| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Campoy-Quiles, Mariano
European Commission
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024High Polymer Molecular Weight Yields Solar Cells with Simultaneously Improved Performance and Thermal Stabilitycitations
- 2024High Polymer Molecular Weight Yields Solar Cells with Simultaneously Improved Performance and Thermal Stabilitycitations
- 2024Using spatial confinement to decipher polymorphism in the organic semiconductor p-DTS(FBTTh2)2citations
- 2024Electrically Programmed Doping Gradients Optimize the Thermoelectric Power Factor of a Conjugated Polymercitations
- 2024A Universal, Highly Stable Dopant System for Organic Semiconductors Based on Lewis-Paired Dopant Complexes
- 2024Impact of Oligoether Side-Chain Length on the Thermoelectric Properties of a Polar Polythiophenecitations
- 2023Laminated Organic Photovoltaic Modules for Agrivoltaics and Beyond: An Outdoor Stability Study of All-Polymer and Polymer:Small Molecule Blendscitations
- 2023In-plane thermal diffusivity determination using beam-offset frequency-domain thermoreflectance with a one-dimensional optical heat sourcecitations
- 2022Unraveling the Influence of the Preexisting Molecular Order on the Crystallization of Semiconducting Semicrystalline Poly(9,9-di‑n‑octylfluorenyl-2,7-diyl (PFO)citations
- 2022Comparing the microstructure and photovoltaic performance of 3 perylene imide acceptors with similar energy levels but different packing tendenciescitations
- 2022Comparing the Microstructure and Photovoltaic Performance of 3 Perylene Imide Acceptors With Similar Energy Levels but Different Packing Tendenciescitations
- 2020Microfluidic-Assisted Blade Coating of Compositional Libraries for Combinatorial Applications: The Case of Organic Photovoltaicscitations
- 2020Reply to the “Comment on the publication ‘Ferroelectricity-free lead halide perovskites’ by Gomez ” by Colsmanncitations
- 2019Solar Harvesting: a Unique Opportunity for Organic Thermoelectrics?citations
- 2018Pressure-Induced Locking of Methylammonium Cations versus Amorphization in Hybrid Lead Iodide Perovskitescitations
- 2017A Solution-Doped Polymer Semiconductor : Insulator Blend for Thermoelectricscitations
- 2016A Solution-Doped Polymer Semiconductor:Insulator Blend for Thermoelectricscitations
- 2015Vertical and lateral morphology effects on solar cell performance for a thiophene-quinoxaline copolymer : PC_{70}BM blendcitations
- 2015Reversible Hydration of CH3NH3Pbl3 in Films, Single Crystals, and Solar Cellscitations
- 2015Reversible hydration of CH3NH3PbI3 in films, single crystals, and solar cellscitations
Places of action
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article
Reversible hydration of CH3NH3PbI3 in films, single crystals, and solar cells
Abstract
<p>Solar cells composed of methylammonium lead iodide perovskite (MAPI) are notorious for their sensitivity to moisture. We show that (i) hydrated crystal phases are formed when MAPI is exposed to water vapor at room temperature and (ii) these phase changes are fully reversed when the material is subsequently dried. The reversible formation of CH3NH3PbI3·H2O followed by (CH3NH3)4PbI6·2H2O (upon long exposure times) was observed using time-resolved XRD and ellipsometry of thin films prepared using “solvent engineering”, single crystals, and state-of-the-art solar cells. In contrast to water vapor, the presence of liquid water results in the irreversible decomposition of MAPI to form PbI2. MAPI changes from dark brown to transparent on hydration; the precise optical constants of CH3NH3PbI3·H2O formed on single crystals were determined, with a bandgap at 3.1 eV. Using the single-crystal optical constants and thin-film ellipsometry measurements, the time-dependent changes to MAPI films exposed to moisture were modeled. The results suggest that the monohydrate phase forms independent of the depth in the film, suggesting rapid transport of water molecules along grain boundaries. Vapor-phase hydration of an unencapsulated solar cell (initially <i style="font-family: Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.3999996185303px; background-color: rgb(244, 249, 253);">J</i>sc ≈ 19 mA cm–2 and <i style="font-family: Helvetica, Arial, sans-serif; font-size: 14px; line-height: 22.3999996185303px; background-color: rgb(244, 249, 253);">V</i>oc ≈ 1.05 V at 1 sun) resulted in more than a 90% drop in short-circuit photocurrent and ∼200 mV loss in open-circuit potential; however, these losses were fully reversed after the device was exposed to dry nitrogen for 6 h. Hysteresis in the current–voltage characteristics was significantly increased after this dehydration, which may be related to changes in the defect density and morphology of MAPI following recrystallization from the hydrate. Based on our observations, we suggest that irreversible decomposition of MAPI in the presence of water vapor only occurs significantly once a grain has been fully converted to the monohydrate phase.</p>