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Degradation of Methylammonium Lead Iodide Perovskite Structures through Light and Electron Beam Driven Ion Migration
- 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
- Subjects :
- Materials science
Photoluminescence
Letter
Scanning electron microscope
Cathodoluminescence
Nanotechnology
Electrons
02 engineering and technology
Electron
010402 general chemistry
Microscopy, Atomic Force
01 natural sciences
law.invention
Methylamines
law
General Materials Science
Physical and Theoretical Chemistry
Perovskite (structure)
Titanium
[CHIM.MATE] Chemical Sciences/Material chemistry
Oxides
[CHIM.MATE]Chemical Sciences/Material chemistry
Calcium Compounds
Iodides
021001 nanoscience & nanotechnology
0104 chemical sciences
Lead
Chemical physics
Microscopy, Electron, Scanning
Electric current
Electron microscope
0210 nano-technology
Luminescence
Subjects
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⟩