Publications de Pierre Stadelmann

Electronic structure of Mg2Si by combining electron diffraction and first-principles calculations

We have used accurate convergent beam electron diffraction to determine the structure factors of the reflections most sensitive to the valence-electron distribution in Mg2Si. The experimental values agree well with calculations of the structure factors bas ...

2012

Biexciton emission and crystalline quality of ZnO nano-objects

Jean-Philippe Ansermet, Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Pierre Stadelmann, Pierre Michel Corfdir, Anas Mouti, Elisa Papa

The design of cost-effective standards for the quality of nano-objects is currently a key issue toward their massive use for optoelectronic applications. The observation by photoluminescence of narrow excitonic and biexcitonic emission lines in semiconduct ...

Institute of Physics2011

One-dimensional exciton luminescence induced by extended defects in nonpolar GaN/(Al,Ga)N quantum wells

Benoît Marie Joseph Deveaud, Nicolas Grandjean, Jean-Daniel Ganière, Denis Martin, Raphaël Butté, Jacques Levrat, Pierre Michel Corfdir, Pierre Stadelmann, Tiankai Zhu, Yadira Arroyo Rojas Dasilva

In this study, we present the optical properties of nonpolar GaN/(Al,Ga)N single quantum wells (QWs) grown on either a- or m-plane GaN templates for Al contents set below 15%. In order to reduce the density of extended defects, the templates have been proc ...

Institute of Physics2011

Defects in a-GaN grown on r-sapphire by hydride vapor phase epitaxy

Nicolas Grandjean, Pierre Stadelmann, Denis Martin, Tiankai Zhu

Non-polar a-GaN films grown on r-sapphire by hydride vapor phase epitaxy (HVPE) are studied using transmission electron microscopy (TEM). Despite the small lattice mismatch in a-GaN ([1 0 (1) over bar 0] similar to 1.1% and [0 00 1] similar to 16%), high d ...

2011

Boron nitride multiwall nanotubes decorated with BN nanosheets

Pierre Stadelmann

We report a simple chemical-route to BN multiwall nanotubes decorated with nanosheets. These nanostructures have been prepared on a large scale from a simple unique chemical process under an ammonia flow onto the surface of an alumina substrate, using carb ...

2011

Stress-modulated composition in the vicinity of dislocations in nearly lattice matched AlxIn1-x N/GaN heterostructures: A possible explanation of defect insensitivity

Nicolas Grandjean, Jean-François Carlin, Marco Cantoni, Eric Feltin, Pierre Stadelmann, Anas Mouti, Jean-Luc Rouvière

Evidence of composition fluctuations around threading dislocations at scales ranging from atomic distances to tens of nanometers is provided by z-contrast imaging, strain measurement, and energy dispersive x-ray spectroscopy in AlxIn1-x N/GaN heterostructu ...

2011

Cathodoluminescence in a (S)TEM – Exploring Possibilities and Limits

Anas Mouti, Cécile Hébert, Duncan Thomas Lindsay Alexander, Pierre Stadelmann

Cambridge, Cambridge University Press2010

Core-shell Au@(TiO2, SiO2) nanoparticles with tunable morphology

Pierre Stadelmann, Anas Mouti

A novel approach based on the Stober method allows breaking of the symmetry of core-shell systems based on metallic core and metal oxide shell. By adjusting the proportion of the TiO2 precursor with regard to the silica precursor, different morphologies of ...

Royal Society of Chemistry2010

The symmetry of precession electron diffraction patterns

Pierre Stadelmann

The integrated intensity of the diffracted beams present on microdiffraction precession patterns can be used to infer the 'ideal' symmetry, i.e. the symmetry which takes into account both the position and the intensity of the diffracted beams on a diffract ...

Wiley-Blackwell2010

Core-shell gold J-aggregate nanoparticles for highly efficient strong coupling applications

Pierre Stadelmann

We have developed a straightforward synthetic route to prepare core-shell systems based on gold nanoparticles (NPs) surrounded with J-aggregates molecules. This synthesis allows the direct and efficient coating, at room temperature, of pretreated citrate-s ...

AIP American Institute of Physics2010