Publications de Rolf Erni | EPFL Graph Search

Operando Electrochemical Liquid Cell Scanning Transmission Electron Microscopy Investigation of the Growth and Evolution of the Mosaic Solid Electrolyte Interphase for Lithium-Ion Batteries

The solid electrolyte interphase (SEI) is a key component of a lithium-ion battery forming during the first few dischage/charge cycles at the interface between the anode and the electrolyte. The SEI passivates the anode-electrolyte interface by inhibiting ...

Amer Chemical Soc2023

Structure and properties of edge dislocations in BiFeO3

Cécile Hébert, Daniele Passerone, Rolf Erni, Piyush Agrawal

Edge dislocations are frequently found in epitaxial BiFeO3 multiferroic thin films and are expected to exhibit distinctive and localized magnetoelectric properties. However, an exhaustive characterization of these dislocations at the atomic level has to da ...

AMER PHYSICAL SOC2019

InAlN underlaver for near ultraviolet InGaN based light emitting diodes

Nicolas Grandjean, Jean-François Carlin, Mauro Mosca, Camille Haller, Rolf Erni

We report on InAlN underlayer (UL) to improve the efficiency of near ultraviolet (NUV) light emitting diodes (LEDs). While InGaN UL is commonly used in high-efficiency blue LEDs it may absorb light for shorter wavelengths. InAlN lattice-matched to GaN exhi ...

2019

Dopant-Induced Modifications of GaxIn(1-x)P Nanowire-Based p-n Junctions Monolithically Integrated on Si(111)

Anna Fontcuberta i Morral, Kirsten Emilie Moselund, Luca Francaviglia, Rolf Erni, Heike Riel, Nicolas Bologna

Today, silicon is the most used material in photovoltaics, with the maximum conversion efficiency getting very close to the Shockley-Queisser limit for single-junction devices. Integrating silicon with higher band-gap ternary III-V absorbers is the path to ...

2018

Strain-driven oxygen deficiency in multiferroic SrMnO3 thin films

Cécile Hébert, Rolf Erni

The structural and electronic properties of a series of SrMnO3 thin films grown on different substrates leading to different biaxial strains are examined by means of aberration-corrected high-angle annular dark-field scanning transmission electron microsco ...

Amer Physical Soc2016

Manipulating the reaction path of the CO2 hydrogenation reaction in molecular sieves

Davide Ferri, Andreas Züttel, Elsa Callini, Rolf Erni

We demonstrate that the kinetics of the Sabatier reaction catalysed by sorption catalysts depends on the nanostructure of the catalyst-sorbent system. The catalysts are prepared by ion exchange of a nickel nitrate solution in two zeolites with different po ...

Royal Society of Chemistry2015

Direct Evidence of Surface Reduction in Monoclinic BiVO4

Cécile Hébert, Daniele Passerone, Rolf Erni, Piyush Agrawal

Local measurements of the oxidation state of vanadium in monoclinic BiVO4 particles by means of electron energy-loss spectroscopy in scanning transmission electron microscopy reveal a pronounced surface reduction: within a 5-nm-thick shell, the oxidation s ...

Amer Chemical Soc2015

Defects in Two Dimensional Crystals: An Ultra-high Resolution Aberration-corrected Electron Microscopy Study

Oleg Yazyev, Bo Jiang, Rolf Erni

Cambridge, Cambridge University Press2012