Examining a Year-Long Chemical Degradation Process and Reaction Kinetics in Pristine and Defect-Passivated Lead Halide Perovskites - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry of Materials Année : 2023

Examining a Year-Long Chemical Degradation Process and Reaction Kinetics in Pristine and Defect-Passivated Lead Halide Perovskites

Résumé

As a promising solar energy harvesting technology, solution-processed metal halide perovskites (MHPs) are of great current interest in developing low-cost and efficient photovoltaic cells. Despite their excellent optoelectronic properties and the nascent advancements in compositional tailoring and interfacial engineering to develop high-performance MHPs, issues associated with the long-term environmental stability of these materials are yet to be addressed. Here we examine the moisture-induced cascade degradation reactions over a year for methylammonium lead iodide (MAPbI3)- and formamidinium-rich [Cs0.05(MA0.17FA0.83)0.95Pb(Br0.17I0.83)3] formulations at 40 and 85% relative humidity (RH) in the air. The transformative reactions at 85% RH lead to chemical degradation process in both MA-rich and FA-rich perovskites, yielding to the different organic and inorganic byproducts within a few hours, but the exposure to 40% RH retains the longevity of these materials up to several months. The defect passivation by the tetrapropylammonium cation (TPA+) imparts enhanced stability of MAPbI3 particles, irrespective of the exposure conditions to water vapor. By resolving thin-film morphology at sub-nanometer to nanometer resolution using solid-state (ss)NMR spectroscopy and X-ray diffraction techniques, kinetics of degradation reactions and structural insights into the inorganic/organic interfaces and degradation products are obtained and compared. Our findings provide mechanistic details into the cascade degradation reactions in pristine and defect-passivated MHPs, enabling guidance for novel passivating and interfacial engineering strategies to further improve the robustness of the MHPs with respect to environmental stressors.

Domaines

Matériaux
Fichier principal
Vignette du fichier
R2_Raval et al_ Chemial degradation reactions in perovskites_manuscript_final.pdf (1.86 Mo) Télécharger le fichier
R2_Raval et al_Chemial degradation reactions in perovskites_Supp Info__final.pdf (1.5 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification
Licence : CC BY NC ND - Paternité - Pas d'utilisation commerciale - Pas de modification

Dates et versions

hal-04087996 , version 1 (03-05-2023)

Identifiants

Citer

Parth Raval, Mohammad Ali Akhavan Kazemi, Julie Ruellou, Julien Trébosc, Olivier Lafon, et al.. Examining a Year-Long Chemical Degradation Process and Reaction Kinetics in Pristine and Defect-Passivated Lead Halide Perovskites. Chemistry of Materials, 2023, 35 (7), pp.2904-2917. ⟨10.1021/acs.chemmater.2c03803⟩. ⟨hal-04087996⟩
37 Consultations
43 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More