Probing proton diffusion as a guide to environmental stability in powder-engineered FAPbI3 and CsFAPbI3 perovskites
Résumé
Pre-synthesized perovskite powder is advantageous for device reliability. Arguably, the water uptake capability is critical for the stability of α-FAPbI 3 thin films, and the migration of hydrogen species is challenging to elucidate using routine techniques such as imaging or mass spectroscopy. Here, we decipher the proton diffusion to quantify indirect monitoring of H migration by following the N-D vibration using transmission infrared spectroscopy. Allows the direct assessment of the deterioration of perovskite by moisture. The inclusion of a minor amount of Cs in FAPbI 3 , reveals significant differences in proton diffusion rates attesting to its impact. Its ability to access the active layer by water molecules is five times, lower than FAPbI 3, which is lower than MAPbI 3. This protocol directly correlates with the local environment of the materials and engages with a range of semiconductors to identify the material's reliability and intrinsic degradation mechanisms toward its suitability for optoelectronic applications.
Domaines
ChimieOrigine | Fichiers produits par l'(les) auteur(s) |
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