Title | Shedding Light on the Birth of Hybrid Perovskites: A Correlative Study by In Situ Electron Microscopy and Synchrotron-Based X‑ray Scattering
Date |May 6, 2024
Speaker | Charles SIDHOUM, IPCMS Strasbourg
Abstract | Despite the amount of work carried out to optimize the optoelectronic properties of Lead halide perovskites (LHPs), there is a clear lack of comprehension of the phenomena at the origin of LHPs crystallization. The formation of LHPs, including the commonly studied methylammonium lead iodide (MAPI), by ligand-assisted reprecipitation (LARP) remains one of the main explored pathways of synthesis. This approach involved the formation of solvated intermediate phase[1] due to the use of strong coordinative solvent, such as DMF. In this study[2], we took advantage of the development of a series of advanced in-situ techniques to bring new insights into the pathway of this process that leads to MAPI perovskites from a precursor solution. First, we monitored the nucleation and growth processes of a solvated intermediate phase by correlating local information obtained by liquid-phase TEM and more global information brought by synchrotron-based X-ray scattering measurements. Second, we followed in-situ the transition toward MAPI phase by annealing using a combination of gas-phase TEM and temperature-resolved XRD.
Références :
[1] A. A. Petrov et al. Journal of Physical Chemistry C, vol. 121, no. 38, pp. 20739–20743, Sep. 2017, doi: 10.1021/acs.jpcc.7b08468.
[2] C. Sidhoum et al. Chemistry of Materials, vol. 35, no. 19, pp. 7943–7956, Oct. 2023, doi: 10.1021/acs.chemmater.3c01167.
