Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Investigation on the Effect of Corrosion Inhibitor on Removal Rate and Surface Characteristic of Cobalt Chemical Mechanical Polishing

부식 방지제에 따른 코발트의 화학 기계적 연마 특성 및 표면 분석

  • Eun Su Jung (School of Integrative Engineering, Chung-Ang University) ;
  • Sung Gyu Pyo (School of Integrative Engineering, Chung-Ang University)
  • 정은수 (중앙대학교 융합공학부) ;
  • 표성규 (중앙대학교 융합공학부)
  • Received : 2024.04.16
  • Accepted : 2024.04.19
  • Published : 2024.06.30
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Abstract

As the trend towards miniaturization in semiconductor integration process, the limitations of interconnection metals such as copper, tungsten have become apparent, prompting research into the emergence of new materials like cobalt and emphasizing the importance of studying the corresponding process conditions. During the chemical mechanical polishing (CMP) process, corrosion inhibitors are added to the slurry, forming passivation layers on the cobalt surface, thereby playing a crucial role in controlling the dissolution rate of the metal surface, enhancing both removal rate and selectivity. This review investigates the understanding of the cobalt polishing process and examines the characteristics and behavior of corrosion inhibitors, a type of slurry additive, on the cobalt surface. Among the corrosion inhibitors examined, benzotriazole (BTA), 1,2,4-triazole (TAZ), and potassium oleate (PO) all improved surface characteristics through their interaction with cobalt. These findings provide important guidelines for selecting corrosion inhibitors to optimize CMP processes for cobalt-based semiconductor materials. Future research should explore combinations of various corrosion inhibitors and the development of new compounds to further enhance the efficiency of semiconductor processes.

Keywords

References

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