Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9829556 | Journal of Crystal Growth | 2005 | 10 Pages |
Abstract
Surface segregation has been a major factor limiting dopant incorporation in silicon and Si1âxGex epitaxy. This paper discusses arsenic incorporation and surface segregation during mixed gas- and solid-source molecular beam epitaxy of silicon and Si1âxGex. The use of Si2H6 gas as the silicon source and careful control of growth conditions enable calculation of the surface arsenic concentration during growth from its effect on the gas-source growth rate. A wide range of surface arsenic concentrations were examined to determine the near-equilibrium relationship between the surface arsenic concentrations and the incorporated arsenic concentrations in the silicon epilayers. A new model based on 2-dimensional islanding of surface arsenic dimers is proposed to explain the observed segregation relationship and the changing surface morphology. The effects of germanium on arsenic surface segregation in Si1âxGex are also discussed qualitatively.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Xian Liu, Qiang Tang, James S. Harris, Theodore I. Kamins,