Mechanisms determining three-dimensional SiGe lsland density on Si(001)
| Autor: | J. S. Sullivan, M. R. Wilson, H. Evans, Max G. Lagally, Donald E. Savage |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Number density Condensed matter physics Nucleation Activation energy Substrate (electronics) Condensed Matter Physics Electronic Optical and Magnetic Materials Crystallography Stranski–Krastanov growth Materials Chemistry Growth rate Electrical and Electronic Engineering Diffusion (business) Wetting layer |
| Zdroj: | Journal of Electronic Materials. 28:426-431 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-999-0090-2 |
| Popis: | Thin, coherently strained, films of SiGe were deposited on Si(001) in the Stranski-Krastanow (SK) growth mode to form small, faceted, dislocation-free-three-dimensional (3D) islands. The number density of these islands was determined as functions of SiGe alloy composition, growth rate, and substrate temperature during growth. From these experiments, the classical model of 3D island nucleation and growth yields an approximate activation energy for diffusion of Ge dimers on a Ge covered Si(001) surface of 0.70 eV. The dependence of the 3D-island number density on growth rate cannot be understood without modifying the classical model to account for the wetting layer present in SK systems. Heteroepitaxial strain is not included in the classical model of island nucleation and growth. A simple linear elastic model that fits the data is developed that predicts the island number density is proportional to the inverse square of the Ge mole fraction in the alloy plus a constant. |
| Databáze: | OpenAIRE |
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