Electroless nickel ternary alloy deposition on SiO2 for application to diffusion barrier layer in copper interconnect technology

Tetsuya Osaka, Nao Takano, Tetsuya Kurokawa, Tomomi Kaneko, Kazuyoshi Ueno


56 被引用数 (Scopus)


Electroless NiWP and NiReP films were investigated with the aim of application to barrier and capping layers in interconnect technology. These alloys containing a refractory metal with a high melting point were expected to have the ability to avoid diffusion of Cu into the interlevel dielectric. The composition and resistivity of these films were investigated first in order to know the relation between the composition and its thermal stability. The thermal stability was investigated by measuring the sheet resistance and the cross-sectional observation with field emission scanning electron microscope. Additionally, an electroless Ni alloy deposition on the SiO2 layer without a sputtered seed layer was also examined by utilizing a self-assembled monolayer (SAM) as an adhesion and catalytic layer. Since an alkaline solution damaged the SiO2 surface, a two-step process, which consists of a nucleation step performed in an acid electroless deposition bath and a barrier layer formation step carried out in an alkaline bath, is employed in order to fabricate a consistently uniform barrier film on the SAM/SiO2 surface. It was found that the NiReP films formed on SAM/SiO2 surfaces were stable up to 400°C, and are feasible for the barrier layer for the Cu interconnect technology.

ジャーナルJournal of the Electrochemical Society
出版ステータスPublished - 2002 11 1

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学


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