A5039275903- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Memory and Neural Computing
- Perovskite Materials and Applications
- Organic Electronics and Photovoltaics
- Ferroelectric and Negative Capacitance Devices
- Quantum Dots Synthesis And Properties
- Dielectric properties of ceramics
- Nonlocal and gradient elasticity in micro/nano structures
- TiO2 Photocatalysis and Solar Cells
- Topological Materials and Phenomena
- Advanced Photocatalysis Techniques
- Nanowire Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Terahertz technology and applications
- Chalcogenide Semiconductor Thin Films
- Innovative Energy Harvesting Technologies
- Mechanical and Optical Resonators
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Transition Metal Oxide Nanomaterials
Université de Montpellier
2023-2024
Centre National de la Recherche Scientifique
2023-2024
Université Paris-Saclay
2023-2024
Thales (France)
2024
Laboratoire Charles Coulomb
2023-2024
Nanyang Technological University
2019-2023
Laboratoire Albert Fert
2023
Singapore Polytechnic
2019
Technical University of Munich
2015-2016
Institut für Technische und Angewandte Physik (Germany)
2015
Abstract Flexoelectricity induced by the strain gradient is attracting much attention due to its potential applications in electronic devices. Here, combining a tunable flexoelectric effect and ferroelectric photovoltaic effect, we demonstrate continuous tunability of photoconductance BiFeO 3 films. The film epitaxially grown on SrTiO transferred flexible substrate dissolving sacrificing layer. flexoelectricity achieved bending which induces nonuniform lattice distortion thus influences...
Ionic conduction in a ferroelectric leads to anomalous polarization switching kinetics but prevents retention failure.
Epitaxial strain can cause both lattice distortion and oxygen nonstoichiometry, effects that are strongly coupled at heterojunctions of complex nickelate oxides. Here we decouple these structural chemical on the evolution reaction (OER) by using a set coherently strained epitaxial NdNiO3 films. We show within regime where vacancies (VO) negligible, compressive is favorable for OER whereas tensile unfavorable; former induces orbital splitting, resulting in higher occupancy d3 z2- r2 weaker...
The ferroelectric photovoltaic effect has been extensively studied for possible applications in energy conversion and photo-electrics. reversible spontaneous polarization gives rise to a switchable behavior. However, despite its long history, the origin of still lacks full understanding since multiple mechanisms such as bulk Schottky-barrier-related interface effects are involved. Herein, we report comprehensive study on response BiFeO3-based vertical heterostructures, using strategies...
The stable morphology of inverted solar cells during operation is revealed by<italic>in operando</italic>GISAXS, which results in the photovoltaic performance.
The requirement of high‐temperature calcination for titanium dioxide in (solid‐state) dye‐sensitized solar cells (DSSCs) implies challenges with respect to reduced energy consumption and the potential flexible photovoltaic devices. Moreover, use dye molecules increases production costs leads problems related bleaching. Therefore, fabrication dye‐free hybrid at low temperature is a promising alternative current DSSC technology. In this work authors fabricate hierarchically structured titania...
The bulk photovoltaic (BPVE) effect in crystals lacking inversion symmetry offers great potential for optoelectronic applications due to its unique properties, such as above-band-gap photovoltage and switchable photocurrent. Because of their large spontaneous polarizations, ferroelectric materials are ideal platforms studying the BPVE. However, identifying origin an experimentally observed response is often challenging entanglement between interface effects, leading much debate field. This...
Perovskite rare-earth nickelates (RNiO3) have attracted much attention because of their exotic physical properties and rich potential applications. Here, we report systematic tuning the electronic structures RNiO3 (R = Nd, Sm, Gd, Lu) by isovalent A-site substitution. By integrating thin films with Nb-doped SrTiO3 (NSTO), p-n heterojunction photovoltaic cells been prepared performance has investigated. The open-circuit voltage increases monotonically decreasing cation radius. This change...
In the room-temperature magnetoelectric multiferroic BiFeO3, noncollinear antiferromagnetic state is coupled to ferroelectric order, opening applications for low-power electric-field-controlled magnetic devices. While several strategies have been explored simplify landscape, here we directly stabilize a single-domain and spin cycloid in epitaxial BiFeO3 (111) thin films grown on orthorhombic DyScO3 (011). Comparing them with SrTiO3 (111), identify anisotropic in-plane strain as powerful...
Bismuth ferrite (BiFeO3) thin films were epitaxially grown on (110)- and (001)-oriented NdGaO3 single crystal orthorhombic substrates by pulsed laser deposition. The NdGaO3(110) are fully strained show two ferroelectric variants that arrange in a stripe domain pattern with 71° walls, as revealed piezoresponse force microscopy. We explored their antiferromagnetic textures using scanning nitrogen-vacancy magnetometry. Surprisingly given the large compressive strain state, still spin cycloid,...
Insulating antiferromagnets are anticipated as the main protagonists of ultrafast spintronics, with their intrinsic terahertz dynamics and abililty to transport spin information over long distances. However, direct transfer angular momentum an antiferromagnetic insulator at picosecond time scales remains be demonstrated. Here, studying behaviour ferromagnetic metal/antiferromagnetic bilayers, we evidence generation coherent excitations in antiferromagnet combined a modulation demagnetization...
Visible-light-active ferroelectric materials are gaining increasing attention due to the unique photovoltaic effect. To boost light harvesting capability, vast research is devoted band gap engineering by chemical substitutions, regardless of side effect on polarization. Here, we focus how polar order affects optical and properties. Using BiFeO3as model system, induce polarization rotation A-site La substitution, which results in continuous reduction anisotropy samples, as revealed concerted...
On page 7084, P. Müller-Buschbaum and co-workers report the fabrication of dye-free hybrid solar cells based on hierarchically structured titania films poly(3-hexylthiophene) at low temperature. This type has unique advantages with respect to cost energy efficiency. The hierarchical structures are beneficial for enhancing light harvesting in cells, thereby improving device performance. Cover image by Christoph Hohmann, Nano-systems Initiative Munich (NIM).
Bulk photovoltaic (BPVE) effect in crystals lacking inversion symmetry offers great potential for optoelectronic applications due to its unique properties such as above bandgap photovoltage and switchable photocurrent. Because of their large spontaneous polarizations, ferroelectric materials are ideal platforms studying BPVE. However, identifying the origin experimentally observed response is often challenging entanglement between bulk interface effects, leading much debate field. This issue...