis for band gap determination.
  • Derivative methods for analyzing absorption peaks.
  • Theoretical calculations using effective mass theory and Hartree-Fock approximation.

Main Results:

  • Successfully fabricated single-phase rutile TiO2 films on quartz substrates.
  • Verified high crystalline quality and determined grain size using AFM.
  • Observed a blue shift in the indirect band gap and the first absorption peak with decreasing film thickness.
  • Demonstrated that the indirect band gap of rutile TiO2 is slightly above 3.0-3.2 eV.
  • The first intense absorption peak was observed around 4 eV.

Conclusions:

  • The observed blue shift in optical properties with decreasing film thickness indicates quantum confinement effects in ultrathin TiO2 films.
  • Theoretical calculations support the experimental findings, confirming the influence of quantum confinement.
  • The study provides valuable insights into the size-dependent properties of rutile TiO2 nanostructures.