A5024442936- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Sensor and Energy Harvesting Materials
- Semiconductor materials and devices
- Advancements in Semiconductor Devices and Circuit Design
- Electronic and Structural Properties of Oxides
- Dielectric materials and actuators
- Integrated Circuits and Semiconductor Failure Analysis
- Acoustic Wave Resonator Technologies
- Multiferroics and related materials
- Thin-Film Transistor Technologies
- Shape Memory Alloy Transformations
- Innovative Energy Harvesting Technologies
- Low-power high-performance VLSI design
- Advanced Thermoelectric Materials and Devices
- Thermography and Photoacoustic Techniques
CEA LETI
2023-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2018-2024
Université Grenoble Alpes
2018-2024
Luxembourg Institute of Science and Technology
2020-2023
CEA LITEN
2018
Competitive cooling with capacitors Current large-scale devices use vapor compression refrigeration. The efficiency of air conditioners has been optimized, but they can be noisy and rely on problematic greenhouse gases. Two groups now present designs for electrocaloric using lead scandium tantalate that change temperature under an electric field. Y. Wang et al. obtained a very large heat flux only solid materials fan to remove from their device. Torello used fluids transfer, leading...
Abstract Electrocaloric materials are promising working bodies for caloric-based technologies, suggested as an efficient alternative to the vapor compression systems. However, their efficiency defined ratio of exchangeable electrocaloric heat work needed trigger this remains unknown. Here, we show by direct measurements and electrical that a highly ordered bulk lead scandium tantalate can exchange more than hundred times it. Besides, our material exhibits maximum adiabatic temperature change...
Abstract Coming up with sustainable sources of electricity is one the grand challenges this century. The research field materials for energy harvesting stems from motivation, including thermoelectrics 1 , photovoltaics 2 and thermophotovoltaics 3 . Pyroelectric materials, converting temperature periodic variations in electricity, have been considered as sensors 4 harvesters 5–7 although we lack devices able to harvest joule range. Here develop a macroscopic thermal harvester made 42 g lead...
Reliable and accurate characterization of the electrocaloric effect is necessary to understand intrinsic properties materials. To date, several methods have been developed directly measure effect. However, each them has some limitations, making less suitable for characterizing ceramic films, which rely almost exclusively on indirect methods. Here, a new approach proposed address process rapid heat dissipation in films detect electrically induced temperature change before it thermally bonds...
Poly (vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) P(VDF-TrFE-CFE) is a relaxor ferroelectric polymer, which exhibits temperature-independent electrocaloric effect at room temperature. In this work, the in film was directly analysed using infrared imaging. 64.8%/27.4%/7.8% (in mole) of (15 ± 1) μm thickness deposited on polyethylene naphthalate substrate. Direct ECE measured from 15 to 35 °C different electric fields. A maximum adiabatic temperature change (ΔTad) 3.58 K during...
Electrocaloric materials in the shape of multilayer capacitors are excellent working bodies to build cooling devices as they can exhibit large changes temperature triggered by voltage over range temperatures. However, high electric fields required drive such a effect and yet, their efficiency has been overlooked. Here we report on lead scandium tantalate capacitors. Hence, show that exchange 25 times more heat than electrical work generate this heat. Besides, observed these multilayers four...
Using an infrared camera, we measured the latent heat of first order phase transition in lead scandium tantalate at different applied electric fields. The entropy change value 3.4 J kg−1 K−1 is consistent with differential scanning calorimetry measurements. advantage such approach stems from possibility to obtain both adiabatic temperature and material only camera or a thermocouple. This may prove useful for systemic characterization electrocaloric materials.
This work is focused on understanding the reasons behind large electrostrictive strain of poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymer. Although a few explanations have been proposed in literature, it remains largely unclear. Here, role an electrically induced phase transition investigated. The crystalline part polymer monitored using XRD while electric field applied onto sample. Three regions interest are clearly evidenced and, particular interest, we...
This work investigates Silicon-on-Insulator (SOI) pMOS drain leakage current. 2D TCAD simulations with Schenk band-to-band tunneling and Field-Enhanced SRH generation recombination models reproduce experimental for various biases temperatures (25 to 125°C). Furthermore, we demonstrate that variation channel thickness is due carrier lifetime variation. Experimentally, working on the lightly doped (LDD) junction (position, steepness dopants level) results in a modulation high electric field...
In this work, we propose to investigate Silicon-on-Insulator (SOI) pMOS behavior modulation due channel doping and its TCAD description. We first demonstrate variation the diffusion through BOX consumption during gate oxide formation. As thickness is not so thin (T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">SI</inf> =22nm), leads different device operation from Fully Depleted (FD) Partially (PD), going an "in between" regime where Floating...
Reliable and accurate characterization of the electrocaloric effect is necessary to understand intrinsic properties materials. To date, several methods have been developed directly measure effect. However, each them has some limitations, making less suitable for characterizing ceramic films, which rely almost exclusively on indirect methods. Here, a new approach proposed address process rapid heat dissipation in films detect electrically induced temperature change before it thermally bonds...