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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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Bein, Thomas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (27/27 displayed)
- 2024The balancing act between high electronic and low ionic transport influenced by perovskite grain boundariescitations
- 2024Contrasting ultra-low frequency Raman and infrared modes in emerging metal halides for photovoltaicscitations
- 2024Tunable Isometric Donor‐Acceptor Wurster‐Type Covalent Organic Framework Photocathodescitations
- 2023Cu/Ag–Sb–I Rudorffite Thin Films for Photovoltaic Applicationscitations
- 2022Silver-Bismuth Based 2D Double Perovskites (4FPEA)(4)AgBiX8 (X = Cl, Br, I): Highly Oriented Thin Films with Large Domain Sizes and Ultrafast Charge-Carrier Localizationcitations
- 2022Heterovalent Tin Alloying in Layered MA3Sb2I9 Thin Films: Assessing the Origin of Enhanced Absorption and Self-Stabilizing Charge Statescitations
- 2021Roadmap on organic-inorganic hybrid perovskite semiconductors and devicescitations
- 2021Increasing Photostability of Inverted Nonfullerene Organic Solar Cells by Using Fullerene Derivative Additivescitations
- 2021An Electrically Conducting Three‐Dimensional Iron–Catecholate Porous Frameworkcitations
- 20211,10-Phenanthroline as an Efficient Bifunctional Passivating Agent for MAPbI3 Perovskite Solar Cellscitations
- 2020Optoelectronic Properties of $Cs_{2}AgBiBr_{6}$ Thin Films: The Influence of Precursor Stoichiometrycitations
- 2020Cellulose Nanocrystal-Templated Tin Dioxide Thin Films for Gas Sensing.
- 2019Shedding Light on the Moisture Stability of 3D/2D Hybrid Perovskite Heterojunction Thin Filmscitations
- 2018Single-crystal-like optoelectronic-properties of MAPbI3 perovskite polycrystalline thin filmscitations
- 2017In situ study of spray deposited titania photoanodes for scalable fabrication of solid-state dye-sensitized solar cellscitations
- 2016Toward Tailored Film Morphologiescitations
- 2016Hybrid Perovskite/Perovskite Heterojunction Solar Cellscitations
- 2016Synthesis of Perfectly Oriented and Micrometer-Sized MAPbBr(3) Perovskite Crystals for Thin-Film Photovoltaic Applicationscitations
- 2016Spray Deposition of Titania Films with Incorporated Crystalline Nanoparticles for All-Solid-State Dye-Sensitized Solar Cells Using P3HTcitations
- 2015Reversible Hydration of CH3NH3Pbl3 in Films, Single Crystals, and Solar Cellscitations
- 2015Reversible hydration of CH3NH3PbI3 in films, single crystals, and solar cellscitations
- 2015A Closer Look into Two-Step Perovskite Conversion with X-ray Scatteringcitations
- 2014Tin doping speeds up hole transfer during light-driven water oxidation at hematite photoanodescitations
- 2014Bright light-emitting diodes based on organometal halide perovskite.
- 2014Influence of the orientation of methylammonium lead iodide perovskite crystals on solar cell performancecitations
- 2014Atomic-layer-deposited aluminum and zirconium oxides for surface passivation of TiO 2 in high-efficiency organic photovoltaicscitations
- 2013Formation of hexagonal and cubic fluorescent periodic mesoporous organosilicas in the channels of anodic alumina membranescitations
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>