Partners
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The consortium is constituted by 4 partners CRHEA, L2C, CIMAP, and C2N which are public research laboratories
from the CNRS and French universities.
CRHEA,
Valbonne, is mainly involved in the epitaxial growth of semiconductor materials
(GaN, ZnO, SiC) for applications in electronics and optoelectronics. The
main scientists involved in the project are B. Damilano (coordinator), S.
Vézian, E. Frayssinet, J. Brault, V. Brändli and J. Massies. CRHEA is essentially
in charge of the fabrication of the GaN-based epitaxial structures and the
fabrication of the nanoporous layers by selective area sublimation and also
of their basic characterization.
L2C,
Montpellier, is specialized in the measurement and the analysis of the optical
properties of semiconductors. The scientists involved in the project are
B. Gil (local responsible), G. Cassabois, P. Valvin. L2C measures the photoluminescence
(time-resolved, power dependence, temperature dependence) of nanoporous
GaN layers and (Ga,In)N/GaN quantum well structures in order to determine
the carrier dynamics in such structures and in particular the internal quantum
efficiency.
CIMAP,
Caen. For the last 10 years, the group PM2E of CIMAP has been developing
tools for the structural and chemical investigation of materials using transmission
electron microscopy (P. Ruterana, M.P. Chauvat), combined with atomistic
structural and electronic properties modeling (J. Chen, V. Hounkpati). The
role of CIMAP is the structural analysis of the nanoporous layers made by
selective area sublimation to determine the mechanisms behind the material
quality improvement. The investigations are mainly carried out by using
a double CS corrected 200 KV TEM, providing 0.8 Ĺ spatial resolution, atomic
resolution EDS and EELS. Quantitative X-ray reflectivity (XRR) analysis
using synchrotron radiation or X-ray laboratory microsource as well as grazing
incidence small angle X-ray scattering (SAXS) are carried out in order to
precisely measure the layers pore sizes and porosity (M. Morales).
C2N,
Orsay, is specialized in nanosciences and nanotechnologies with advanced
semiconductor characterization and fabrication tools. The efforts of C2N
in this project are coordinated by M. Tchernycheva, other participants will
be F. Julien, N. Isac, O. Mauguin and a recruited poctdoc fellow. C2N is
in charge of the LED process and characterization. Specific processes using
p-contact based on transparent conductive oxides, but also on Ag-nanowires
or graphene electrodes are adapted to nanoporous layers. Also, ALD passivation
of the pore inner surface are implemented to reduce eventual surface recombinations
and current leakages.