Title :

Moisture-Induced Non-Equilibrium Phase Segregation in Triple Cation Mixed Halide Perovskite Monitored by In Situ Characterization Techniques and Solid-State NMR

Author(s) :

Kazemi, Mohammad Ali Akhavan [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Folastre, N. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Raval, Parth [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Sliwa, Michel [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Nsanzimana, J. M. V. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Golonu, S. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Demortiere, A. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Rousset, Jean [Auteur]
EDF R&D [EDF R&D]
Lafon, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Delevoye, Laurent [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Reddy, Manjunatha [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Sauvage, F. [Auteur]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]

Journal title :

ENERGY & ENVIRONMENTAL MATERIALS

Abbreviated title :

Energy Environ. Mater.

Volume number :

-

Pages :

-

Publication date :

2022-03-29

ISSN :

2575-0356

English keyword(s) :

solid-state NMR
phase segregation
perovskite stability
moisture degradation
liquid-cell transmission electron microscopy

HAL domain(s) :

Chimie

English abstract : [en]

Environmental stability is a major bottleneck of perovskite solar cells. Only a handful of studies are investigating the effect of moisture on the structural degradation of the absorber. They mostly rely on ex situ experiments ...
Show more >Environmental stability is a major bottleneck of perovskite solar cells. Only a handful of studies are investigating the effect of moisture on the structural degradation of the absorber. They mostly rely on ex situ experiments and on completely degraded samples, which restrict the assessment on initial and final stage. By combining in situ X-ray diffraction under controlled 85% relative humidity, and live observations of the water-induced degradation using liquid-cell transmission electron microscopy, we reveal two competitive degradation paths leading on one hand to the decomposition of state-of-the-art mixed cation/anion (Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3 (CsMAFA) into PbI2 through a dissolution/recrystallization mechanism and, on the other hand, to a non-equilibrium phase segregation leading to CsPb2Br5 and a Cesium-poor/iodide-rich Cs0.05-x(MA0.17FA0.83)0.95Pb(Br0.17−2yI0.83+2y)3 perovskite. This degradation mechanism is corroborated at atomic-scale resolution through solid-state 1H and 133Cs NMR analysis. Exposure to moisture leads to a film containing important heterogeneities in terms of morphology, photoluminescence intensities, and lifetimes. Our results provide new insights and consensus that complex perovskite compositions, though very performant as champion devices, are comparatively metastable, a trait that limits the chances to achieve long-term stability.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Submission date :

2024-02-28T23:39:07Z
2024-03-19T09:58:39Z