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Aluminum Chloride ALD Precursor (AlCl3)

CAS Number: 7446-70-0

Anhydrous aluminum chloride (AlCl3) is used as an ALD (atomic layer deposition) precursor for depositing Al2O3 high-k dielectric and aluminum-containing thin films in semiconductor devices. In ALD processes, alternating exposures of AlCl3 and water (or ozone) produce conformal Al2O3 films with monolayer-level thickness control, critical for gate dielectrics, capacitor dielectrics, and encapsulation layers.

Technical Specifications

appearanceWhite to pale yellow crystalline powder
purity (%)≥99.999 (5N, anhydrous)
water content≤10 ppm
sublimation point178°C (at 1 atm)
metallic impurities (Fe, Si, Na)≤0.5 ppm each

Applications

  • Al2O3 high-k gate dielectric ALD
  • DRAM capacitor Al2O3 dielectric deposition
  • Encapsulation layer for OLED and flexible electronics
  • Al2O3 etch stop and barrier layer
  • Catalytic surface preparation for selective ALD

Key Features

  • 5N ultra-high purity for defect-free high-k dielectric ALD films
  • High vapor pressure simplifies delivery at moderate temperatures (100–150°C)
  • Produces dense Al2O3 with low interface state density
  • Packaged under inert atmosphere in ampoules for contamination-free delivery

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Aluminum Chloride ALD Precursor (AlCl3) chemical structure

CAS Number

7446-70-0

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