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Reference : UPR2940-ELOBER-016
Workplace : GRENOBLE
Date of publication : Thursday, January 30, 2020
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 February 2020
Proportion of work : Full time
Remuneration : Between 2617.05 € and 3017.31 € gross salary according to experience.
Desired level of education : PhD
Experience required : Indifferent
Based on our growth protocol for single crystals, the post-doctoral researcher will have to derive a procedure for the growth in solution of thick, high quality polycrystalline layers of HOIP directly on pixelated substrates. This will require defining the growth conditions as well as conducting structural characterizations of the grown layers (X-ray diffraction, SEM, AFM…).
The privileged relation with the Liten's and Leti's specialists of integration and device fabrication and characterization will be maintained to optimize the structural quality (type and number of defects) with respect to the charge génération and transport properties of interest.
o Primary Tasks:
- Chemical synthesis
- Substrats Preparation (cleaning, …)
- Thin film deposition (spin-coating, deep-coating, …)
- Crystallisation in solution
- Structurales characterizations (DRX, microscopie optique…)
o Secondary Tasks:
- Redaction de rapports/comptes rendus d'expérience
Candidate with a strong interest for experimentation and a strong background in material science is expected. Skills in crystallization are needed, in solution not compulsory but are a plus. Expertise in hybrid perovskite materials elaboration and/or characterizations would be welcome.
Hybrid organic-inorganic perovskite (HOIP) materials are attracting a lot of attention due to their unique combination of advantages: high charge carriers generation and mobility and relative ease of preparation, leading to record efficiencies in photovoltaic. Beyond the original application in photovoltaic systems a recent interest has emerged regarding their use as sensitive layer for the direct detection of ionizing radiations. In the past couple of years Institut Néel (CNRS-UGA), CEA Liten and CEA Leti have initiated a collaboration to study the potential of one specific HOIP (CH3NH3PbBr3 , MAPbBr3) for the detection of X-rays. More specifically, we propose to realize an X-ray imaging device where a thick, polycrystalline MAPbBr3 layer on a pixelated substrate would realize the direct conversion of X-rays into charge carriers. This would allows medical radiography with higher resolution and higher sensitivity and lower the patients' dose.
On one hand Institut Néel has a long experience in single crystal and epitaxial growths in solution and related structural characterizations. On the other hand, CEA Liten and Leti have strong experiences in respectively the fabrication and advanced characterization of hybrid organic-inorganic devices and in the research and developments of X-ray and γ-ray imaging detectors.developments of X-ray and γ-ray imaging detectors.
This study has received the financial support of the European Community through a H2020-ICT5 grant.
Constraints and risks
Chemical Hazard: Pb, organic solvents, halogen compounds
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