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 35.40: Poster

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

Work function measurements of sputtered TiO₂ in UHV ambience — •Sonja Urbahn, Rüdiger M. Schmidt, Alexandera Yatim, and Matthas Wuttig — I. Physikalisches Institut (IA), RWTH Aachen, 52056 Aachen

Titanium Dioxide (TiO₂) is a material with unique properties which have led to various applications such as anti-reflective coatings or self-cleaning surfaces. In particular, self-cleaning is possible by the high photocatalytic activity. However, the underlying process behind this attractive feature is still not understood in sufficient detail.

To improve the understanding of the correlation between the structural features of reactively sputtered TiO₂ with its photocatalytical activity we built a UHV Kelvin probe setup. Since self-cleaning implies the diffusion of photo generated charge carriers to the surface where they react with adsorbates, a change of the photocatalytic activity involves a change of the surface potential and thus of the work function. We show data measured with a Kelvin probe in UHV-ambience and link the behavior under UV illumination with structural properties. Although the Kelvin probe technique is very sensitive to the environment, the setup allows to measure data which show a correlation between the change in the work function under UV illumination and structural properties.