A Study of Ta-Si-N/Ti Bilayer Diffusion Barrier for Copper/Silicon Contact Systems

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Abstract
Ta-Si-N (10 nm)/Ti (20 nm) bilayer film has been designed with the purpose of using as diffusion barrier in copper interconnection. Ta-Si-N/Ti bilayer diffusion barriers were deposited on the substrate of n-type (100) silicon wafer using radio-frequency (RF) magnetron sputtering, followed by in situ deposition of copper. To investigate the thermal stability of the Ta-Si-N/Ti diffusion barriers, annealing was subsequently conducted in N2 gas for 60 min and annealing temperatures were chosen at 600°C, 650°C, 700°C, 750°C, and 800°C. X-ray diffraction (XRD) revealed that Ta-Si-N layer grown on the Ti layer exhibited an amorphous phase. The results indicated that Ta-Si-N/Ti film can prevent copper diffusion at 750°C. After annealing at 750°C, the production of Ti-Si layer can effectively decrease contact resistance between barrier and silicon.
Funding Information
  • the High and New Technology Industry Special Funds of Harbin (2012FG2CG077)
  • the Postdoctoral Sustentation Fund for Heilongjiang Province (LBH-Z12272)
  • Application Technology Research and Development Projects of Heilongjiang Province (GC13A103)

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