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Trimethylsilyl Diethylamine (TMSDEA) Silylation Agent

CAS Number: 996-50-9

Trimethylsilyl diethylamine (TMSDEA) is a silylation reagent used in semiconductor lithography to modify photoresist surface chemistry and enhance adhesion. As a surface treatment agent for silylated resist processes (e.g., DESIRE process), it converts OH groups on resist surfaces to OSi(CH3)3 groups, improving etch selectivity. Also used in ALD surface functionalization and low-k dielectric surface repair.

Technical Specifications

appearanceColorless clear liquid
purity (%)≥99.5 (GC assay)
boiling point126°C
water content≤50 ppm
metallic impurities≤1 ppb each

Applications

  • Silylated photoresist surface modification (DESIRE process)
  • ALD surface hydroxyl group functionalization
  • Low-k dielectric surface repair after plasma damage
  • Photoresist adhesion promotion on oxide surfaces
  • Surface passivation for selective area deposition

Key Features

  • High reactivity with surface OH groups for rapid silylation at room temperature
  • Metal-ion-free formulation suitable for CMOS gate dielectric processes
  • Byproduct (diethylamine) is volatile and easily removed by purge
  • Moisture-sensitive; supplied under inert gas in sealed metal containers

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Trimethylsilyl Diethylamine (TMSDEA) Silylation Agent chemical structure

CAS Number

996-50-9

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