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Tonkikh, Alexander A.
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document
Effects of ad-atom diffusivity throughout Sb-mediated formation of Ge/Si nanoislands
Abstract
<p>The effect of Sb on the formation of Ge nano islands in Si by means of molecular beam epitaxy is reported. We observe in the Ge/Si(100) system a non-monotonic dependence of the Stranski-Krastanov critical thickness of Ge islands formation on the adsorbed Sb amount. Dome-and hut-shaped Ge islands are replaced with the pyramids, when Ge is deposited on the Sb-covered Si(100) surface. The Sb-mediated conservation of the shape of Ge islands during embedding them in Si is shown. We assume that the decrease of the surface diffusion of Si and Ge ad-atoms causes these effects.</p>