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DF: Fachverband Dielektrische Festkörper

DF 1: Tutorial “Basics of Dielectric Solids”

DF 1.3: Tutorium

Sonntag, 25. März 2007, 16:00–17:00, H11

Nanoscale dielectrics: Preparation, microstructure, properties — •Dietrich Hesse and Marin Alexe — Max Planck Institute of Microstructure Physics Halle, Germany

Nanoscale dielectrics, i.e. thin films, multilayers, and artificial superlattices of individual layer thicknesses in the sub-100 nm range, and small dielectric objects laterally structurized down to sub-100 nm lateral dimensions (e.g. nanowires and nanotubes, or regular arrays of nanostructures) are in the center of research due to their interesting properties, which are relevant under both fundamental and application aspects. Due to the large interface-to-volume ratio in such nanoscale structures, the properties of nanoscale dielectrics are particularly sensitive to the preparation method, and also to microstructural details like lattice defects. Thus interrelations between preparation, microstructure, and properties need particular attention and are currently a subject of intensive research. Relations of this type will be highlighted on the example of various dielectric, in particular ferroelectric, nanostructures and nano-objects, like pulsed-laser deposited thin films, superlattices, and nanostructure arrays, epitaxial nano-islands grown by chemical solution deposition, and ferroelectric nanotubes prepared using negative or positive templates. The role of interfaces and lattice defects for the properties, possible origins of ferroelectric size and imprint effects, and the influence of the crystallographic orientation will be demonstrated. The problem of distinguishing between intrinsic (material-related) and extrinsic (defect- and microstructure-related) properties of nanoscale dielectrics will be discussed.