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Dangling bond dynamics on the silicon (100)-2x1 surface: dissociation, diffusion, and recombination
McEllistrem1, Allgeier, Boland
1Venable and Kenan Laboratories, Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599-3290, USA.
Science (New York, N.Y.)
|January 28, 1998
Summary
Dangling bond diffusion on silicon surfaces was studied. At higher temperatures, these bonds move along rows and recombine, impacting low-temperature materials growth.
Area of Science:
- Surface science
- Materials science
- Condensed matter physics
Background:
- Deuterium desorption from silicon surfaces creates dangling bonds (DBs).
- The behavior of these DBs influences surface properties and potential applications.
Purpose of the Study:
- To investigate the diffusion dynamics of dangling bonds (DBs) after deuterium desorption from a silicon (100)-2x1 surface.
- To understand the temperature-dependent behavior and recombination mechanisms of DBs.
Main Methods:
- Studying deuterium desorption from silicon (100)-2x1 surfaces.
- Observing dangling bond (DB) configurations and movements at various temperatures using surface science techniques.
Main Results:
- Paired DBs unpaired as deuterium atoms desorbed.
- Below 620 K, unpaired DBs commonly formed on adjacent silicon dimers.
- Above 620 K, unpaired DBs exhibited 1D diffusion along dimer rows, with recombination observed.
- At temperatures above 660 K, complete dissociation and partner exchange recombination occurred.
Conclusions:
- Dangling bond diffusion is temperature-dependent, involving 1D walks and recombination.
- Understanding DB dynamics is crucial for controlling surface processes in low-temperature materials growth.