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• W2079894790 endingPage "2210" @default.
• W2079894790 startingPage "2199" @default.
• W2079894790 abstract "The evolution of surface roughness in epitaxial Si0.7Ge0.3 alloys grown on Si(001) as a function of temperature (200–600 °C), thickness (t=7.5–100 nm), and substrate miscut were investigated by atomic force microscopy and quantified in terms of the height-difference correlation function G(ρ), in which ρ is lateral distance and [G(ρ→∞)]1/2 is proportional to the surface width. The films were deposited by ultrahigh vacuum ion-beam sputter deposition at 0.1 nm s−1. Strain-induced surface roughening was found to dominate in alloys grown on singular Si(001) substrates at Ts≳450 °C where [G(ρ→∞)]1/2 initially increases with increasing t through the formation of coherent islanding. The islands are preferentially bounded along 〈100〉 directions and exhibit 105 faceting. This tendency is enhanced, with much better developed 〈100〉 islands separated by deep trenches—of interest for growth of self-assembled nanostructures—in films grown on Si(001)-4°[100]. Increasing the film thickness above critical values for strain relaxation leads to island coalescence and surface smoothening. At very low growth temperatures (Ts≤250 °C), film surfaces roughen kinetically, due to limited adatom diffusivity, but at far lower rates than in the higher-temperature strain-induced regime. Si0.7Ge0.3 alloy surfaces are smoother, while the films exhibit larger critical epitaxial thicknesses, than those of pure Si films grown in this temperature regime. There is an intermediate growth temperature range, however, over which the alloy film surfaces remain extremely smooth even at thicknesses near critical values for strain relaxation. This latter result is of potential importance for device fabrication." @default.
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• W2079894790 date "1996-08-15" @default.
• W2079894790 modified "2023-10-01" @default.
• W2079894790 title "Evolution of surface roughness in epitaxial Si_0.7Ge_0.3(001) as a function of growth temperature (200–600 °C) and Si(001) substrate miscut" @default.
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• W2079894790 doi "https://doi.org/10.1063/1.363113" @default.
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