Publications de Xavier François Mettan

Interplay between disorder and electronic correlations in compositionally complex alloys

László Forró, Jan Hugo Dil, Luka Ciric, Edoardo Martino, Xavier François Mettan, Trpimir Ivsic, Davor Tolj

Owing to their exceptional mechanical, electronic, and phononic transport properties, compositionally complex alloys, including high-entropy alloys, represent an important class of materials. However, the interplay between chemical disorder and electronic ...

Nature Research2024

Acoustic-Pressure-Assisted Engineering of Aluminum Foams

László Forró, Jacim Jacimovic, Edoardo Martino, Xavier François Mettan

Shaping metals as a foam modulates their physical properties, enabling attractive applications where lightweight, low thermal conductivity, or acoustic isolation are desirable. Adjusting the size of the bubbles in the foams is particularly relevant for tar ...

WILEY-V C H VERLAG GMBH2021

Fighting Health Hazards in Lead Halide Perovskite Optoelectronic Devices with Transparent Phosphate Salts

László Forró, Endre Horvath, Márton Kollár, Pavao Roko Andricevic, Xavier François Mettan

Organic-inorganic lead halide perovskite (CH3NH3PbI3) solar cells have surpassed 25% power conversion efficiency, being ready for industrial-scale production of cheap photovoltaic (PV) panels. In this action, the major hurdle is its lead content, which in ...

AMER CHEMICAL SOC2021

Tuning ferromagnetism at room temperature by visible light

László Forró, Endre Horvath, Bálint Náfrádi, Andrea Pisoni, Massimo Spina, Péter Szirmai, Xavier François Mettan

Most digital information today is encoded in the magnetization of ferromagnetic domains. The demand for ever-increasing storage space fuels continuous research for energy-efficient manipulation of magnetism at smaller and smaller length scales. Writing a b ...

National Academy of Sciences2020

Tailoring thermal conduction in anatase TiO2

László Forró, Luca Rossi, Endre Horvath, Helmuth Berger, Andrea Pisoni, Jacim Jacimovic, Péter Szirmai, Xavier François Mettan

Thermal conductivity (κ) plays an essential role in functional devices. It is advantageous to design materials where one can tune κ in a wide range according to its function: single-crystals and nanowires of anatase polymorph of titanium dioxide, broadly u ...

Springer2019

Light-Emitting Electrochemical Cells of Single Crystal Hybrid Halide Perovskite with Vertically Aligned Carbon Nanotubes Contacts

László Forró, Endre Horvath, Andrzej Sienkiewicz, Bálint Náfrádi, Márton Kollár, Pavao Roko Andricevic, Xavier François Mettan, Tonko Garma

Based on the reported ion migration under an electric field in hybrid lead halide perovskites we have developed a bright, light-emitting electrochemical cell with CH3NH3PbBr3 single crystals directly grown on vertically aligned carbon nanotube forests as c ...

2019

Tailoring thermal properties of functional materials

Xavier François Mettan

Thermal conductivity (k) plays an essential role in functional devices. In some cases, high value is required to transfer heat efficiently. In others, low k assists in maintaining a temperature gradient necessary for device operation. It is profitable to d ...

EPFL2019

Three-Dimensionally Enlarged Photoelectrodes by a Protogenetic Inclusion of Vertically Aligned Carbon Nanotubes into CH3NH3PbBr3 Single Crystals

László Forró, Endre Horvath, Andrzej Sienkiewicz, Bálint Náfrádi, Pavao Roko Andricevic, Márton Kollár, Xavier François Mettan, Klara Hernadi

We demonstrate that single crystals of methylammonium lead bromide (MAPbBr(3)) could be grown directly on vertically aligned carbon nanotube (VACNT) forests. The fast-growing MAPbBr3 single crystals engulfed the protogenetic inclusions in the form of indiv ...

2017

Tuning of the Thermoelectric Figure of Merit of CH3NH3MI3 (M=Pb,Sn) Photovoltaic Perovskites

László Forró, Davor Pavuna, Endre Horvath, Bálint Náfrádi, Andrea Pisoni, Massimo Spina, Xavier François Mettan, Péter Krisztián Matus, Riccardo Pisoni

The hybrid halide perovskites, the very performant compounds in photovoltaic applications, possess large Seebeck coefficient and low thermal conductivity, making them potentially interesting high figure of merit (ZT) materials. For this purpose, one needs ...

American Chemical Society2015

Spectral cola or how to turn green laser light red

Thibaud Humair, Xavier François Mettan, Csaba Forro

A green laser pointer shone through a glass of cola will appear red when looking from above the glass. Lowering the laser so that it is deeper in the cola, the colour will vary from orange to deep red. Fluorescence and absorption spectra were recorded cons ...

Iop Publishing Ltd2014