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Surfactant-mediated Stranski–Krastanov islands

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Corresponding author: e-mail: tonkikh@mpi-halle.mpg.de Phone: +49 345 5582643, Fax: +49 345 5511223

e-mail werner@mpi-halle.mpg.de Phone: +49 345 5582629, Fax: +49 345 5511223

Abstract

A criterion for the growth of Stranski–Krastanov islands mediated by surfactants is obtained. It involves that surfactants decrease the island nucleation barrier. Thereby, at a low coverage (θ ≪ 1 mono layer) surfactants facilitate islands formation. At a high coverage (θ ≈ 1 mono layer) the islands growth might be still facilitated, but also hampered under special conditions. The latter is caused by the reduction of the ad-atom surface diffusion. We report on a non-monotonic dependence of Ge/Si(100) island array density on the Sb coverage and discuss it in the frame of the obtained criterion.

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