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Thin films

Atomic Layer Deposition of Ga2O3 Thin Films with Nitrogen Annealing Treatment

Strategic Insights

— 1 min read

Recent research on atomic layer deposition (ALD) of Ga2O3 thin films has made significant strides, particularly with the inclusion of nitrogen annealing treatment. A team of scientists from the Chinese Academy of Sciences has published a study that comprehensively investigates the effects of annealing temperature on the crystal structure, chemical composition, defect states, and optical properties of Ga2O3 thin films deposited using ALD. The study, led by Weiwei Cao, found that nitrogen annealing treatment significantly improved the crystallinity and reduced oxygen vacancy in the films, resulting in enhanced optical properties.

Key Takeaways:

  • The researchers successfully deposited 400-oriented polycrystalline Ga2O3 thin films on sapphire (0001) substrates using ALD for the first time.
  • The team found that annealing temperature significantly affected the crystal structure, chemical composition, and optical properties of the Ga2O3 thin films.
  • Nitrogen annealing treatment reduced oxygen vacancy and improved crystallinity, leading to enhanced optical properties.
  • The band gap and energy band alignment of the films increased after nitrogen annealing treatment.
  • The study demonstrated the mechanism of passivation defects in nitrogen annealing using Density Functional Theory (DFT) simulations.
  • The findings provide a comprehensive understanding of the effects of nitrogen annealing treatment on Ga2O3 thin films and offer guidance for the preparation of high-quality thin films for high-performance devices.

Statistics:

  • The researchers deposited Ga2O3 thin films at a temperature range of 600-1200 degrees C in nitrogen (N2) atmosphere.
  • Annealing at 1000 degrees C resulted in the optimum crystallinity and reduced oxygen vacancy.
  • The lattice oxygen ratio (OL/(OL + ONL)) was 80.52% after annealing at 1000 degrees C.
  • The band gap increased from 4.80 to 5.53 eV after nitrogen annealing treatment.
  • The VBM changed from 2.5 to 1.97 eV after nitrogen annealing treatment.

Sources:

  • Effect of Nitrogen Annealing Treatment On the Crystal Structure and Band Alignment of Atomic Layer Deposition Deposited B- Ga 2 o 3. Ceramics International, 2025;51(20):31036-31046.
  • NewsRx. Reports Outline Atomic Layer Deposition Study Findings from Chinese Academy of Sciences (Effect of Nitrogen Annealing Treatment On the Crystal Structure and Band Alignment of Atomic Layer Deposition Deposited B- Ga 2 o 3 ). Nanotechnology Weekly. October 20, 2025; p 2982.

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