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KR: Fachgruppe Kristallographie
KR 12: Functional Materials - Analysis with EBSD, X-Ray Kossel Diffraction and Related Methods (MI jointly with KR)
KR 12.5: Vortrag
Donnerstag, 3. April 2014, 10:45–11:00, MER 02
Characterization of 0-3 high permittivity composite capacitors for energy storage — •Jens Glenneberg, Gerald Wagner, Thomas Großmann, Stefan Ebbinghaus, Martin Diestelhorst, Sebastian Lemm, Horst Beige, and Hartmut Leipner — Martin-Luther-Universität Halle-Wittenberg
Energy storage is more than ever an important topic, while thin film capacitors with high energy densities seem to be a promising solution. Their advantages over accumulators are for example quick charging and discharging times, long lifetimes and low manufacturing costs.
Due to its ferroelectric properties and extremely high permittivity, CaCu3Ti4O12 (CCTO) is well suited for the use in short term energy storage. Since pure CCTO exhibits comparatively low breakdown field strength, the device efficiency is limited. To increase the energy densities, CCTO nanoparticles can be embedded in specific inorganic matrices. The size and distribution of the nanoparticles determine the electric properties of the capacitor dielectrics to a very large extent.
To investigate the microstructure, the nanoparticles and the surrounding matrix are imaged by environmental scanning electron microscopy (ESEM) in both secondary electron contrast (SE) and backscattered electron contrast (BSE) as well as by transmission electron microscopy (TEM). To acquire compositional information, additional energy-dispersive X-ray spectroscopy (EDS) has been carried out. With the help of these investigations an assessment to the chemical composition and the microstructure is allowed, which can be seen in context to the resulting electrical properties.