Impact of Moisture on Photoexcited Charge Carrier Dynamics in Methylammonium Lead Halide Perovskites
| Autor: | Niraj Shrestha, Randy J. Ellingson, Adam B. Phillips, Michael J. Heben, Ramez Hosseinian Ahangharnejhad, Zhaoning Song, Geethika K. Liyanage, Suneth C. Watthage, Zahrah S. Almutawah |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoluminescence Passivation food and beverages Halide 02 engineering and technology Methylammonium lead halide 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry General Materials Science Charge carrier Relative humidity Physical and Theoretical Chemistry 0210 nano-technology Water vapor Perovskite (structure) |
| Zdroj: | The Journal of Physical Chemistry Letters. 9:6312-6320 |
| ISSN: | 1948-7185 |
| Popis: | Organic–inorganic metal halide perovskites are notoriously unstable in humid environments. While many studies have revealed the morphology and crystal structure changes that accompany exposure to humidity, little is known about changes to the photophysics that accompany the degradation process. By combining in situ steady-state and time-resolved photoluminescence with Hall effect measurements, we examined the changes in the photoexcited carrier dynamics for methylammonium lead iodide (MAPbI3) and bromide (MAPbBr3) films exposed to nitrogen gas containing water vapor at 80% relative humidity. The changes in the photophysics of MAPbI3 interacting with water follow a four-stage process, consisting of surface passivation, free electron doping, interfacial hydration, and bulk hydration. In contrast, MAPbBr3 exhibits only features associated with the first two stages, which occur at a faster rate. Our results elucidate the degradation mechanisms of perovskite films in high humidity from the perspective of the p... |
| Databáze: | OpenAIRE |
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