Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 8, Pages 2062-2069Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b00212
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Funding
- NSF Graduate Research Fellowship [DGE-1256082]
- International Max Planck Research School (IMPRS)
- DOE BES [DE-SC0013957]
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We study the impact of excitation energy on the photostability of methylammonium lead triiodide (CH3NH3PbI3 or MAPI) perovskite thin films. Light soaking leads to a transient increase of the photoluminescence efficiency at excitation wavelengths longer than 520 nm, whereas light-induced degradation occurs when exciting the films with wavelengths shorter than 520 nm. X-ray diffraction and extinction measurements reveal the light-induced decomposition of CH3NH3PbI3 to lead iodide (PbI2) for the high-energy excitation regime. We propose a model explaining the energy dependence of the photostability that involves the photoexcitation of residual PbI2 species in the perovskite triggering the decomposition of CH3NH3PbI3.
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