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Abnormal Silicon Etching Behaviors in Nanometer-Sized Channels
Kunmo Koo1, Joon Ha Chang1, Sanghyeon Ji1
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Nano Letters
|April 1, 2024
Summary
Wet etching of nanoscale silicon is difficult due to unique physical and chemical constraints. This study reveals suppressed reactions and stochastic behaviors, offering insights into semiconductor fabrication challenges.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Semiconductor fabrication faces challenges with nanoscale wet etching of dummy gates.
- Existing theories on etching suppression mechanisms lack direct observational evidence.
Purpose of the Study:
- Investigate the limiting factors of silicon etching kinetics at the nanoscale using tetramethylammonium hydroxide.
- Provide a comprehensive understanding of scale-dependent fabrication constraints.
Main Methods:
- Liquid-phase transmission electron microscopy (LP-TEM)
- Three-dimensional electron tomography
- First-principles calculations
Main Results:
- Observed suppressed chemical reactions at the nanoscale.
- Identified unstripping phenomena and stochastic etching behaviors.
- Demonstrated scale-dependent differences compared to macroscopic etching.
Conclusions:
- Direct observation reveals novel nanoscale etching phenomena.
- Understanding these scale-dependent factors is crucial for advancing semiconductor fabrication.
- Insights pave the way for developing improved fabrication solutions.
