Suppression of high-resistance phases of Ni silicide by Se passivation of Si(100)

Janadass Shanmugam, Jinggang Zhu, Yuqing Xu, Wiley P. Kirk, Meng Tao

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


High-resistance phases of Ni-rich Ni silicide are formed on Si(100) below 400 °C, while high-resistance phases of Si-rich Ni silicide are formed above 600 °C. The desired low-resistance NiSi is formed between 400 °C and 600 °C. In this paper, the authors report the suppression of high-resistance phases of Ni silicide by passivating the Si(100) surface with a monolayer of Se. A 500-̊A Ni on n-type low 1015 cm-3 doped Si(100) wafers, passivated with Se, shows a sheet resistance of ∼ 2.55 Ω/square upon annealing between 200 °C and 500 °C, while the sheet resistance of the 500-̊A Ni on identical wafers without Se-passivation jumps to ∼ 7.92 Ω/square between 300 °C and 350 °C. Between 600 °C and 700 °C, the sheet resistance of the Se-passivated samples is ∼ 10% lower than that of the control samples. Transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy all confirm that the suppression of high-resistance Ni silicides below 500 °C is attributed to the suppression of silicidation and above 600 °C to the delay in Si-rich Ni silicide formation at the Ni/Se-passivated Si(100) interface.

Original languageEnglish (US)
Pages (from-to)719-723
Number of pages5
JournalIEEE Transactions on Electron Devices
Issue number4
StatePublished - Apr 2006
Externally publishedYes


  • Integrated circuit metallization
  • Nickel compounds
  • Semiconductor-metal interfaces
  • Surface treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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