Back to Search Start Over

Degradation of Methylammonium Lead Iodide Perovskite Structures through Light and Electron Beam Driven Ion Migration

Authors :
Maarten B. J. Roeffaers
Gang Lu
Frans C. De Schryver
Emanuele Orgiu
Paolo Samorì
Hiroshi Uji-i
Christian Steuwe
Johan Hofkens
Haifeng Yuan
Kris P. F. Janssen
Hiroyuki Naiki
Michèle Moris
Elke Debroye
Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven)
Institut de Science et d'ingénierie supramoléculaires (ISIS)
Université de Strasbourg (UNISTRA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE)
Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique
Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
Hokkaido University [Sapporo, Japan]
univOAK, Archive ouverte
Source :
The Journal of Physical Chemistry Letters, Journal of Physical Chemistry Letters, Journal of Physical Chemistry Letters, 2016, 7 (3), pp.561-566. ⟨10.1021/acs.jpclett.5b02828⟩, Yuan, H, Debroye, E, Janssen, K, Naiki, H, Steuwe, C, Lu, G, Moris, M, Orgiu, E, Uji-i, H, De Schryver, F, Samorì, P, Hofkens, J & Roeffaers, M 2016, ' Degradation of methylammonium lead iodide perovskite structures through light and electron beam driven ion migration ', Journal of Physical Chemistry Letters, vol. 7, no. 3, pp. 561-566 . https://doi.org/10.1021/acs.jpclett.5b02828
Publication Year :
2016

Abstract

Organometal halide perovskites show promising features for cost-effective application in photovoltaics. The material instability remains a major obstacle to broad application because of the poorly understood degradation pathways. Here, we apply simultaneous luminescence and electron microscopy on perovskites for the first time, allowing us to monitor in situ morphology evolution and optical properties upon perovskite degradation. Interestingly, morphology, photoluminescence (PL), and cathodoluminescence of perovskite samples evolve differently upon degradation driven by electron beam (e-beam) or by light. A transversal electric current generated by a scanning electron beam leads to dramatic changes in PL and tunes the energy band gaps continuously alongside film thinning. In contrast, light-induced degradation results in material decomposition to scattered particles and shows little PL spectral shifts. The differences in degradation can be ascribed to different electric currents that drive ion migration. Moreover, solution-processed perovskite cuboids show heterogeneity in stability which is likely related to crystallinity and morphology. Our results reveal the essential role of ion migration in perovskite degradation and provide potential avenues to rationally enhance the stability of perovskite materials by reducing ion migration while improving morphology and crystallinity. It is worth noting that even moderate e-beam currents (86 pA) and acceleration voltages (10 kV) readily induce significant perovskite degradation and alter their optical properties. Therefore, attention has to be paid while characterizing such materials using scanning electron microscopy or transmission electron microscopy techniques. ispartof: Journal of Physical Chemistry Letters vol:7 issue:3 pages:561-566 ispartof: location:United States status: published

Details

ISSN :
19487185
Volume :
7
Issue :
3
Database :
OpenAIRE
Journal :
The journal of physical chemistry letters
Accession number :
edsair.doi.dedup.....d86a64730ec67e8491fcf18e46ebd7fa
Full Text :
https://doi.org/10.1021/acs.jpclett.5b02828⟩