Abstract
The dependence of substitutional C fraction on growth temperature and substrate orientation is measured for Si1-yCy. alloy films grown on (001) and (118) Si by molecular-beam epitaxy. Secondary ion mass spectrometry and high-resolution x-ray diffraction were used to measure the total C and the substitutional C concentrations, respectively, in several samples prepared at temperatures between 450 and 650°C. The substitutional C fraction decreased rapidly with increasing temperature in this range, regardless of orientation, and was slightly lower for growth on (118) Si. Cross-sectional transmission electron microscopy on (118)-oriented samples revealed a tendency for C to concentrate periodically on (001) facets which formed immediately after initiation of Si1-yCy growth. A kinetic Monte Carlo simulation based upon enhanced diffusion of Si dimers in the presence of subsurface C predicted a step instability leading to step bunching and the formation of periodic surface features, as well as the accumulation of high C concentrations on nearly (001) planes.
Original language | English (US) |
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Pages (from-to) | 1310-1312 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 77 |
Issue number | 9 |
DOIs | |
State | Published - Aug 28 2000 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)