Home page The Laboratory Research teams Wide bandgap semiconductors - SC2G

Wide bandgap semiconductors - SC2G

Our research group focuses on a new family of semiconductors characterized by a wide bandgap. The driving force is the development of innovative electronic devices based on these materials for power electronics, light emitting devices, membranes and sensors. For this purpose, our activities include fundamental studies such as diamond heterostructures, transport in nanowires, impurity centres or superconductivity, as well as the technological developments necessary for the fabrication of devices with tailored electronic properties, such as epitaxial growth with in-situ control, nanofabrication, impurity incorporation and gate oxide insulation. As for materials, we mainly study diamond, locally grown and doped in MPCVD (Microwave Plasma Assisted Chemical Vapour Deposition) reactors, as well as Gallium and Aluminum Nitrides, Silicon Carbides and Zinc Oxide grown by partner groups. The carbon-based samples are mostly single crystal, poly- or nanocrystalline thin films, but also homegrown HFCVD (Hot Filament CVD) carbon nanotubes, and their surface is in some cases chemically functionalised. During the last five years our group made significant progress in the understanding and control of electronic properties, and in the fabrication of new devices. Among the achievements worth highlighting, the fabrication and modelisation of delta doped diamond structures that were suggested in the community to improve device conductivity, but our study led to the conclusion that this structure does not improve any transport property. Nevertheless, this structure will be very useful for the development of nano devices. Also, combining a study on the catalytic etching of diamond by metallic nanoparticles with the growth of carbon nanotubes resulted in an original biochemical sensor with nanotubes grown from catalyst buried below the diamond surface, leading to both high sensitivity and high mechanical stability. Regarding power electronic devices, a new gate oxide has been proposed and patented, ensuring an excellent electrical behaviour, and paving the way for the fabrication of the first diamond MOS transistor. Similarly, a new method for the preparation of diamond/metal interfaces has been proposed and patented, leading to high power Shottky diodes. Finally, the electronic properties of nanowires have been explored using original characterization tools, offering a new insight on their properties at the nanoscale. Besides these achievements, the group has contributed to the advancement of differents topics as described below, all aiming both at a better understanding of wide bandgap semiconductors and at the developement of innovative devices and sensors.

Quantum coherence - CQ

Quantum coherence - CQ

Revealing quantum phenomena in electronic nano-circuits
Helium : from fundamental to applications - HELFA

Helium : from fundamental to applications - HELFA

Helium as model system, hydrodynamic and turbulence, space and astrophysics, instrumentation and cryogenic development, kinetic inductance detectors.
Magnetism and Superconductivity - MagSup

Magnetism and Superconductivity - MagSup

Team Magnetism and Superconductivity at Institut NEEL - Systems involving charge, spin or lattice degrees of freedom.
Optics and materials - OPTIMA

Optics and materials - OPTIMA

a complete chain of competences that goes from the design and elaboration of new materials to the study of nonlinear optical properties and plasmonics
Materials, Radiations, Structure - MRS

Materials, Radiations, Structure - MRS

Understanding of the physico-chemical properties of complex materials based on the precise description of their structure
Micro and NanoMagnetism - MNM

Micro and NanoMagnetism - MNM

Complementary expertise in fabrication, characterisation, and simulations for studies in nanomagnetism with applications in spin electronics and micro-systems
Quantum Nano-Electronics and Spectroscopy - QNES

Quantum Nano-Electronics and Spectroscopy - QNES

Electron transport and local spectroscopy of quantum structures
Nano-Optics and Forces - NOF

Nano-Optics and Forces - NOF

Nano - optics and forces
Nanophysics and Semiconductors - NPSC

Nanophysics and Semiconductors - NPSC

Growth of III-V and II-VI semiconductor nanostructures and their physics in search of new functions for potential applications.
Nanospintronics and Molecular Transport - NanoSpin

Nanospintronics and Molecular Transport - NanoSpin

Studying magnetism at the nanoscale, where classical and quantum properties can be combined and used for molecular quantum spintronics
Wide bandgap semiconductors - SC2G

Wide bandgap semiconductors - SC2G

Physics of diamond and other wide bandgap semiconductors towards applications in electronics and biotechnologies
Surfaces, Interfaces and Nanostructures - SIN

Surfaces, Interfaces and Nanostructures - SIN

Experimental and theoretical studies of low dimensional systems
Hybrid systems at low dimensions - HYBRID

Hybrid systems at low dimensions - HYBRID

Electronic, optical, vibrational, mechanical properties, as well as their interplay at the nanoscale, of novel hybrid systems (nanotubes, graphene, two-dimensional and functionalized materials) which are developed by the group .
Condensed Matter Theory - TMC

Condensed Matter Theory - TMC

Theoretical research related to quantum materials and first-principles theory. >> read more
Thermodynamics and Biophysics of small systems - TPS

Thermodynamics and Biophysics of small systems - TPS

Ultra-sensitive instrumentation for electrical and thermal measurements: from biophysics to low temperature condensed matter physics.
Theory of Quantum Circuits - ThQC

Theory of Quantum Circuits - ThQC

Theoretical studies of electronic transport in nanometer-scale devices showing remarkable quantum effects.
Ultra-low temperatures - UBT

Ultra-low temperatures - UBT

Quantum physics at the ultra-low temperature frontier.
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