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Offers : 14

Plastronic Innovation Elaboration of wireless communicating functions by printing of functional inks during 3D manufacturing of plastic housing.

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Start date : 1 November 2016

offer n° IMEPLaHC-29102016-RFM

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Subject of doctoral thesis
Plastronic Innovation :
Elaboration of wireless communicating functions by printing of functional inks during 3D manufacturing of plastic housing.

KEYWORDS :
* Materials: Rheology of complex fluids, surfaces and interfaces physico-chemistry, deposit processes, electromagnetic properties, plastic materials converting
* Communication systems: Circuits for wireless communications, sensors, electromagnetism, multi-physic modeling, electromagnetic modeling.

CONTEXT :
This thesis work is a part of an industrial chair funded for five years by the Grenoble INP foundation. This ambitious project aims to explore the new technologies sustainable and low cost of printing and of functional inks for the design of wireless communication functions in 3-dimensions inside plastic housings (electrical boxes, switches…).

The project partners are two laboratories of University Grenoble Alpes, as well as the international Schneider Electric society, specialist of energy management.
The expected work is multidisciplinary, involving knowledge in material rheology, surfaces and interfaces physico-chemistry allowing the elaboration, by printing processes, of wireless communication systems of a new generation, from their design to their modeling.

PROFILE OF THE APPLICANT :
Preferentially with a training in applied physics, the applicant will have to deal with aspects concerning both materials (rheology, physico-chemistry, …), communication systems, but also electromagnetics and multi-physic modeling. He will have to show a great curiosity and be able to build a large basis of knowledge, with the help of the whole skills constituted by Schneider Electric and the two world-renowned laboratories of Grenoble.
Due to the ambitious proposed subject, the PhD student will present his results in the major international conferences and will publish in the major journals of the explored domains.
REMUNERATION :
* 2200 € gross/month

CONTACTS :
*Nadège Reverdy-Bruas (Grenoble INP): nadege.reverdy@pagora.grenoble-inp.fr
*Tan-Phu Vuong (Grenoble INP) : Tan-Phu.Vuong@minatec.inpg.fr

 

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-29102016-RFM
  • Contact : Tan-Phu.Vuong@minatec.grenoble-inp.fr

Efficient single-photons source based on semiconductor nanowires

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Start date : 1 October 2017

offer n° SL-DRF-17-0322

The single-photons source is a key element in the framework of quantum communication and computing. Single-photons, emitted one by one and encoded by their polarization, act as flying qubits for the information exchanges. They are in particular required in many quantum cryptography protocols, intrinsically secure, that allow the transmission of a secret decryption key. Such a source can be obtained using semiconductor quantum dots as demonstrated in various material system. However such demonstrations were mostly restricted to cryogenic temperatures. Our group has demonstrated very recently that a CdSe quantum dot inserted in a ZnSe nanowire can emit single-photons up to room temperature [1]. This first demonstration for an epitaxial quantum dot opens the prospect for a realistic application of quantum dots in quantum information technologies. Moreover, the emission in the visible spectral range of these CdSe/ZnSe quantum dots is particularly well suited for communications in free space (for ground-satellite links for example) thanks to the transparency of the atmosphere and the availability of fast single-photon detectors in this spectral domain.

The PhD goal consists in developing efficient single-photons sources made of quantum dots formed in II-VI semiconductor nanowires. It will consist in investigating (i) the growth of core-shell type nanowire heterostructures in order to enhance the emission quantum yield, (ii) the coupling of these nano-emitters to various photonic structures for an efficient light extraction and collection, (iii) the possibility to implement an optical excitation with micro-laser for a compact device. These studies offer the possibility to explore basic physical phenomena (growth mechanisms, nanostructure-photon interaction etc…) at the nanometric scale while contributing to the development of an original and essential device for the field of quantum communication and quantum information processing.

[1] Ultrafast Room Temperature Single-Photon Source from Nanowire-Quantum Dots, S. Bounouar et al., Nano Lett. 12, 2977 (2012).

  • Keywords : Radiation-matter interactions, Solid state physics, surfaces and interfaces, INAC, PHELIQS
  • Laboratory : INAC / PHELIQS
  • CEA code : SL-DRF-17-0322
  • Contact : eamalric@cea.fr

Towards safer-by-design quantum dots

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Start date : 1 October 2017

offer n° SL-DRF-17-0209

Quantum dots (QDs) are semi-conductor nanocrystals showing improved optical properties. Today, QDs are included in LCD screens, TVs, solar cells and OLEDs. These QDs are most of the time Cd-based QDs, i.e. CdSe. If not appropriately recycled, this equipment may release either QDs, or the toxic metal ions that they contain, in the environment. Strategies to reduce this toxicological impact consist in i) coating QDs with inert material such as ZnS to reduce the release of toxic metal ions, ii) developing QDs made of materials that are supposed to be less toxic, such as InP, CuInS2/CuInSe2.

In the frame of the SERENADE labex (SAQADO project), the aim of the present project is to develop new formulations of QDs, in a “safer-by-design” perspective. These formulations will then be tested for their toxicity, either in their pristine form, or after ageing under environmental conditions. Their physico-chemical properties and their fate after ageing will be characterized (size, composition, agglomeration/aggregation state, dissolution…). Their toxic effects will be assessed on human primary keratinocytes, particularly their cytotoxicity, oxidative stress, DNA damage.

This pluri-disciplinary project involves biology experiments in a cell culture laboratory, physico-chemical analysis on medium and large-scale facilities such as the nanocharacterization platform at CEA Grenoble, X-ray tomography in Aix-en-Provence, as well as synchrotron beamlines. Therefore the candidate will have a pluridisciplinary background, possibly centered on biology/biotechnology/materials and chemistry/physico-chemistry.

  • Keywords : Life Sciences, Toxicology, Ultra-divided matter, Physical sciences for materials, INAC, SyMMES
  • Laboratory : INAC / SyMMES
  • CEA code : SL-DRF-17-0209
  • Contact : peter.reiss@cea.fr

Germanium doping of GaN-based nanostructures for LEDs

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Start date : 1 October 2017

offer n° SL-DRF-17-0248

The target of this thesis is to assess the advantages and physical limits of Ge doping of GaN as compared to Si doping, by analyzing Ge-doped thin films and NWs by means of cutting-edge structural characterization, namely Atom Probe Tomography (APT) and transmission electron microscopy (TEM), and correlating the structural/chemical features with the optical and electrical performance.

The nanostructures will be designed in view of their incorporation in GaN LED devices:

* (Al)GaN thin films and quantum wells: Ge is expected to increase the n-type GaN thickness before cracking. Side effects on resistivity and structural and optical properties are to be evaluated. The onset of DX behavior in AlGaN will be studied.

* GaN NWs: The potential improvement of the NW morphology and homogeneity of the dopant distribution are to be studied.

* Impact in the complete device structure: We will evaluate the effect of Ge doping on the uppermost layers of the LEDs, including the presence or not of segregation or memory effects.

  • Keywords : Engineering science, Electronics and microelectronics - Optoelectronics, Solid state physics, surfaces and interfaces, INAC, PHELIQS
  • Laboratory : INAC / PHELIQS
  • CEA code : SL-DRF-17-0248
  • Contact : eva.monroy@cea.fr

Transport measurement in topological materials

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Start date : 1 September 2016

offer n° SL-DRF-17-0278

The main objective of the project is to understand at a fundamental level the various unconventional phenomena that are present in the topological 3D semimetals with original experimental studies. Thus, the student will be involved in the characterization measurements (resistivity, thermoelectric power, specific heat…) at very low temperature and high magnetic field, data analysis, and improving the experimental device. He may also collaborate with others in the laboratory doing complementary measurements on these compounds and he may be bringing to perform experiments with large instruments (LNCMI…).

It is also consider giving the student the opportunity to realize his own crystals because the laboratory has a very performing crystal growth team.

The candidate will possess a strong background in physics of condensed matter and/or quantum mechanics and strong motivation for experimental work requiring complex and delicate instrumentation. They will become independent on cryogenic techniques, crystal growth and characterization relying initially on the expertise of researchers in the laboratory. They will actively participate in discussions and work with the team involved in the research topic.

  • Keywords : Solid state physics, surfaces and interfaces, INAC, PHELIQS
  • Laboratory : INAC / PHELIQS
  • CEA code : SL-DRF-17-0278
  • Contact : alexandre.pourret@cea.fr
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