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Dichlorosilane CVD Precursor (DCS, SiH2Cl2)

CAS Number: 4109-96-0

Dichlorosilane (DCS, SiH2Cl2) is a widely used CVD precursor for depositing high-quality silicon nitride (Si3N4), silicon oxynitride (SiON), and polysilicon films in LPCVD processes. The DCS/NH3 chemistry at 750–800°C produces stoichiometric Si3N4 films with excellent uniformity and electrical properties for gate spacers, etch stops, and charge-storage layers in DRAM and flash memory.

Technical Specifications

oxygen≤0.5 ppm
moisture≤0.5 ppm
appearanceColorless flammable gas
purity (%)≥99.999 (5N semiconductor grade)
metallic impurities≤0.1 ppb each

Applications

  • LPCVD Si3N4 gate spacer and etch stop
  • DRAM capacitor charge storage nitride
  • SiON gate dielectric (nitrided oxide)
  • Flash memory inter-poly ONO dielectric
  • PECVD silicon nitride passivation layer

Key Features

  • Preferred precursor for stoichiometric LPCVD Si3N4 with low hydrogen content
  • Low deposition temperature versus trichlorosilane reduces thermal budget
  • Excellent within-wafer and wafer-to-wafer uniformity in batch LPCVD furnaces
  • Available in high-pressure cylinders with ultra-high-purity valves and fittings

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Dichlorosilane CVD Precursor (DCS, SiH2Cl2) chemical structure

CAS Number

4109-96-0

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