Dr Ingo Munch, Institute for Structural Analysis, Karlsruhe Institute of Technology

Domain engineering of ferroelectric thin films for energy conversion
When Oct 10, 2014
from 02:00 PM to 03:00 PM
Where LR8, IEB Building, Engineering Science
Contact Name
Contact Phone 01865-283488
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We investigate the behaviour of epitaxial sputtered ferroelectric thin films with uniform lattice orientation for the design of nano-generators to convert mechanical into electrical energy. Therefore, we use a phase field model to simulate the domain topology. For the efficiency of the generator, it is

important to consider an appropriate substrate layer to pre-stresses the ferroelectric material. Further, the BaTiO3 film needs a structured field of top electrodes. Both, pre-stress and structured electrodes enforce a domain topology which allows for energy conversion.

Alternating interfacial strain between the substrate and the ferroelectric, e.g. by bending the substrate, leads to alternating domain configurations. Thus, opposite surface charges between the electrodes generate an electric flux. Due to the mechanical cycle load there is need for an electrical circuit to

transform single-phase alternating current into co-current flow. It is essential to store the generated electric energy within an accumulator or capacitor. However, the contact and charge status of the electric storage medium strongly influences the performance of the generator.