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Spontaneous N incorporation onto a Si(100) surface
1Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea.
Physical Review Letters
|April 12, 2003
Summary
Nitrogen atoms spontaneously form stable silicon nitride species on Si(100) surfaces at room temperature. This study reveals subsurface incorporation and unique bonding, crucial for understanding silicon nitride film formation.
Area of Science:
- Surface Science
- Materials Chemistry
- Computational Materials Science
Background:
- Understanding initial silicon nitride formation is key for semiconductor technology.
- The behavior of nitrogen on Si(100) surfaces influences thin film properties.
- Previous studies lacked detailed atomistic insights into early-stage nitridation.
Purpose of the Study:
- To investigate the initial nitridation of the Si(100) surface.
- To elucidate the atomic structure and bonding of nitrogen species on silicon.
- To clarify the mechanism of initial silicon nitride formation.
Main Methods:
- Photoemission spectroscopy
- Ion scattering spectroscopy
- Ab initio calculations
Main Results:
- Nitrogen atoms spontaneously form stable N[triple bond]Si(3) species on Si(100) at room temperature.
- The majority of nitrogen incorporates into subsurface interstitial sites.
- Ab initio calculations reveal the atomic structure and bonding mechanism of subsurface nitrogen.
Conclusions:
- The study clarifies the atomistic mechanism of initial silicon nitride formation.
- Unusual subsurface incorporation of nitrogen is identified.
- Findings have implications for N-rich layer formation at SiOxNy/Si interfaces.