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Last news from GEMaC

	Gallium oxide pushes the limits of silicon for power electronics May 25, 2022 Editor’s Choice and one of the most downloaded papers of the ‘Materials’ (MDPI) journal in the first five months of the year, this review discusses the application of ultra-wide bandgap semiconductors in power electronic devices, focusing in particular on gallium oxide.
	A new theoretical approach reveals the emergence of complex self-organised structures in spin crossover materials January 31, 2022 Researchers from GEMaC laboratory have developed an effective electro-elastic model to simulate phase transitions in spin crossover crystals. The resolution of this model is 50 times faster than the traditionally used model, which has allowed them to reveal a wide variety of complex phenomena.
	A series of discoveries about the incredible conductive and transparent materials known as vanadates. November 14, 2021 Strontium and calcium vanadates (SrVO3 and CaVO3) are perovskite oxides. They are materials with multiple potential functions and applications. Here is an overview of recent advances, to which GEMaC has made a major contribution.
	A material conducts to a bright future September 17, 2021 GEMaC researchers show how the conductivity of the spinel material ZnGa2O4 can be controlled over a very wide range, opening up applications in ultra-high power electronics and deep ultraviolet optoelectronics.
	A new crystal phase in semiconductor nanowires June 25, 2021 GEMaC researchers, in partnership with the LEM (CNRS-Onera), have produced and characterised an original and unexpected crystal structure in nanoscale zinc sulphide (ZnS) wires.
	Controlled positioning of quantum light sources in a 2D material June 18, 2021 By exciting a two-dimensional material with an electron microscope beam, our researchers and their collaborators have uncovered new sources of single photons in crystalline materials.
	An Equipex project on diamond for quantum applications May 31, 2021 At UVSQ, the GEMaC laboratory is contributing its expertise on the growth and characterisation of diamonds by cathodoluminescence to the e-Diamant project.
	From the GEMaC laboratory to space: a 20-year history of innovative thrusters for miniature satellites February 3, 2021 A look back at the incredible story of the Petit Propulseur Innovant (PPI) and its successor the µ-PPI, whose prototypes were invented, designed and built at GEMaC.
	GEMaC welcomes two new colleagues! December 1, 2020 We would like to welcome two new GEMaC members hired by UVSQ, Jean-Michel Chauveau (Professor) and Sébastien Colinot (Assistant Engineer).
	MOSTRA project involving GEMaC receives funding from Île-de-France region November 27, 2020 This project is focused on the new generation transmission electron microscope and involves several laboratories in Île-de-France region, including GEMaC. It will be funded via SESAME 2020 program.
	Critical electric field record for gallium oxide November 2, 2020 Increasing the voltage and avoiding breakdown of materials used in power electronics remain a current challenge. The researchers broke a record for the critical electric field with a value of 13.2 MV/cm. This result has been selected as "News from Physics Institute" of CNRS.
	Crystal facet engineering: Christmas tree or Taipei tower-like nanostructures July 3, 2020 The work of GEMaC researchers and engineers is on the cover of Physica Status Solidi RRL of June.
	GEMaC embarks with Flagship Graphene to Core 3 May 28, 2020 Flagship Graphene announced a transition to Core 3, the fourth funding round of the €1 billion research initiative funded by the European Commission.
	Covid19: GEMaC maintains its activities during UVSQ shutdown May 5, 2020 During the health crisis linked to the Covid19 pandemic, UVSQ along with other French universities had to close its doors on March 16, 2020. Nevertheless, the activities of the GEMaC continued unabated.
	A stable white light source for modern lighting and displays March 19, 2020 French and Tunisian researchers evidence and explain very broadband white light emission that is comparable to the reference white light.
	New website for GEMaC March 2, 2020 New, up-to-date and adjustable design suitable for all screen types (computer, tablet, mobile phone) as well as a updated structure based on targeted and accessible content.
	A single nanocrystal maps confined light at the nanometer scale February 28, 2020 The plasmonic properties of a nanohole array probed by a single nanocrystal grafted at the tip of an optical near-field probe: this work by GEMaC researchers was published in the journal Nanophotonics in February 2020.
	A promising way of the integration of single crystalline oxides in electronic devices January 23, 2020 GEMaC and ILV researchers and engineers demonstrate a simple and promising way to transfer epitaxial oxide layers onto silicon
	A polymer antenna for the realisation of a bright and directional single photon source November 4, 2019 Researchers from GEMaC and LPQM (ENS Paris-Saclay) have developed a photonic cavity incorporating a light nanoemitter for efficient quantum light emission.
	Additional functionality in a material with a thousand applications September 11, 2019 Bismuth iron garnet, a material with already remarkable properties, becomes conductive with adjustable resistivity.
	A better understanding of optical properties of hybrid perovskites for photovoltaics and light emission August 15, 2019 Researchers from GEMaC and LuMIn labs unveil charge recombination dynamics in 2D hybrid perovskites, a promising new class of semiconductor materials.
	GEMaC joins the European Graphene Flagship May 1, 2019 The University of Versailles St-Quentin-en-Yvelines joined the European Graphene Flagship research consortium.
	Hexagonal boron nitride, a crystal with astonishing ultraviolet light April 25, 2019 Hexagonal boron nitride (hBN) emits ultraviolet light with an unusually high intensity for an indirect semiconductor. This apparent contradiction was finally explained by the particular nature of the excitons, revealed both by quantitative measurements and by their modelling.
	A promising material for power electronics and optoelectronics in the ultraviolet range April 25, 2018 For the first time, researchers have succeeded in manufacturing large-diameter substrates of both "n" and "p" type β-Ga2O3 semiconductors, making it possible to envision the development of components for both power electronics and optoelectronics in the far ultraviolet.

All the news

News in brief

30/05/2022
Welcome to Lilay Gros Desormeaux, master student (équipe OEN)

9/05/2022
Welcome to Océane Capelle,master student (équipe OEN)

11/04/2022
Welcome to the new members:
Élysé LAURENT, master student (team DIAM)
Mohamed Amine M'TIR, master student (team P2MC)

25/03/2022
Welcome to Théotime Bergèse, master student (team OEN)

10/03/2022
Welcome to the new members:
Soroush Alain ABBASI ZARGALEH, post-doc (FOX)
Ndiaga CISSE, master student (M2, P2MC)
Hamid NEGGAZ, master student (M2, FOX)

21/02/2022
Welcome to Julien GARCIA and Nouhaila AKHYAR, master students (NSP)

01/02/2022
Welcome to Alban Degezelle, master student (team NSP)

12/10/2021
Congratulations Sumit Kumar for your Graduate student award at EMRS fall meeting 2021!

5/10/2021
Congratulations Étienne Carré for your PhD award ONERA 2021 "Matérials and Structures"!

1/10/2021
Welcome to the new members:
Ibtissem Benguettat, ATER (teamFOX) ;
Thi Trang Nguyen, PhD student (team OEN) ;
Joanna Urban, postdoc (ENS Paris-Saclay)
Hugo Levy-Falk, postdoc (ENS Paris-Saclay)

15/07/2021
Three projects of which GEMaC is coordinator or partner, have been accepted for funding by ANR:
E–SCAPE (PI: Aymeric Delteil)
GOPOWER (PI: Ekaterine Chikoidze)
SUPERNICKEL (local PI: Joseph Scola)

1/07/2021
Welcome to Subodh Gautam, post-doctoral researcher (team DIAM)

26/05/2021
Welcome to Séléna Rippe, engineering student (team OEN)

26/05/2021
Welcome to Domitille Gérard, master student (M1, team OEN)

7/04/2021
Welcome to the new members:
Hadji Adama Seck, master student (M1, team P2MC);
Basma Zouari, master student (M2, team P2MC);
Rémi Legrand, DUT intern (team Fox);

2/03/2021
Welcome to the new members:
Thi Huyen Guyen, master student in GEMaC (team OEN) and LuMIn;
Krishnaraja Acharya, master student (team FOX);
Idris Aboubakari, master student (team NSP);
Nour Eddine Riahi, master student (team NSP).

3/02/2021
The project eDiamant, involving GEMaC, is recipient of the call for project EquipEx+!

4/01/2021
Welcome to Nour Belmouri, PhD student in team P2MC !

1/12/2020
Welcome to Mohamed Bouras, new post-doc in team DIAM !

1/10/2020
Welcome to four new recruits: Yoan Bourlier (post-doc in team FOX), Clarisse Fournier (PhD student, team OEN), Zeyu Chi (PhD student, team FOX) et Gia Long Ngo (PhD student, team OEN).

Seminars

	Growth of hBN crystals at atmospheric pressure March 15, 2022 Julien Barjon, Said Hassani et Subodj Gautam GEMaC
	Bipolar conductivity by self-doping in ultra-wide band gap semiconductor Spinel ZnGa2O4 November 15, 2021 Zeyu Chi GEMaC
	Quantum sensing with point defects in semiconductors October 4, 2021 Vincent Jacques Laboratoire Charles Coulomb (université de Montpellier)
	Master thesis seminar September 23, 2021 Thi Huyen Trang NGUYEN Idris ABOUBAKARI Noureddine RIAHI

To t he seminars

Last open positions

II-VI semiconductors 1D nanostructures for light emission

October 1, 2022 - September 30, 2025

The aim of the thesis is to realize II-VI nanowires (ZnS, ZnO, ZnSe), vertically oriented, and defects free. The materials will be grown by using Metal-Organic Chemical Vapor Deposition (MOCVD), and more precisely a catalyzed process called vapour-liquid-solid (VLS) for which the nanowire growth is locally triggered and further produced under a gold droplet. The morphology and the structural properties of the grown nanowires will be accurately characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) to understand the growth mechanisms. The optical properties will be investigated by micro-photoluminescence at 4K and nano-cathodoluminescence, as well as single photon emission in ZnO. Finally, complex II-VI nanostructures such as core-shell structures (e.g. ZnS nanowires covered with a thin ZnMgS layer), or ZnS/ZnSe axial quantum wells will be synthesized. The phD sudent will have the opportunity to attend and present his/her work at national and international conferences.

Nanostructures 1D de semiconducteurs II-VI pour l'émission lumineuse

October 1, 2022 - September 30, 2025

Les nanofils semiconducteurs présentent un intérêt considérable tant pour la physique fondamentale que pour les futures générations de composants électroniques et optoélectroniques, de capteurs, de cellules solaires, et de nano-sources d'énergie. En particulier, les nanofils à base de sulfure de zinc (ZnS) et d'oxyde de zinc (ZnO) sont potentiellement des émetteurs de lumière dans le bleu/UV.L’objectif de cette thèse est d'élaborer et de caractériser des hétérostructures 1D à base semiconducteurs II-VI (ZnS, ZnSe, ZnO… et leurs alliages) parfaitement orientés et exempts de défauts sur substrats cristallins.

Thèse financée ANR - Photonique quantique intégrée basée sur des émetteurs de photons uniques dans des matériaux 2D

October 1, 2022 - September 30, 2025

PhD offer with secured ANR funding
Les défauts profonds optiquement actifs à l'état solide peuvent être considérés comme des atomes artificiels. Ces 'centres colorés' représentent un intérêt majeur pour l'information quantique en raison de leur potentiel en tant qu'émetteurs de photons uniques et de leur intégration possible dans des nanostructures et des dispositifs. Un exemple emblématique est le centre NV (nitrogen-vacancy) du diamant. Les centres colorés récemment découverts dans le matériau 2D hBN (nitrure de bore hexagonal) apportent de nouvelles perspectives d'intégration et d'applications dans les technologies quantiques.

To all the open positions

PhD defences

Propriétés optiques du phosphore noir : du cristal massif aux couches atomiques

June 23, 2022

Présentée par Etienne CARRE
Thèse réalisée sous la direction de Julien Barjon et Annick Loiseau

Propriétés optiques de nanosources de lumière hybrides or/semi-conducteur

June 10, 2022

Présentée par Victor Blondot
Thèse réalisée sous la co-direction de Jean-Pierre Hermier et Stéphanie Buil

Croissance et caractérisation de nanofils ZnS : une étude du polytypisme

March 8, 2022

Présentée par Sumit Kumar
thèse réalisée sous la direction de Vincent Sallet

Habilitations

Réactivité de surfaces pour la fonctionnalisation

December 3, 2021

Présentée par Damien AUREAU
Discipline : chimie - scieence des matériaux
Laboratoire : ILV

Étude de l’élasticité dans les matériaux à transition de spin par le modèle électro-élastique

November 30, 2021

Présentée par Ahmed SLIMANI
Discipline : physique
Laboratoire : GEMaC

Propriétés optiques des pérovskites hybrides

November 12, 2020

Présentée par Damien GARROT
Discipline : physique - milieux denses et matériaux
Laboratoire : GEMaC

Defence agenda