Physics of the Solid State
Volumes and Issues
Study of Si(100) surface step convergence kinetics
Yesin M.Yu. 1, Deryabin A. S. 1, Kolesnikov A. V. 1, Nikiforov A.I. 1
1Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Email: yesinm@isp.nsc.ru, das@isp.nsc.ru, kolesn@isp.nsc.ru, nikif@isp.nsc.ru

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In this work, the convergence kinetics investigations of the SA- and SB-steps on Si(100) substrates with inclination 0.5o and 0.1o were carried out. Analysis of the time dependence of reflection high-energy electron diffraction (RHEED) intensity was used to establish the growth kinetics character on vicinal Si(100) surfaces. It is shown that, in a Si flow at the growth rate of 0.37 ML/s, the step convergence velocity has a decreasing exponential dependence with the temperature increase. It is determined that the single-domain surface formation velocity increases with an increase in the terrace width on the surface, which may be due to the partial participation of growth due to the formation of two-dimensional islands. Above a temperature of 650oC, the dominant growth mode is due to the step movement and the single-domain surface formation velocity decreases with an increase in the terrace width. Thus, the single-layer step convergence is determined by both the MBE growth conditions and the Si(100) substrate orientation. The convergence of SA- and SB-steps of the Si(100) surface is explained by the slowdown of the step SA-motion, which is associated with complex permeability mechanisms and a kink formation of steps. It is assumed that the reason for the slowdown of the step convergence with increasing temperature is an increase in the kink density at the SA-step, which reduces the step SA-permeability coefficient. Keywords:: Molecular-beam epitaxy, reflection high-energy electron diffraction, surface, terraces, steps, kinks.
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