Fundamental Research Division
The DRF at the CEA assemble approximately 6,000 scientists since January 2016.
Scientific result | Micro-nanotechnologies
InGaN/GaN quantum multiwells are incorporated on the surface of the GaN wires, parallel and perpendicular to their axis. By focusing a high-energy X-ray beam across a 60 x 60 nm2, the researchers were able to highlight a correlation between crystallographic polarity maps and electronic band structure defects, in the case of individual wires. They were also able to observe the diffusion of charge carriers without electrical contact. These nanoscale synchrotron analyses lead to a better understanding of the link between optical emission and elemental composition.
X-ray excited photoluminescence and spectral analysis (in the visible and near-UV) can also be supplemented by absorption spectroscopy and μLaue diffraction to study other semiconducting, optoelectronic or photovoltaic hetero-structures.
Silane-induced N-polarity in wires probed by a synchrotron nanobeam, Nanoletters.
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.