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Thin Films, Ceramics

A.Univ.Prof. Dr. Johannes David Pedarnig
Radovan Vranik, Christian Kreuzwieser


High temperature superconductors (RE-Ba-Cu-O, RE-Ba-Sr-Cu-O, Bi-Sr-Ca-Cu-O, etc.), nanocomposite oxides (M-2411 / Y-Ba-Cu-O), and transparent conductive oxides (metal doped ZnO) are grown as epitaxial and polycrystalline thin films and multi-layers. Besides, piezoelectrics and ferroelectrics (ZnO, BaTiO3, PZT, etc.) and polymer-based composites are fabricated as thin films.

Thin films are mainly produced by "pulsed-laser deposition" (PLD). The optimisation of the PLD process, the correlation of process parameters with the properties of grown layers, and the synthesis of metastable compounds are investigated. Among the other methods employed for film fabrication are standard and electron-beam evaporation and spin-on techniques. The physical characterization of thin films includes investigations of the surface morphology, crystallinity and texture, micro and nanostructure, and element analysis, and of the dielectric, electrical, superconducting, and optical properties.

The patterning of thin films is performed by photo-lithographic techniques in combination with wet chemical etching and by laser ablation. Nano-patterning of films is performed by masked ion-beam lithography.

Ceramics are synthesized from commercially available precursors and powders are fabricated by different methods (coprecipitation, sol-gel techniques, etc.). These ceramics are used as target materials in PLD, and for fundamental investigations.

High-Tc superconductors & nanocomposite oxides

Transparent conductive oxides

Piezoelectrics & Composite Materials

YBCO (Y-123)
BiSrCaCuO (Bi-2212, etc.)
HgBaCaCuO (Hg-1212, etc.)

Metal doped zinc oxide M:ZnO, with M = Al, Ga

BaTiO3 (BTO),
ZnO, GaPO4

M-2411 / Y-123


PTFE based composites (e.g. BTO as filler)

Transparent conductive oxides on polymer substrates: Pulsed-laser deposition of Al-doped ZnO thin films and application of AZO layers in organic solar cells (Ref: Thin Solid Films, 2015)

Nano-structures in epitaxial YBa2Cu3O7 thin film produced by masked ion beam irradiation.
Darker regions in SEM images are irradiated by He+ ions.