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Process Optimization for Metal-Contact Etching in 3D Integration Devices.

Sung Gyu Pyo1

  • 1School of Integrative Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea.

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Summary

This study introduces a novel three-step metal-contact etching process for 3D-integrated circuits. The improved method prevents nitride punch-through, ensuring stable super-contact etching and reliable performance.

Keywords:
3D integrationcontact etchmetal-1 contactsuper-contact

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Area of Science:

  • Materials Science and Engineering
  • Semiconductor Device Fabrication
  • Nanotechnology

Background:

  • Conventional metal-contact etching faces challenges with film-stack configurations and super-contact etching.
  • Evaluating single parameters offers limited insight into the complex interplay between physical profiles and electrical performance.

Purpose of the Study:

  • To comprehensively examine the physical profile characteristics of metal-contact etching and 3D-integrated super-contacts.
  • To develop a stable and reliable super-contact etching methodology for advanced 3D-integrated logic applications.

Main Methods:

  • Investigated a novel metal-contact etching process focusing on film-stack configuration.
  • Implemented a three-step etch sequence with a high-selectivity over-etch for improved stopping margin.
  • Evaluated stopping margin under various conditions, including baseline and high-selectivity scenarios.

Main Results:

  • Initial evaluations showed nitride punch-through under conventional conditions.
  • The three-step etch sequence successfully addressed nitride punch-through.
  • Achieved robust process windows, favorable critical dimension (CD) control, and reliable nitride stopping performance.

Conclusions:

  • The developed three-step etch sequence provides a practical methodology for stable super-contact etching.
  • This approach is suitable for advanced 3D-integrated logic applications.
  • The study highlights the importance of a multi-step approach for optimizing etching processes in complex film stacks.