Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials

DS 35.57: Poster

Wednesday, April 2, 2014, 17:00–20:00, P1

Self-organized nanopatterns on carbide surfaces by low energy ion irradiation with metal surfactants — •Omar Bobes, Kun Zhang, and Hans Hofsäss — II. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

We investigate the ripple pattern formation on tetrahedral amorphous carbon (ta-C) films during normal incidence ion beam erosion under simultaneous deposition of different metallic co-deposited surfactant atoms. We have irradiated ta-C films using 1 keV Ar ions under continuous deposition of titanium, tungsten, Molybdenum and Platinum surfactants. The co-deposition of small amounts of Ti, W and Mo leads to the steady state formation of a TiC, WC or MoC nanocomposite surface layer of few nm thickness. This has a tremendous impact on the evolution of nanoscale surface patterns on ta-C. While the surface keeps always flat under co-deposition of Pt-atoms, where there is no possibility for phase separation, ripple pattern are observed under co-deposition of Ti-atoms. The results confirm that the phase separation is the major driving force for the pattern formation in the case of irradiation with normal incident beam.