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Reference : UMR7347-DAVCHO-003
Workplace : TOURS
Date of publication : Monday, April 05, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 June 2021
Proportion of work : Full time
Remuneration : 2648€ per month (gross income, before tax)
Desired level of education : PhD
Experience required : Indifferent
This postdoc offer is part of the ANR BePolar in collaboration with the CEA-SPEC (Saclay), CEMES (Toulouse) and STMicroelectronics (Tours). The objective of this project is to control the polarization and the Schottky barrier in metal / ferroelectric junctions by chemical modulation of the interface. The project proposes to incorporate a layer of perovskite oxide of a few nm at the interface between the metal electrode and the ferroelectric layer of (Ba, Sr) TiO3 type. The isomorphism of the perovskite oxide structure allows to chemically tune the electronic properties using e.g. rumpling, polar discontinuity, BO6 octahedral rotations as potential levers. A systematic interface engineering using Combinatorial Pulsed Laser Deposition (ICPLD) will produce heterostructures with continuously modulated interface composition and FE thicknesses. Advanced spectroscopy and microscopy methods, implemented within the consortium (laboratory and synchrotron photoemission, aberration corrected TEM techniques, UHV-SPM), coupled with first-principles calculations, will be used to investigate the chemical, structural and electronic mechanisms controlling band alignment and polarization at the interface. Optimized interfaces will then be tested in TRL 6 industrial prototype varactors.
The recruited person will be responsible for developing metal / ferroelectric heterostructures incorporating the modulated interface layer. He/She will study the structural and chemical properties of these structures by XRD, AFM, SEM or WDS techniques and will electrically characterize the junctions. He/She will have to work in close interaction with the other project partners to analyze and correlate the results of TEM, XPS / UPS, SPM and DFT analyzes.
- Synthesis of hetero-structures by laser ablation
- Chemical (WDS) and structural (XRD, AFM, SEM) characterization of the thin layers produced
- Electrical characterization of devices
The candidate will hold a doctorate in the field of Materials Science or Condensed Matter Physics. The following skills will be appreciated:
- Expertise in manufacturing and characterization of thin oxide films
- Expertise in photoemission spectroscopy would be a plus.
- Ability to work in a team and interact with several research teams
The person recruited will work at GREMAN laboratory on the site of the Sciences and Techniques UFR of the University of Tours as well as on the STMicroelectronics site by joining the team that studies oxide materials.
Constraints and risks
Duration: 12 months extendable to 24 months
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