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Reference : UMR5628-JEADES-002
Workplace : GRENOBLE
Date of publication : Tuesday, February 05, 2019
Type of Contract : FTC Scientist
Contract Period : 11 months
Expected date of employment : 25 March 2019
Proportion of work : Full time
Remuneration : between 2530 € and 2900€ gross monthly
Desired level of education : PhD
Experience required : 1 to 4 years
For the next generation of RF components, the project focuses on the study of the deposition by CVD of vanadium oxide - VO2 thin films and especially on the optimization and control of its metal-insulator transition related to the deposition conditions. This mission is integrated in an ANR project which brings together 6 partners to lead to the realization of different demonstrators.
The development of VO2 thin films will involve a Chemical Vapor Deposition (MOCVD) reactor. The work will establish the correlations between the experimental conditions of elaboration (temperature of deposits, gas flow, concentration of precursors) and the microstructural and physicochemical properties of the deposited layers. The characterization of the layers will involve a wide range of techniques: scanning electron microscopy, microanalysis X or atomic force microscopy to determine morphology and composition; also X-ray diffraction, infrared or Raman spectroscopy for structural properties as well as electrical measurements to determine the characteristics of the metal-insulator transition. Since this transition is related to a structural change, it will also be followed by in situ temperature analysis by X-ray diffraction and Raman spectrometry. The characteristics of the transition will be studied according to the type of substrates used in correlation with the type of growth obtained. Lastly, the optical activation of the transition of certain samples will be studied as part of the ANR project in collaboration with the project partners.
The applicant should have a PhD in materials science or physical-chemistry, with a proven experience in thin films growth ( experience in MOCVD growth will be appreciated) and characterization of materials:.
1/structural characterization (Xray diffraction - Bragg Brentano and texture analysis, IR and Raman spectrometry …)
2/Scanning electronic microscopy
3/electrical properties measurements
The applicant should be able to work independently, have a good English level and exhibit human skills to work within a motivated team of technicians and researchers and as general skills:- Planning and implementation of research work within defined deadlines;
- Valorization of research results through oral and written presentations
Scientific context :
In the field of radiofrequency communications, ultrafast switching represents a crucial issue for the development of communication networks with the very high-speed nomadic connection. This function is currently performed by components essentially using MEMs. Due to the mechanical movement that is implemented, the switching times are limited to values of the order of one microsecond. To overcome this limit and realize ultrafast RF switches, using the metal insulator transition of certain compounds is a promising solution. In this context, the project aims to study the elaboration of thin layers of VO2 vanadium oxide in its monoclinic phase, which has a very pronounced conduction transition over more than three orders of magnitude between the insulating state and the metallic state when it passes over 340K.
The candidate will work within the LMGP, Materials and Physical Engineering Laboratory in Grenoble, in the FunSurf group (Functional thin films and surface nano-engineering - 10 permanent researchers). Located in the heart of an exceptional scientific environment, the LMGP offers the applicant a rewarding place to work (LMGP Web Site: http://www.lmgp.grenoble-inp.fr/).
The mission is integrated in an ANR project which brings together 6 partners ( ANR MUFRED - Microwave Ultra-Fast Reconfigurable Electronic Devices)
The staff will be hosted in the LMGP laboratory in Grenoble, a joint GINP / CNRS research unit made up of around one hundred people. Three research teams work on the following themes: Interaction on biological materials, Nanostructures and heterostructures, Thin functional layers and nano-engineering of surfaces ..
Constraints and risks
use of chemicals products (solvents, precursors)
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