Atomic-scale silicidation of low resistivity Ni-Si system through in-situ TEM investigation

An Yuan Hou, Yi Hsin Ting, Kuo Lun Tai, Chih Yang Huang, Kuo Chang Lu, Wen Wei Wu

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)


Nickel silicide has many advantages, such as low resistivity and low formation temperature; therefore, it has been widely used in the fields of solar cells, transistors and complementary metal-oxidesemiconductor (CMOS) devices. To obtain high-quality nickel-silicide thin film, solid-state reaction is a convenient and efficient fabrication method. For better understanding of the dynamic formation mechanism, we used in-situ transmission electron microscopy (TEM) to record the diffusion behavior during the heating process. In this work, three-steps annealing process to synthesize different nickel silicides corresponding to the various formation temperatures were investigated systematically. At 250 °C, the product of the first-step annealing was inverted-triangle Ni2Si, embedded in the Si substrate. Then, well-distributed NiSi thin film was synthesized, having the lowest resistivity among Ni-Si system at 400 °C. Finally, NiSi2, a Si-rich product, would form during the third-step annealing at 600 °C. NiSi2 product and Si substrate have small lattice mismatch; thus, the epitaxial relationship would be observed. We provide the evidence of diffusion behaviors and structural identification of Ni-Si system. Furthermore, these results are beneficial for the formation of specific nickel silicides, which is expected to optimize the fabrication of microelectronics.

期刊Applied Surface Science
出版狀態Published - 2021 二月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 凝聚態物理學
  • 物理與天文學 (全部)
  • 表面和介面
  • 表面、塗料和薄膜


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