Post Doctorat : Ligne SIRIUS
SOLEIL Synchrotron

Post Doctorat : Ligne SIRIUS

France 20 Apr 2021

ABOUT THE INSTITUTION

Soleil is a particle accelerator that produces synchrotron radiation, extremely powerful light source for exploring inert or living matter.
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OPPORTUNITY DETAILS

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20 Apr 2021
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SOLEIL is the French national synchrotron facility, located on the Saclay Plateau near Paris. It is a multi-disciplinary instrument and research laboratory whose mission is to conduct research using synchrotron radiation, to develop cutting edge instrumentation on the beamlines, and to make these developments available to the scientific community. SOLEIL synchrotron, a unique tool for both academic research and industrial applications across a wide range of disciplines including physics, biology, chemistry etc., opened in 2008. It is used annually by thousands researchers from France and abroad. SOLEIL is based on a synchrotron source that is state-of-the-art both in terms of brilliance and stability. This large scale facility, a partner of the Université Paris Saclay, is a “publically owned” private company, founded by the CNRS and the CEA.

The SIRIUS beamline of SOLEIL works in the energy range from 1.2 Kev to 13 keV and serves two scientific communities: the first is active in the field Soft Interfaces and the second in the field Semiconductors, Oxides and Magnetic materials. This post-doc position is open for working on the topics of the second scientific community.

The beamline is designed to perform both x-ray diffraction and x-ray absorption in the hard and tender x-ray range, with dedicated instrumentation for working, at  grazing incidence, on surfaces, interfaces and nanostructures. Moreover, the beamline is able to measure high quality Diffraction Anomalous Fine Structure (DAFS) spectra and the possibility of changing x-ray polarization (linear vertical, linear horizontal, circular) given by a HU36 undulator source makes it also suitable for dichroism and resonant magnetic scattering studies. Unprecedented high flux, coupled to good spectral resolution in the tender x-ray, is provided thanks to a novel multilayer grating monochromator, developed in collaboration with SOLEIL optics group. The beamline has been optimized since 2014 to host an atomic layer deposition reactor (developed in the frame of the MOON ANR project) for performing in situ characterization of the incipient growth of oxide nanostructures [1]. This reactor has been very recently adapted to the growth of transition metal dichalcogenides. The high potential of the beamline for working in the tender x-ray has been made fully available via the installation of a 4-circle diffractometer operated under high vacuum in 2018 [2]. 

The ULTiMeD project

We are looking for a post-doctoral researcher (m/f) who will work at the SIRIUS beamline of synchrotron SOLEIL (Saint-Aubin, Paris area, France) under the supervision of one of our beamline scientists (Dr. Gianluca Ciatto) and in the frame of a new project, named ULTiMeD, funded by the French ANR.

ULTiMeD aims at the atomic-level control over ultrathin 2D layers of Transition Metal Dichalcogenides [3], semiconductor materials with many potential applications, by a Molecular Layer Deposition (MLD) route [4]. The strategy consists in investigating the early stage of deposition and crystallization of 2D SnS2 and TiS2 films processed with organo-sulfides as sulphur source (instead of the classical H2S, adopting a “green” chemistry approach) using the custom-built portable ALD reactor “MOON”.  SnS2 and TiS2 are preferable to the more studied MoS2 and WS2 for the easier integration in devices. The MOON reactor is specifically designed to perform in situ characterization studies during growth by using a suite of synchrotron X-ray structural and spectroscopic techniques (fluorescence, diffraction, absorption) along with complementary analysis (ellipsometry, residual gas analysis) [5-7]. The part of the project to be performed at SIRIUS focuses on the in situ chemical and structural characterization during deposition and annealing. The results of this characterization will be used to optimize the MLD.

Scientific Environment

ULTiMeD is in collaboration with several partners (LMGP, Grenoble; C2P2, Lyon; IPVF, Palaiseau, SOLEIL, CEA-Leti); these collaborations will allow access to the most efficient “green” chemistry to be implemented in ALD, in situ Raman Scattering, X-Ray Photoelectron Spectroscopy, and ab initio DFT calculations. The candidate will work within Synchrotron SOLEIL and in collaboration with all the other institutes involved.

Missions

Qualifications and Expertise

The candidate should hold a PhD in Physics, Materials Science, Chemistry, or associated disciplines.  Experience with synchrotron radiation techniques and in particular with X-ray absorption spectroscopy and relative analysis/simulation will be highly appreciated. 

Moreover, the following skills will be appreciated:

The position requires multidisciplinary skills, sense of responsibility and autonomy together with the ability to work within a team.

The candidate must be fluent in English (written and spoken). Knowledge of French may be useful, but it is not mandatory.

General conditions

This offer concerns a post-doctoral contract for a one year-period, renewable one time.

The remuneration will be based on the SOLEIL salary scale. A wide range of valuable training programs, research and upgrading opportunities will be accessible.  

The position will be available on the beginning of 2021.  Applications should include a motivation letter and Curriculum Vitae.

Contacts

Dr. Gianluca CIATTO (scientist) gianluca.ciatto@synchrotron-soleil.fr

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