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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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Weller, Mark T.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (39/39 displayed)
- 2023Anomalous Electron–Phonon Coupling in Cesium-Substituted Methylammonium Lead Iodide Perovskites
- 2023Photoelectrochemical performance of strontium titanium oxynitride photo-activated with cobalt phosphate nanoparticles for oxidation of alkaline watercitations
- 2023Using pressure to unravel the structure–dynamic-disorder relationship in metal halide perovskitescitations
- 2023Using pressure to unravel the structure-dynamic-disorder relationship in metal halide perovskitescitations
- 2021Photoluminescence of bound-exciton complexes and assignment to shallowdefects in methylammonium/formamidinium lead iodide mixed crystals
- 2020Phase behavior and substitution limit of mixed cesium-formamidinium lead triiodide perovskitescitations
- 2019Spectroscopic ellipsometry study of FAxMA1−xPbI3 hybrid perovskite single crystals
- 2018Pressure-Induced Locking of Methylammonium Cations versus Amorphization in Hybrid Lead Iodide Perovskitescitations
- 2018Pressure-Induced Locking of Methylammonium Cations versus Amorphization in Hybrid Lead Iodide Perovskites
- 2017Determination of the Hydrogen Positions in the Novel Barium Boroarsenate Ba[B2As2O8(OH)2] by Combined Single Crystal X-ray and Powder Neutron Investigationscitations
- 2016Efficient bi-functional electrocatalysts of strontium iron oxy-halides for oxygen evolution and reduction reactions in alkaline mediacitations
- 2015Reversible Hydration of CH3NH3Pbl3 in Films, Single Crystals, and Solar Cellscitations
- 2015Reversible hydration of CH3NH3PbI3 in films, single crystals, and solar cellscitations
- 2015The cubic perovskite structure of black formamidinium lead iodide, α-[HC(NH2)2]PbI3, at 298 Kcitations
- 2014Determining hydrogen positions in crystal engineered organic molecular complexes by joint neutron powder and single crystal X-ray diffractioncitations
- 2014Synthesis and structural characterisation of iron(II) and copper(II) diphosphates containing flattened metal oxotetrahedracitations
- 2014Direct observation of structural changes near and at the charge-ordering temperature of ilvaite using high-flux neutron powder diffraction
- 2014Neutron powder diffractioncitations
- 2013Iron fluorophosphatescitations
- 2013Manganese (III) fluorophosphate frameworkscitations
- 2012Probing hydrogen positions in hydrous compounds:information from parametric neutron powder diffraction studiescitations
- 2012Copper(II) fluorophosphatescitations
- 2012Probing hydrogen positions in hydrous compoundscitations
- 2012Cobalt (II) fluorophosphate frameworkscitations
- 2011Fluoride-rich, hydrofluorothermal routes to functional transition metal (Mn, Fe, Co, Cu) fluorophosphatescitations
- 2010Structural isotope effects in metal hydrides and deuteridescitations
- 2010The kinetics of bulk hydration of the disaccharides α-lactose and trehalose by in situ neutron powder diffractioncitations
- 2010Combined single-crystal X-ray and neutron powder diffraction structure analysis exemplified through full structure determinations of framework and layer beryllate mineralscitations
- 2009Synthesis and crystal structures of iron hydrogen phosphatescitations
- 2009Crystallography of hydrogen-containing compoundscitations
- 2009Crystallography of hydrogen-containing compounds: realizing the potential of neutron powder diffractioncitations
- 2009In situ neutron powder diffraction and structure determination in controlled humiditiescitations
- 2004Investigation of cancrinite structures by powder neutron diffractioncitations
- 2003The effect of calcium on phase formation in the sodium aluminium silicate carbonate system and the structure of NaCaSiO3OHcitations
- 2002Variable temperature powder neutron diffraction study of SmNiO3 through its M-I transition using a combination of samarium and nickel isotopic substitutioncitations
- 2002Crystal structures and magnetic properties of the manganese oxide chlorides Sr2MnO3Cl and Sr4Mn3O8-yCl2citations
- 2001New directions in synthetic and structural solid state chemistrycitations
- 2001Structural and Mössbauer study of Sr2FeO3X (X = F, Cl, Br) and the magnetic structure of Sr2FeO3Fcitations
- 2000Neutron and x-ray powder diffraction studies of the oxynitrides SrW(O,N)3, Ba3W2(O,N)8 and Ba3Mo2(O,N)8citations
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>