Post-Doc: Synthesis Of Hybrid Perovskites Powders From Solutions For Electromagnetic Wave Absor[...]
3 semanas atrás
Organisation/Company: CNRS
Department: Institut NEEL
Research Field: Physics
Researcher Profile: Recognised Researcher (R2)
Country: France
Application Deadline: 1 Dec 2024 - 00:00 (UTC)
Type of Contract: Temporary
Job Status: Full-time
Hours Per Week: 35
Offer Starting Date: 1 Jan 2025
Is the job funded through the EU Research Framework Programme? Not funded by a EU programme
Is the Job related to staff position within a Research Infrastructure? No
Offer Description
Synthesis in solution can provide HP samples which, depending on the implementation, present a variety of defect contents. Mild crystallization conditions in bulk solutions leads to crystals with very low defect contents (strain, dislocations…). As such, it will be used to produce reference samples. Alternatively, by adapting systems already in place at Institut Néel, crystallization in solution further away from equilibrium should lead to powders with increasing amounts of defects. These samples of varying defect content compared with those derived from mechanosynthesis, will enable to study the contribution of the defect structure, aiding in identifying which defect types that are beneficial to EMWA.
Responsibilities:
Synthesis of hybrid perovskites and/or precursors (primary task)
Adaptation of crystallization systems to hybrid perovskites (secondary task)
Determination of process points for perovskite synthesis (primary task)
Structural, spectroscopic characterizations of powders (XRD, Raman, SEM, UV-Vis, PL…) (primary task)
The increased use of electronic devices and the rapid development of associated technologies (like the advent of fifth generation wireless communication) have led to interferences issues from various systems (cell phones, wireless LANs, satellite broadcasting systems, etc.) and significant electromagnetic wave pollution. To tackle these challenging issues, electromagnetic absorbing materials in the corresponding frequency domain (GHz) are urgently pursued. ElectroMagnetic Wave Absorbing Materials (EMWAMs) exhibit either magnetic or dielectric loss, the energy absorbed from the radiation being ultimately converted into heat, dissipated into the environment. In that context, the ABPERO ANR project aims at developing new EMWAMs based on hybrid perovskites (HPs). HPs are complex dielectric materials exhibiting a broad range of polarization mechanisms, which have been very little studied for this application. Because those mechanisms are strongly influenced by the structure of the HP and the defects present, both aspects will be studied. Several HP structures will be considered and for each two synthesis routes will be explored to reach various types and concentrations of defects: a chemical approach using solutions and mechanosynthesis. The obtained HP powders will then be used to form the composite materials to be evaluated as EMWAMs. The targeted features are a high absorption over a wide range of GHz frequencies, easy shaping, low thickness and stability (chemical, thermal).
In the framework of this project, the candidate will be involved in the chemical route for the synthesis of HP powders at Institut Néel (Grenoble, France). He will join the Plum Dept in the Optics & Materials (OptiMa) team, a group of 15 physicists, theoreticians and physico-chemists. This work will be carried out with two supervisors at Institut Néel and in close collaboration with teams at ICPEES (Strasbourg, France) that will be in charge of the mechanosynthesis of HPs and at IPCMS (Strasbourg, France) for the evaluation of the EMWAMs composites.
The Institut NÉEL is a CNRS unit (UPR 2940) under agreement with the University Grenoble Alpes. The laboratory is related to the CNRS Physique. It is located in Grenoble, in the heart of a unique scientific, industrial and cultural environment. It is one of the largest French national research institutes for fundamental research in condensed matter physics enriched by interdisciplinary activities at the interfaces with chemistry, engineering and biology. It consists of 450 employees, including 175 researchers.
Skills Required:
Solution chemistry
Hybrid Perovskites Chemistry
Crystallization in solution
Solid state characterizations
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Porto, Porto, Portugal Cnrs Tempo inteiroJob SummaryWe are seeking a highly skilled Senior Research Scientist to join our team at CNRS. This is an exciting opportunity to contribute to the development of new electromagnetic wave absorbing materials based on hybrid perovskites.
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