Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.36: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

An explanation for the unusual pattern formation behavior on Ge — •Hans Hofsäss, Omar Bobes, and Kun Zhang — Fakultät für Physik, Universität Göttingen, Göttingen, Germany

Pattern formation on Germanium surfaces due to ion irradiation has been extensively studied experimentally [1,2,3]. Common to these experiments is that the onset of parallel ripple patterns occurs at an unusual large critical angle of incidence of about 60° and only for heavier ions such as Kr and Xe. For Ar and Ne no pattern formation was found for all angles of incidence [1]. This behavior cannot be understood on the basis of the Bradley-Harper and the Carter-Vishnyakov model.

We have carried out experiments, which confirm the above mentioned experimental results. Monte Carlo simulations using the SDTrimSP program were performed to calculate the curvature coefficients using the crater function formalism. We take into account incorporation of noble gas ions and density reduction due to swelling and void formation. We find that pattern formation on Ge surfaces should indeed be absent for keV Ne and Ar ion irradiation and is suppressed for keV Kr and even Xe ions, except for large angles of incidence.

[1] M. Teichmann, J. Lorbeer, B. Ziberi, F. Frost, and B. Rauschenbach, New. J. Phys. 15 (2013) 103029.

[2] J. C. Perkinson, C. S. Madi, and M. J. Aziz, J. Vac. Sci. Technol. A 31 (2013) 021405.

[3] E. Anzenberg, J. C. Perkinson, C. S. Madi, M. J. Aziz, and K. F. Ludwig, Phys. Rev. B 86 (2012) 245412.