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Study of non-linear electromechanical effects on piezoelectric semiconducting nanowires

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Start date : 01/10/2022

offer n° IMEPLAHC-CMNE-6-2-2022


 PhD.D. student  position at the  LMGP and IMEP-LAHC Laboratories in Grenoble
Study of non-linear electromechanical effects on piezoelectric semiconducting nanowires

Detailed subject :
In recent years, there has been a growing interest in the international scientific community for the study of nanowires (NWs), whose one-dimensional (1D) character gives them unique properties (electrical, mechanical…). These properties can be advantageously exploited for various applications such as sensors, actuators or energy harvesting systems [1-4]. One aspect that has not yet been fully explored is the effect of electromechanical non-linearities that can greatly affect the efficiency of energy conversion.

This PhD. thesis is part of the ANR LATINO project (2022 – 2026) in collaboration with the LMGP and IMEP-LaHC laboratories in Grenoble, IM2NP in Marseille and SOLEIL in Saclay. The work of this thesis will consist, on the one hand, in growing ZnO nanowires by hydrothermal synthesis and in integrating them on various test structures (Fig. 1). These structures will allow their mechanical, electrical or electromechanical characterization. The NWs will be characterized by SEM, XRD among others techniques to control their structural quality, then they will be characterized by advanced modes of AFM (Atomic Force Microscopy) available in the team [5, 6] or by other techniques via partners at national level (i.e. Synchrotron). On the other hand, the PhD. student will develop theoretical models linked to the experiments by exploiting the finite element method, for example with the commercial software COMSOL. The realization of these theoretical and experimental works will allow a better understanding of the linear and non-linear phenomena involved and will allow us to identify optimization guidelines for different applications, for example sensor or energy harvesting.

References :
[1] S. Lee et al., “Ultrathin Nanogenerators as Self-powered/Active Skin Sensors for Tracking Eye Ball Motion”, Adv. Funct. Mater., 24 (2014) p. 1163-1168.
[2] R. Tao et al., “Unveiling the Influence of Surface Fermi Level Pinning on the Piezoelectric Response of Semiconducting Nanowires”, Adv. Electron. Mater., 4(1), (2018) p. 1700299.
[3] R. Tao et al., “Modeling of semiconducting piezoelectric nanowires for energy harvesting and sensing” Nano energy, 14 (2015) p.62-76.
[4] R. Tao et al., “Performance of ZnO based piezo-generators under controlled compression”, Semiconductor Science and Technology, 32(6) (2017) p. 064003.
[5] A. J. Lopez Garcia et al., “Low-Temperature Growth of ZnO Nanowires from Gravure-Printed ZnO Nanoparticle Seed Layers for Flexible Piezoelectric Devices”. Nanomaterials, vol. 11(6), p.1430 2021.
[6] Y.S. Zhou et al., “Nano-newton transverse force sensor using a vertical GaN nanowire based on the piezotronic effect”, Adv. Mater., 25, p. 883-888 2013.

Scientific environment and duration of the project :
The person recruited will work in the Materials and Physical Engineering Laboratory (LMGP, Funsurf team) for the development and structural characterization of NWs and then in the Institute of Microelectronics, Electromagnetism and Photonics (IMEP-LaHC, Micro Nano Electronic Components team) for the integration of NWs as well as for electromechanical characterizations (AFM, etc.). Complementary characterizations could be carried out via local collaborations, for example with the Microelectronics Technology Laboratory (LTM).

Laboratories Web Site:


Start of the thesis:
From October to December 2022 (duration of 36 months)

Funding :
acquired from ANR, gross salary of about 2100 €/month

Profile and skills required :
The candidate should be a student of engineering school and/or Research Master’s degree whose training is mainly focused on materials science and engineering, semiconductor and/or devices physics. Knowledge of microelectronics technologies is desired. Ability to work in a team and to speak and write in English will be appreciated. We are looking for dynamic people who are motivated by laboratory work and fundamental research.

Contacts :
Gustavo ARDILA Tel : 04 56 52 95 32
Céline TERNON Tel : 04 56 52 93 66

Closing date for applications: 15 juillet 2022

  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc, LMGP
  • Laboratory : FMNT / IMEP-LaHc / LMGP
  • CEA code : IMEPLAHC-CMNE-6-2-2022
  • Contact :

Deposition of functional oxides by spatial atomic layer deposition (SALD) for integration in piezoelectric devices

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Start date : 01/10/2022

offer n° IMEPLAHC-CMNE-5-31-2022


 PhD.D. student  position at the  LMGP and IMEP-LAHC Laboratories in Grenoble
Deposition of functional oxides by spatial atomic layer deposition (SALD) for integration in piezoelectric devices

PhD description:
The SALD team is a very dynamic group focusing of the development of functional thin films using scalable chemical vapour deposition approaches (see link). Materials of interest include oxides, metals and metallic nanowire networks for different applications including photovoltaics, sensors, antimicrobial coatings, encapsulation of devices, resistive switching, etc. Our activity and recent research outputs can be checked in the following links: and TALK.
We have recently optimized the deposition of Cu2O thin films with record mobility and conductivity using our SALD deposition system [Nature Communication materials 2021, J. Mater. Chem A 2021]. In the framework of a local collaboration with IMEP-LaHC and LTM laboratories, we plan to develop optimized oxide thin films for integration in piezoelectric devices. Other applications will also be studied through both national and international (Germany, Spain, UK, Portugal) collaborations.
The candidate will focus on the optimization of the SALD deposition parameters and thorough characterization of the materials deposited. The candidate will also be involved in device fabrication and characterization. The ideal candidate is a highly self-motivated individual of any nationality with a strong experimental background in semiconductor device physics and thin films.

From OCTOBER to DECEMBER 2022. Ph.D. Co-supervised by Dr. D. Muñoz-Rojas (LMGP) and Dr. Gustavo Ardila (IMEP-LaHC).

Research profile & skills (required / highly desirable):
Profile (points in bold are mandatory to apply):
Master Degree (or equivalent) in physics, chemistry, chemical engineering or materials science, preferably with a thesis related to thin films
– Experience in thin film deposition techniques (CVD, MOCVD, ALD, SALD, MBE)
Experience in processing, developing and characterizing thin films via techniques such as XPS, AFM, KPFM, electrical characterization and ellipsometry, XRR, XRD, TEM, SEM, SIMS,
Have a solid understanding of physics of semiconductor devices
Fast learner, hands on and have a flexible attitude
– Experience in piezoelectric devices
– Programming skills (labview/python/matlab/etc)
– 3D drawing and CAD design (Blender/Solid Works/Catia/Fusion 360 etc)
– Have experience in 3D printing
– Have experience in building and/or setting up laboratory equipment or simple systems (i.e. Arduino, etc.)
Be someone able to and enjoy to solve problems and pushing your research to achieve results
– High degree of responsibility and independence, while collaborating with your team, lab mates and other laboratory staff.
– Good management skills, good presentation skills, excellent written and oral English level (among non-native English speakers, equivalent TOEFL score of 100 or higher).

Scientific environment:
The candidate will work mainly at the LMGP, Materials and Physical Engineering Laboratory, in the SALD team within the FUNSURF group. Located in the heart of an exceptional scientific environment, the LMGP and IMEP-LaHC offer the applicant a rewarding place to work. The laboratory is very dynamic and highly international. The PhD student will perform part of the characterizations and device fabrication and testing at IMEP-LaHC and LTM labs in the framework of local joint project. The candidate will have the possibility to supervise master students and perform teaching.

Laboratories Web Site:

The position is for 3 years, paid by Grenoble INP (gross salary of 1866 €/month)

Application procedure:
Please send motivation letter, CV, recommendation letters and the name and contact details of 2 references to:
David Muñoz-Rojas: ; Tel: 04 56 52 93 36
Gustavo Ardila: ; Tel: 04 56 52 95 32
Closing date for applications: 31 JULYj 2022


  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc, LMGP
  • Laboratory : FMNT / IMEP-LaHc / LMGP
  • CEA code : IMEPLAHC-CMNE-5-31-2022
  • Contact :

Packaging and miniaturization technology implementation for integrated spectrometer realization: high spectral resolution in the SWIR for telecom and greenhouse gas monitoring

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Start date : 01/09/2022

offer n° IMEPLAHC-PHOTO-05-05-2022

                                  E C O L E   D O C  T O R A L E    EEATS

              Electronique, Electrotechnique, Automatique, Traitement du Signal

               Proposition de thèse, avec financement propre, à démarrer en 2022-2023
Thesis title :
«Packaging and miniaturization technology implementation for integrated spectrometer realization:
high spectral resolution in the SWIR for telecom and greenhouse gas monitoring

Laboratoire d’accueil :
IPAG, équipe instrumentation « CHARM »
IMEP-LAHC, équipe photonique, « PHOTO »

Spécialité de la thèse :
Optique – radiofréquences (OR)

Nature du financement :
Financement Projet Région – Pack Ambition Recherche (obtenu)

Contact pour candidater :
Guillermo Martin,
Institut de Planétologie et d’Astrophysique de Grenoble, Université Grenoble Alpes, Bât OSUG A (CS 40700)
38058 Grenoble Cedex 9
Tél: 04 76 63 52 76

Alain Morand, MCF HDR EEATS, IMEP-LAHC, 50%
Institut de Microélectronique d’Electromagnétisme et de Photonique de Grenoble
Tél: 04 56 52 94
Abstract :
In the recent years, a lot of researchs have been focused on the miniaturization of optical spectrometers. Indeed, these devices are important for optical signal caracterization. The objective of this work is to develop and realize an optical spectrometer having both a compact size and high optical spectral resolution. It is based on the use of a glass integrated photonic chip composed of a straight waveguide finished by a mirror. Nano scattering centers considered as antennas are set on the waveguide surface. Each antenna transmits an optical signal on each camera pixel directly bonded at the surface wafer. The mirror at the end of the waveguide makes a stationary wave in the straight waveguide. The antennas allow to depict the optical intensity of the stationary wave. Then the optical spectrum of the signal can be obtained by applying a fast inverse fast Fourier transform. This approach has already been developed in the wavelength range from 700nm to 1000nm. Now, we are trying to extend this spectrometer skills in the SWIR (from 800nm to 1700nm). A novel approach of the antenna design is proposed to limit the crosstalk on each SWIR camera pixel. The objectives of this work are firstly to optimize the antenna realization used for the sampling. Secondly, the student will develop our ability to package the glass chip with the camera in order to have an airborne equipment.

Profil et skills required :
Student recently graduate from a master degree of Physics, Optical, Optoelectronic, Engineering school (Sup Opt, Phelma …)
Experimental profil, optical characterization, optical set-up use with programming knoweledge (Python, Matlab, Mathcad…), simulation software and visual programming language to control instrument (Labview).
– Propagation waveguide characterization and nano antenna scattering analyis. Data processing, spectrum reconstruction from inverse Fourier Transform, inversion method or least mean square method.
-Modelisation of the waveguide propagation and of the antenna scattering

Profil et compétences requises
Étudiant(e) sortant d’une formation type M2 de Physique Recherche & Innovation, Physique Générale, Optique, Optoélectronique, Ecole d’Ingénieur (Sup Optique, Phelma, …)
Étudiant(e) à profil plutôt expérimental, caractérisation optique, montage de bancs optiques, avec des connaissances en programmation (Python, Matlab, Mathcad…), logiciels de simulation, pilotage (Labview).

– Caractérisation de guides d’onde (propagation) sur lesquelles nous avons réalisé des nano-antennes (diffraction). Traitement des données, reconstruction du spectre par Transformée de Fourier inverse, méthodes d’inversion (Matrices Pseudo-Inverses), minimisation (moindres carrés).

– Modélisation des phénomènes de propagation et interférence du signal optique dans les guides d’onde et extrait de ceux-ci grâce aux plots diffusants.

  • Keywords : Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-PHOTO-05-05-2022
  • Contact :

(filled) Silicon-on-insulator sensors based on out-of-equilibrium potential reading

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Start date : 03/10/2022

offer n° IMEPLAHC-CMNE-3-25-2022

Silicon-on-insulator sensors based on out-of-equilibrium potential reading
Deadline for application: the 23rd of May 2022
Beginning of contract: the 1st of Oct. 2022



IMEP – LAHC, MINATEC – INPG, 3, Parvis Louis Néel, 38016, Grenoble

Irina Ionica (Associate Professor Grenoble ING)

Irina IONICA +33 (0) 4 56 52 95 23

Context and objectives:
Among the sensing devices, the ISFETs (Ion Sensing Field Effect Transistor) occupy an important position thanks to many possible advantages, such as easy co-integration with reading circuitry. However, one of the difficulties when using ISFETs, especially for in-liquid sensing, is that the presence of the gate liquid on the top, close to the channel, can damage the MOSFET. Alternative architectures such as extended-gate FETs¹ can partially solve this issue. In such a case, the sensing part (which is in contact with the liquid) is separated by the transducer (the MOSFET) and this ensures a longer lifetime of the MOSFET, without suffering from any damage due to liquid.
Additionally this separation also allows envisioning hybrid architecture with a silicon-based MOSFET and a sensing region the uses “eco-friendly” / sustainable materials, eventually very cheap and disposable.
The objective of this thesis is to test the possibility to implement such a sensing configuration, using a simple transistor fabricated on silicon-on-insulator (SOI). Besides the novel architecture, the originality of the topic lays in the signal used for the detection: instead of a classical shift in the current through the transistor, the sensing will be done based on the out-of-equilibrium body potential, a phenomenon specific to SOI devices² In our group, we showed that the body-potential response is due to the presence of the Schottky barriers at the contacts³ and that it can be used for sensing4 However, progress is still needed to go from a “laboratory” nice reading paradigm towards a more realistic device with optimized performances in terms of linearity, sensitivity, noise and consumption and this is the aim of this multidisciplinary thesis.

Research to be performed:
In order to reach a pragmatic sensor, starting from our previous proof-of-concept studies some additional steps are needed:

  • validate the out-of-equilibrium body potential signature for an extended-gate FET configuration
  • optimize the device architecture for sensing, in order to exploit at best the physical mechanisms responsible for the out-of-equilibrium potential
  • find the appropriate dynamic conditions of potential reading
  • implement a sustainable sensing layer as extended gate for a realistic bio-chemical application.

The PhD student will develop the complete chain, from device fabrication, electrical measurements in equilibrium and out-of-equilibrium conditions, surface functionalization for specific detection applications (collaboration with Néel Institute, LMGP…). The experimental characterization part will be completed by
segments of modeling and simulation, allowing the comprehension of physical phenomena involved and the
optimization for the sensor.

Knowledge and skills required:
This PhD topic belongs mainly to the field of micro-nano-electronics, and more precisely to the sensing with ISFETs fabricated on SOI substrates. The candidate must have a solid knowledge of physics of semiconductors and devices. Electronics of the measurement systems, surface functionalization would be appreciated. The candidate is expected to enjoy experimental work and the development of adapted measurement protocols.
Scientific curiosity, motivation, creativity are mandatory qualities in order to take full advantage of the scientific environment of this thesis and to gain excellent expertise for his/her future career. The topic is in the field of applied physics, but close to the fundamental physics, as well as to the industrial world.
After the PhD, the candidate will easily adapt to both academic and industrial research environments.
The candidate must have a very good academic record, with high grades.

1 Won-Ju Cho, Cheol-Min Lim, Sensing properties of separative paper-based extended-gate ion-sensitive field-effect transistor for cost
effective pH sensor applications, Solid-State Electronics, Volume 140, pages 96-99, 2018
2 M. Alepidis, A. Bouchard, C. Delacour, M. Bawedin and I. Ionica, “Out-of-Equilibrium Body Potential Measurement on Silicon-on-
Insulator With Deposited Metal Contacts,” in IEEE Transactions on Electron Devices, vol. 67, no. 11, pp. 4582-4586, 2020
3 Alepidis, M., Ghibaudo, G., Bawedin, M., & Ionica, I., Origin of the Out-of-Equilibrium Body Potential In Silicon on Insulator Devices With Metal Contacts. IEEE Electron Device Letters, 42(12), 1834-1837, 2021
4 Alepidis, M., Bouchard, A., Delacour, C., Bawedin, M., & Ionica, I., Novel pH sensor based on out-of-equilibrium body potential
monitored in silicon on insulator with metal contacts. In ECS Meeting Abstracts (No. 59, p. 1589). IOP Publishing, 2021

  • Keywords : Engineering science, Engineering sciences, Electronics and microelectronics - Optoelectronics, FMNT, IMEP-LaHc
  • Laboratory : FMNT / IMEP-LaHc
  • CEA code : IMEPLAHC-CMNE-3-25-2022
  • Contact :
  • This Thesis position has been filled. Thank you for your interest

VHF voltage regulated converter incorporating innovative passive components

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Start date : 01/09/2022

offer n° SL-DRT-22-0658

The aim of the thesis is to develop a very high frequency voltage regulated converter (> 10 MHz) and exploiting innovative passive components. The increase in frequency allows the use of smaller passive components in value, size and weight. Indeed, the higher the frequency is, the lower the energy is stored and exchanged per cycle, the lower the volume of the inductor and / or capacity is and the higher the power density of the converter is. Moreover, a high switching frequency allows a faster converter response to operating condition changes (shorter response time).

However, when the converters operate at more than 10MHz, commonly used structures, even conventional resonant structures, are no longer suitable even via Zero Voltage Switching (ZVS). This is why a new inverter topology, breaking with half or full bridge topologies is being considered.

The objective of the thesis is to make VHF structures usable for common purposes by making the converter completely controllable: automatic frequency tracking, ZVS and output voltage regulation at the desired value. In addition, we aim to reduce, or even eliminate, the remaining inductances to gain compactness and EMC. We will also explore galvanic insulation aspects.

  • Keywords : Défis technologiques, Sciences pour l'ingénieur, Efficacité énergétique pour bâtiments intelligents, mobilité électrique et procédés industriels, Electronique et microélectronique - Optoélectronique, DSYS, Leti
  • Laboratory : DSYS / Leti
  • CEA code : SL-DRT-22-0658
  • Contact :
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