DTU Studieprojekt - Textured BiFeO3 piezoelectric thin films on flexible metal substrates for energy harvesting applications

Textured BiFeO3 piezoelectric thin films on flexible metal substrates for energy harvesting applications

Udbyder
Vejleder
Sted
København og omegn
Background
BiFeO3 is one of the most promising piezoelectric materials for replacing the presently used lead-based piezoelectric compounds, which must be phased out due to environmental issues linked to the use of lead. Preferential orientation of the BiFeO3 crystallites is a key microstructural parameter for performance optimization. Highly oriented BiFeO3 films can be manufactured on substrates such as Pt/MgO, Pt/Ti/SiO2/Si etc. However, these substrates are not only expensive, but they cannot be bent, while applications of piezoelectric films in e.g. energy harvesters, would benefit from the use of a flexible substrate. Using metal substrates, in which a preferential crystallographic orientation has been engineered could be a very valuable alternative, not only because they are flexible, but also due to their cost that is 2 orders of magnitude lower than that of standard oriented Pt-lined substrates. BiFeO3 can unfortunately not be directly coated on cube textured Ni-based metal foils due to the need for a minimum of 1000 ppm O2 in the reaction atmosphere for stabilizing the BiFeO3 phase. A possible solution would be to protect the metallic substrate by first applying a protective, electrically conductive LaNiO3 thin layer and to deposit the BiFeO3 film on top of it. The goal of this project is to manufacture a Ni-W/ LaNiO3/BiFeO3 stack with high preferential crystallographic orientation of the BiFeO3 film, by using chemical solution deposition techniques. The microstructure and to piezoelectric response will also be characterized using various experimental techniques.

During this project you are going to:
-Manufacture LaNiO3 and BiFeO3 films on cube textured Ni-W metal substrates using a chemical solution deposition technique.

-Conduct characterization of your samples by means of X-ray diffraction, optical and electron microscopy, as well as energy dispersive spectroscopy.

-Measure the piezoelectric response of your films to evaluate their potential for energy harvesting applications.

-Analyze your results using theoretical models and compare them with published data.

Learning objectives:
At the end of this project you will be able to:

-Explain the principles of piezoelectricity and of its potential application for energy harvesting.

-Develop a chemical solution deposition technique for making functional oxide thin films.

-Use various experimental characterization tools (X-ray diffraction, electron microscopy, thermal analysis, spectroscopy) and explain their basic principles as well as limitations.

-Critically evaluate your results.

-Draw links between processing parameters, microstructure and performance.

-Perform an efficient literature search and compare your own results to published data.

-Present your results to a scientific audience under conditions equivalent to an international conference.

-Write the draft of a scientific publication.

Contact: Jean-Claude Grivel (jean@dtu.dk) – DTU Energy, building 301 (from 11/2019)

Emneord

• Energi
• Bioenergi
• Brændselsceller
• Elforsyning
• Energieffektivisering
• Energilagring
• Energiproduktion
• Energisystemer
• Kraftværker
• Solenergi
• Vindenergi
• Klimatilpasning

Navn
Jean-Claude Grivel

Stilling
Seniorforsker

Mail
jean@dtu.dk

Vejleder-info
Kandidatuddannelsen i Bæredygtig Energi
Vejleder
Jean-Claude Grivel

ECTS-point
30

Type
Kandidatspeciale