Dresden 2009 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Layer Properties: Electrical, Optical and Mechanical Properties I
DS 17.4: Talk
Wednesday, March 25, 2009, 10:15–10:30, GER 37
Deposition, characterization and biological application of ZnO double-layers — •Angela Vlad1, Sergii Yakunin1, Erich Kolmhofer2, Vikotoriia Kolotovska3, Leila Muresan4, Alois Sonnleitner3, Dieter Bäuerle1, and Johannes Pedarnig1 — 1Institute of Applied Physics, Johannes Kepler University, A-4040 Linz, Austria — 2DICE GmbH & Co KG, Freistädter Straße 400, A-4040 Linz, Austria — 3Center for Biomedical Nanotechnology, Upper Austrian Research GmbH, A-4020 Linz, Austria — 4Department of Knowledge-Based Mathematical Systems, Johannes Kepler University, A-4040 Linz, Austria
Double-layers of Lithium doped ZnO (LZO) and Aluminum doped ZnO (AZO) are grown on r-cut sapphire (r-Al2O3) crystal substrates by pulsed-laser deposition. The epitaxial double-layers are a - axis lattice oriented to the substrate. The LZO / AZO / r-Al2O3 samples have high optical transmission in the visible range and a band-gap energy of Eg = 3.23 eV according to the absorption edge of ZnO. The AZO bottom layers are electrically conductive (resistivity at room temperature ρ = 10−3 Ω cm) and LZO top layers are highly resistive (ρ = 105 Ω cm). Acoustic shear mode resonances in r-Al2O3 are excited by employing electric fields to the piezoelectric LZO layer (frequency interval 1.5 - 3 GHz). For biological applications, madine darby canine kidney cells are cultivated on Platinum coated LZO / AZO / r-Al2O3 samples. Osmotic pressure applied to the cells increases or reduces the cell volume depending on the osmolarity of the medium.