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Abstract
The field of complex oxides is at the forefront of material science innovation, driven by the continuous refinement and integration of both emerging and established concepts. This thesis focuses on two main research topics: (i) defect-associated color centers and (ii) the development of freestanding functional oxide membranes.
Color centers are defects within the crystal lattice of materials that can emit light (photoluminescence) and, in ideal conditions, serve as optical spin defects useful for energy-efficient quantum sensing applications. These defects are at the forefront of efforts to develop quantum technologies accessible to society. In this research, the focus is on the generation of optical defects in strontium titanate (SrTiO3), explored induced by ion implantation and characterized by their photoluminescence properties.
Freestanding oxide membranes represent a next-generation materials platform, offering additional degrees of freedom that not only enhance existing functionalities but also enable emergent phenomena that are unattainable in their bulk counterparts. Developing these membranes requires a thorough understanding of growth techniques and the dynamics involved in producing high-quality, single-crystalline oxide thin films. Specifically, this thesis details the optimization of thin film growth and fabrication processes to create high-quality, single-crystalline freestanding functional membranes of SrTiO3 and La0.7Sr0.3MnO3. Additionally, this thesis presents the experimental development of strain engineering of these freestanding oxide membranes on flexible substrates, laying the foundation for practical applications in future flexible electronic devices.
The chapters of this thesis highlight various aspects of complex oxide development toward novel applications:
Chapter 1: The theory behind the utilized and studied concepts in complex oxides is detailed.
Chapter 2: Details of the relevant experimental techniques used in this thesis are provided and explained.
Chapter 3: Ion implantation is explored as a method to develop photoluminescent color centers in SrTiO3.
Chapter 4: The optimization of epitaxial thin film growth on La0.7Sr0.3MnO3/Sr3Al2O6 heterostructures is presented.
Chapter 5: The optimized water-assisted fabrication processes for high-quality single-crystalline La0.7Sr0.3MnO3 and SrTiO3 membranes is presented in conjunction with film growth parameters such as oxygen partial pressure and water-soluble sacrificial layer thickness.
Chapter 6: Strain engineering of oxide membranes is investigated on flexible substrates featuring various metal coatings and differing membrane thicknesses.
Chapter 7: Conclusions based on the thesis research are presented, and perspectives on the future of the investigated material systems are discussed.
The aspects examined and described in this thesis represent only a subset of the broader topics within the field. Numerous opportunities for further research and scientific advancement remain.
Color centers are defects within the crystal lattice of materials that can emit light (photoluminescence) and, in ideal conditions, serve as optical spin defects useful for energy-efficient quantum sensing applications. These defects are at the forefront of efforts to develop quantum technologies accessible to society. In this research, the focus is on the generation of optical defects in strontium titanate (SrTiO3), explored induced by ion implantation and characterized by their photoluminescence properties.
Freestanding oxide membranes represent a next-generation materials platform, offering additional degrees of freedom that not only enhance existing functionalities but also enable emergent phenomena that are unattainable in their bulk counterparts. Developing these membranes requires a thorough understanding of growth techniques and the dynamics involved in producing high-quality, single-crystalline oxide thin films. Specifically, this thesis details the optimization of thin film growth and fabrication processes to create high-quality, single-crystalline freestanding functional membranes of SrTiO3 and La0.7Sr0.3MnO3. Additionally, this thesis presents the experimental development of strain engineering of these freestanding oxide membranes on flexible substrates, laying the foundation for practical applications in future flexible electronic devices.
The chapters of this thesis highlight various aspects of complex oxide development toward novel applications:
Chapter 1: The theory behind the utilized and studied concepts in complex oxides is detailed.
Chapter 2: Details of the relevant experimental techniques used in this thesis are provided and explained.
Chapter 3: Ion implantation is explored as a method to develop photoluminescent color centers in SrTiO3.
Chapter 4: The optimization of epitaxial thin film growth on La0.7Sr0.3MnO3/Sr3Al2O6 heterostructures is presented.
Chapter 5: The optimized water-assisted fabrication processes for high-quality single-crystalline La0.7Sr0.3MnO3 and SrTiO3 membranes is presented in conjunction with film growth parameters such as oxygen partial pressure and water-soluble sacrificial layer thickness.
Chapter 6: Strain engineering of oxide membranes is investigated on flexible substrates featuring various metal coatings and differing membrane thicknesses.
Chapter 7: Conclusions based on the thesis research are presented, and perspectives on the future of the investigated material systems are discussed.
The aspects examined and described in this thesis represent only a subset of the broader topics within the field. Numerous opportunities for further research and scientific advancement remain.
| Original language | English |
|---|
| Place of Publication | Kgs. Lyngby |
|---|---|
| Publisher | Technical University of Denmark |
| Number of pages | 137 |
| Publication status | Published - 2025 |
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Oxide freestanding film for ultra-sensitive bio-magnetometers
Brand, E. (PhD Student), Pryds, N. (Main Supervisor), Christensen, D. V. (Supervisor), Huck, A. (Supervisor), Jespersen, T. S. (Supervisor), Park, D. (Supervisor), Coll Bau, M. (Examiner) & Schwarzkopf, J. (Examiner)
01/06/2022 → 05/11/2025
Project: PhD