DTU Studieprojekt - Textured (KNa)NbO3 piezoelectric thin films on flexible metal substrates for energy harvesting applications

Textured (KNa)NbO3 piezoelectric thin films on flexible metal substrates for energy harvesting applications

Udbyder
Vejleder
Sted
København og omegn
Background
Owing to its high Curie temperature, biocompatibility, high dielectric and piezoelectric properties, (K,Na)NbO3 (KNN) is a promising material for replacing lead-based piezoelectric compounds. Preferential orientation of the KNN crystallites is a key microstructural parameter for performance optimization. Highly oriented KNN films have already been demonstrated 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. We recently demonstrated that KNN films can be grown by chemical solution deposition directly on top of flexible Ni-W metal foils and that the cube texture present in the foil can be transmitted to the KNN film. The piezoelectric performance of the KNN films was however not good due to non-complete coverage of the substrate, which resulted in short-circuit between the top and bottom electrodes The goal of this project is to manufacture oriented KNN films with improved microstructure on cube textured Ni-W metal substrates, characterize their microstructure and to measure their piezoelectric response.

During this project you are going to:
-Manufacture (K,Na)NbO3 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.

-Use 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)

Kontakt
Virksomhed/organisation
DTU Energi

Navn
Jean-Claude Grivel

Stilling
Seniorforsker

Mail
jean@dtu.dk

Vejleder-info
Bachelor i General Engineering
Vejleder
Jean-Claude Grivel

ECTS-point
15 - 20

Type
Bachelorprojekt