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Growth and characterization of 1D and 2D semiconducting heterostructures

·      Growth by Molecular Beam Epitaxy (MBE) of III-V semicodncutor based heterostructures for opto/micro-electronics and mesoscopic devices.

·      Selective area molecular beam epitaxy of in-plane 1D nanostructures of III-V materials (InGaAs, InAs, InSb…).

·      MBE growth of 2D materials (graphene, hBN et transition metal dichalcogenides).

Suspended InAs nanowire (Nanotechnology 2019, DOI: 10.1088/1361-6528/aaebbd)

► EPIPHY group

Transport mechanisms, optoelectronic/photovoltaic properties and theoretical studies of semiconductor nanostructures

STM images of InAs nanowire (Nanoletters 2019, DOI: 10.1021/acs.nanolett.9b03584)

·    Theoretical and experimental spectroscopic studies of 0D semiconductor nanostructures to study their electronic, optical and photovoltaic properties at the single nanoparticle level, including scanning probe microscopy (STM, AFM/ EFM/ KFM) and transport properties of Si and III-V nanowires

·      Theoretical study of electronic structure and heat transport in 1D nanostructures (semiconductor nanowires, carbon and boron nitride nanotubes) for ultimate electronic devices.

► Physique group / Electrostatics and Physics of Nanosructures, Physics of Nanostructures & Quantum Devices and Namaste teams

Nanostructures for organic and molecular electronics

·      Physics of nanostructures based on organic materials and/or hybrid systems involving organic molecules, polymers, oxides, metallic and/or semiconductor nanostructures

Negative index lens device

► NCM group

Design and characterization of metamaterials

·        Design, fabrication and characterization of devices involving metamaterial technologies. The spectrum of these devices ranges from microwaves to optics and terahertz frequencies.

► Sublambda group

Phononic/Phoxonic, plasmonic and nanoacoustic in micro and nanostructured materials

·        Theoretical study of acoustic wave propagation in phononic crystals and phonon-phonon interaction in phoXonic cavities and waveguides.
·        Prpoagation theory and filtering of surface plasmons-polaritons in metal-insulator waveguides; surface plasmon resonance (SPR) localized in gold nanostructure arrays for biosensor applications.
·        Experimental characterization of the mechanical properties of thin films and vibrations of nano-objects by picosecond acoustics.

►Physique group / EPHONI team

► Physique group /  Nanoacoustique team

Physical simulation of electronic and optoelectronic devices

Modélisation d’un dispositif THz

·        Basic physics of materials, semiconductors or ferroelectrics, used in electronics and optoelectronics to the modeling of devices or even small circuits.

► SILPHYDE group

Molecular, organic and bio-inspired devices

·      Design, fabrication and study of functional molecular devices, organic electrochemical transistors (OECT), molecule-based sensors, organic transistors, rectifying diodes based on organic materials, molecular memories and switches, memristors, synapstors (transistor-synapse) for neuro-inspired architectures and interfacing with biological signals.

► NCM group

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For theoretical and simulation studies, the main techniques used are

• multi-scale simulation and finite element method (COMSOL, Netgen/NGSolve)
• molecular dynamics for the analysis of molecule-surface interactions
• semi-empirical (Tight-Binding) and ab-initio (DFT) methods devoted to the electronic structure of nanostructures and interfaces between semiconductors and oxides with high lattice mismatch
• Boltzmann’s equation and Green’s function methods for electronic transport

For the experimental studies, we benefit from important facilities

• 3 MBE reactors dedicated to III-V semiconductors, graphene/hBN and transition metal dichalcogenides
• 2 chemical vapor deposition system for the growth of graphene and nanowire Si/Ge on metallic substrates, surface analysis system (electron spectroscopy for chemical analysis ESCA)
• 8 scanning probe microscope microscopes (4 systems under ambient atmosphere and 4 systems under UHV)
• micro-photoluminescence and Raman set-ups
• a cryostat for low-temperature electrical measurements under magnetic field
• a picosecond acoustic set-up
• an organic materials and devices platform (3 glove boxes for solution or vacuum deposition and electrical measurements)
• a chemical laboratory for organic synthesis