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Offers : 24

Towards the development of high-performance piezoelectric nano-composites for innovative applications in energy conversion

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Start date : 6 January 2020

offer n° IMEPLaHC-10172019-CMNE

Postdoctoral subject:
Towards the development of high-performance piezoelectric nano-composites for innovative applications in energy conversion
IMEP-LaHC / MINATEC / Grenoble-France

 

Keywords:
Nanotechnologies, Nanowires, Piezoelectricity, AFM, Multiphysics simulation, Semiconductor Physics and technology.

Description of the project:
Semiconductor piezoelectric nanowires (NWs) (GaN and ZnO among others) have improved piezoelectric properties compared to thin films and bulk materials, due to their greater flexibility and sensitivity to lower forces. An intrinsic improvement in piezoelectric coefficients has also been identified by recent theoretical and experimental studies [1, 2]. We are interested in the integration of these nanostructures into nanocomposites (formed by NWs embedded in a dielectric matrix). Very recent theoretical studies in our team show that these nanocomposites can feature improved performance compared to thin films [3, 4]. This type of material is therefore very interesting for different innovative applications, especially when integrated into a flexible substrate. In this context we focus mainly on sensor and mechanical energy harvesting applications [5, 6].

The candidate will work in the context of several European projects in collaboration with Italian research institutes and French SMEs among others. He/she will contribute to the technological development to integrate piezoelectric nanowire composites on rigid and flexible substrates, to the electromechanical characterization of manufactured devices using specific characterization benches [7, 8] and to the evaluation of this technology for innovative applications.

Depending on his or her expertise, the candidate will participate in the co-supervision of Master and PhD level students on several activities within the group, including (i) the characterization of nanowires and nanocomposites using AFM (Atomic Force Microscopy) techniques and (ii) the multi-physics simulation of the nanocomposite using commercial FEM simulation software (e. g. COMSOL Multiphysics).

The candidate will acquire expertise in (i) energy conversion using piezoelectric materials, (ii) manufacturing and integrating piezoelectric nanowires into functional devices, (iii) electromechanical characterization of nanowires and associated devices, (iv) the design and simulation of nanocomposites integrating piezoelectric semiconductor nanowires, (v) student supervision.

References:
[1] X. Xu, A. Potié, R. Songmuang, J.W. Lee, T. Baron, B. Salem and L. Montès, Nanotechnology 22 (2011)
[2] H. D. Espinosa, R. A. Bernal, M. Minary‐Jolandan, Adv. Mater. 24 (2012)
[3] R. Tao, G. Ardila, L. Montès, M. Mouis Nano Energy 14 (2015)
[4] R. Tao, M. Mouis, G. Ardila, Adv. Elec. Mat. 4 (2018)
[5] S. Lee, R. Hinchet, Y. Lee, Y. Yang, Z. H. Lin, G. Ardila, et al., Adv. Func. Mater. 24 (2014)
[6] R. Hinchet, S. Lee, G. Ardila, L. Montès, M. Mouis, Z. L. Wang Adv. Funct. Mater. 24 (2014)
[7] R. Tao, M. Parmar, G. Ardila, P. Oliveira, D. Marques, L. Montès, M. Mouis Semicond. Sci. Technol. 32 (2017)
[8] D. Menin, M. Parmar, R. Tao, P. Oliveira, M. Mouis, L. Selmi, G. Ardila IEEE Conf. EUROSOI-ULIS (2018)

More information:
Knowledge and skills required:It is desirable that the candidate has knowledge in one or more of these areas: semiconductor physics, finite element simulation, Atomic Force Microscopy (AFM), clean room techniques and associated characterizations (SEM, etc.).
Location: IMEP-LaHC / Minatec / Grenoble, France
Start of the contract: January/February 2020
Duration of the contract: 1 year, renewable eventually
Advisor: Gustavo ARDILA (ardilarg@minatec.grenoble-inp.fr)

About the laboratory:
IMEP-LAHC is located in the Innovation Center Minatec in Grenoble. It works in close partnership with several national and international laboratories and industrial groups, preindustrial institutes and SMEs. The post-doctoral fellow will work in the Micro-Nano Electronics Components team, in the Integrated Nanostructures & Nanosystems group, and will have access to the laboratory’s technological (clean room) and characterization platforms.

Contacts:
Gustavo ARDILA ardilarg@minatec.grenoble-inp.fr +33 (0)4.56.52.95.32

  • Keywords : Engineering science, Engineering science, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLaHC-10172019-CMNE
  • Contact : ardilarg@minatec.grenoble-inp.fr

Bio-inspired approach for adversarial machine learning

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Start date : 1 October 2019

offer n° PsD-DRT-19-0117

the target of the subject is to analyze a bio-inspired approach based on the so-called Catastrophic Forgetting paradigm to better understand the inherent mechanisms of adversarial attacks and propose new defense scheme against such integrity flaws of classical Machine Learning models (here, deep neural networks). Thus, the topic of the post-doctoral position gathers two major critical issues in the field of Machine Learning and more particularly for deep neural networks:

– Catastrophic Forgetting (or Catastrophic Inference) is a phenomenon referring to the predisposition of a model to forget previously learned information when training with new one. More and more research efforts are focused on overcoming this critical behavior. Previous works lead in the DCOS department in Grenoble prove the relevance and efficiency of re-injections techniques to tackle the Catastrophic Forgetting issue for deep neural network.

– Adversarial Examples refer to an integrity attack where an adversary try to tamper inputs at inference time to fool the decision of a model. This issue is now a popular ML topic with a very dynamic community but with still major open questions and a critical lack of robust defense strategies.

The innovative idea of the project associated to this post-doctoral position is to use research from Neuroscience focused on “Catastrophic Forgetting” to design and evaluate new defense strategies against adversarial examples. The main goal of the post-doctoral work will be to investigate the use of specific networks associated to reinjection processes, as developed in a human memory model and explore how the reinjection procedure use to avoid the catastrophic forgetting issue can alleviate the number of miss-classifications produced by adversarial attacks.

  • Keywords : Engineering science, Computer science and software, DCOS, Leti
  • Laboratory : DCOS / Leti
  • CEA code : PsD-DRT-19-0117
  • Contact : marina.reyboz@cea.fr

Advanced tandem time of flight mass spectrometry for microelectronic applications

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Start date : 1 January 2020

offer n° PsD-DRT-19-0115

The CEA LETI seeks to recruit a post-doctoral researcher to work on the development of advanced time of flight secondary ion mass spectrometry applications (TOF-SIMS). The candidate will work on a new TOF-SIMS instrument equipped with tandem MS spectrometry, in-situ FIB and Argon cluster sputtering. The research project will be focused around the following topics

• Developing methods to correlate TOF-SIMS with AFM, XPS and Auger

• Improving the sensitivity and efficiency of fragmention of the tandem MS spectrometer

• Developing 3D FIB-TOF-SIMS applications and improving the spatial resolution.

The candidate will also have access to the wide range of state of the art instruments present on the nanocharacterisation platform as well as bespoke samples coming from the advanced technology branches developed at the LETI. The candidate will also benefit from a collaboration with the instrument supplier.

  • Keywords : Ultra-divided matter, Physical sciences for materials, DTSI, Leti
  • Laboratory : DTSI / Leti
  • CEA code : PsD-DRT-19-0115
  • Contact : jean-paul.barnes@cea.fr

Developments and applications in nanoelectronics of novel Hard X-ray Photoelectron Spectroscopy with chromium excitation

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Start date : 1 January 2020

offer n° PsD-DRT-20-0002

The CEA LETI seeks to recruit a post-doctoral researcher to work on the development of advanced analytical methodologies in Hard X-ray Photoelectron Spectroscopy (HAXPES). The candidate will work on a novel HAXPES instrument (only three available in Europe to date) equipped with a monochromatic CrK? source. The research project will be focused around the following topics:

• Quantification (empirical determination of elemental Relative Sensitivity Factors),

• Study of multilayer samples (data for the development of thin film algorithms),

• Study of deeply buried, critical interfaces in nanoelectronics.

The candidate will also have access to the wide range of state of the art instruments present on the nanocharacterisation platform as well as bespoke samples coming from the advanced technology branches developed at the LETI. The candidate will also benefit from a collaboration with the instrument supplier.

  • Keywords : Engineering science, Materials and applications, Solid state physics, surfaces and interfaces, DTSI, Leti
  • Laboratory : DTSI / Leti
  • CEA code : PsD-DRT-20-0002
  • Contact : orenault@cea.fr

nanophotonics applied to ultrasensitive biomolecular detection

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Start date : 1 February 2020

offer n° PsD-DRT-19-0104

This project proposes to develop an array of highly sensitive and specific detectors, based on nanowire photodetectors to target single molecule detection (SMD) and biological analysis applications involving a protocol without amplification. Nanowire arrays have the potential to improve the detection limit of DNA strands functionalized with quantum dots markers, without the need for amplification. They are CMOS compatible and will allow ultra-compact integration.

Thanks to their fast response and the ability to create dense arrays over large areas, nanowire photodetector are therefore an interesting approach to detecting rare events (SMD). Nanowire geometry is an interesting approach to optimize the speed-response trade-off.

The first objective of this project will be to explore the physical mechanisms that determine the performance of semiconductor nanowire photodetectors at the level of a single nanowire and then on an array of nanowire photodetectors. The biofunctionalization of this array and its hybridization with labelled DNA strands will be explored.

  • Keywords : Engineering science, Biotechnology, biophotonics, Radiation-matter interactions, DTBS, Leti
  • Laboratory : DTBS / Leti
  • CEA code : PsD-DRT-19-0104
  • Contact : olivier.constantin@cea.fr
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