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Organic Chemistry JoVE (Open Access) Citable · DOI

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

DOI: 10.3791/57103-v
What you'll learn
  • ✓ Synthesize vanadium dioxide thin films using atomic layer deposition on sapphire substrates
  • ✓ Characterize VO2 optical properties across metal-insulator transition temperature
  • ✓ Apply multiple analytical techniques to confirm film crystallinity and surface morphology
  • ✓ Develop temperature-dependent optical models for tunable refractive index materials
Protocol

Thin films (100-1000 Å) of vanadium dioxide (VO2) were created by atomic-layer deposition (ALD) on sapphire substrates. Following this, the optical properties were characterized through the metal-insulator transition of VO2. From the measured optical properties, a model was created to describe the tunable refractive index of VO2.

Difficulty
advanced
Total time
~3–5 days (includes ALD synthesis, annealing, multi-technique characterization)

Steps

1
Deposit amorphous vanadium dioxide by atomic layer deposition

Use ALD to grow thin films (100–1000 Å) of amorphous VO2 on sapphire substrates through sequential precursor pulses and purges.

▶ 00:56
2
Anneal amorphous VO2 films to induce crystallization

Heat annealed samples to promote phase transition from amorphous to crystalline VO2, enabling metal-insulator transition behavior.

▶ 03:06
3
Analyze crystalline structure using Raman spectroscopy

Measure Raman spectra to confirm crystallinity and identify characteristic vibrational modes of VO2.

▶ 04:45
4
Determine elemental composition via X-ray photoelectron spectroscopy

Use XPS to verify vanadium and oxygen stoichiometry and assess oxidation states in the VO2 film.

▶ 05:43
5
Image film surface topography by atomic force microscopy

Perform AFM to measure surface roughness, grain size, and morphological features of crystalline VO2.

▶ 07:31
6
Measure optical properties across metal-insulator transition

Characterize temperature-dependent refractive index and optical response as VO2 transitions between insulating and metallic phases.

▶ 09:06
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