Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
69 (1996), S. 67-69
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A delta-function-shaped Sb doping spike in Si is prepared by deposition of Sb on Si(001) followed by low-temperature molecular beam epitaxy of Si. The depth profile of the Sb atoms is measured using high-resolution Rutherford backscattering spectroscopy, yielding a depth resolution of 0.3 nm. The observed profile shows two peaks corresponding to the δ-doped layer (of width 0.5 nm) and Sb atoms on the surface. The latter are due to surface segregation of Sb atoms during the growth of the Si cap layer. The surface segregation rate is derived from the observed results at temperatures 70–280 °C. It is larger than the value extrapolated from high-temperature ((approximately-greater-than)400 °C) data by several orders of magnitude and shows a very weak temperature dependence as compared to the high-temperature data. These features indicate a new surface segregation mechanism at low temperature. A mechanism for this anomalous segregation is discussed. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.118121
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