Séminaire IM2NP - Asma MEDJAHED - Jeudi 11 decembre à 11h

Invitation : Nathalie Mangelinck-Nöel (Département MATER, Equipe MCA).

Diffusion : IM2NP, CINaM, Irphe, Madirel, LP3, PIIM (via T. Angot), CPT (T. Martin), Fédération de Chimie, CP2M

SEMINAIRE Jeudi 11 décembre 2025 à 11h00

Salle des séminaires de l'Im2np, campus de Saint-Jérôme, 1er étage Bâtiment Poincaré

Asma MEDJAHED

CEA-Institut National de l’Energie Solaire, 73375 Le Bourget-du-Lac CEDEX, France

Bend it like superman: Deciphering crystallization mechanisms and microstructure in energy materials using X-ray Diffraction

As human civilization is developing faster than it has ever done, our energy needs are quickly increasing and energy production became a pivotal concern. Fossil fuel consumption has increased around eight-fold over the past 50 years and roughly doubled since 1980. As a direct consequence, the first signs of the current man-made climate change are now observable: heat waves, glaciers melting faster, growing numbers of endangered species… A number of actions are urgently needed to address this issue and limit the rise of the global Earth temperature. One of those levers of action is through decreasing our use of fossil fuels as energy sources and switching to low-carbon, renewable sources. The development of the adequate technology will thus help achieve this goal, both in terms of energy generation and storage.
It is within this context that the work presented here has been conducted, covering the structural study of materials for both energy generation on the one hand and energy storage on the other. We will first focus on hybrid halide perovskites (HHP), compounds displaying highly promising properties for photovoltaics applications. We will follow and decipher the crystallization mechanisms of HHP thin layers with laboratory in-situ XRD measurements before observing the microstructure of these layers using Full-Field Diffraction X-ray Microscopy at ESRF. We will follow up by studying the structural stability and formability of hybrid halide perovskite alloys. Next, operando X-ray Diffraction Imaging experiments on Li-batteries will be shown and quickly discussed. 
While covering a broad range of materials and applications, the presented works illustrate efforts towards better understanding energy materials using X-ray (vision) Diffraction.