Nanoscaled ferroelectric (pseudo)-binary oxide thin film supercapacitors for flexible and ultrafast pulsed power electronics - NanOx4Estor

The NanOx4EStor project (Nanoscaled Ferroelectric (Pseudo)-Binary Oxide Thin Film Supercapacitors for Flexible and Ultrafast Pulsed Power Electronics) aims to develop innovative, cost-effective, high-throughput methods for fabricating advanced dielectric capacitors.

These capacitors, based on wake-up-free (pseudo-)binary oxide thin films, are produced through physical vapor deposition (PVD) processes and optimized for superior ferroelectric and energy storage (ES) properties using (i) strain, (ii) interface, and (iii) dead-layer engineering techniques. The innovative results achieved in the project are:

1. Understanding of the phase stability and ferroelectric polarization magnitude HfO2 and ZrO2-based thin films as a function of strain and defect engineering;
2. Comprehensive ferroelectric switching model in ferroelectric doped and undoped HfO2 films.
3. Novel approach for the stabilization of the ferroelectric orthorhombic ZrO2 films, grown by ion-beam sputtering, is demonstrated through nanosecond laser annealing.
4. Antiferroelectric ZrO2-based capacitors, fabricated by plasma-enhanced atomic layer deposition, exhibit an energy storage density up to 84 J/cm3, with an efficiency of 75%. These antiferroelectric nanosupercapacitors exhibit beyond state-of-the-art energy storage capabilities when compared to other antiferroelectric fluorite-based capacitors reported in the literature.
5. Epitaxial ferroelectric La:HfO2-based capacitors, fabricated by pulsed laser deposition, that show an energy storage density higher than 130 J/cm3, with an efficiency close to 70%. This result is among the highest values reported for ferroelectric fluorite-structured capacitor materials.

The NanOx4EStor consortium has published 13 ISI papers (and 3 other are submitted) in the first 2.5 years of the project in high visibility journals including Advanced Functional Materials, Advanced Science, Applied Physics Reviews, Materials Horizons, APL Materials, among others, with a cumulative I.F. above 125. In addition, 32 conference publications were presented at prestigious international conferences and symposia, and 2 symposium/minicolloquia at European conferences (E-MRS 2023 Fall meeting and CMD-31) were organized.

Please see our website for detailed information:  https://inl.cnrs.fr/projects/nanox4estor/

Project Details