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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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Sadhanala, Aditya
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (29/29 displayed)
- 2021Ligand-engineered bandgap stability in mixed-halide perovskite LEDscitations
- 2020Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron-Deficient Polymer Processed by Solution Shear Coating.
- 2020Role of Morphology and Förster Resonance Energy Transfer in Ternary Blend Organic Solar Cellscitations
- 2019High-mobility, trap-free charge transport in conjugated polymer diodescitations
- 2019Charge extraction via graded doping of hole transport layers gives highly luminescent and stable metal halide perovskite devices.
- 2019Triple-Cation-Based Perovskite Photocathodes with AZO Protective Layer for Hydrogen Production Applications.
- 2018Electroluminescence from Solution-Processed Pinhole-Free Nanometer-Thickness Layers of Conjugated Polymers.
- 2018Lead-Free Perovskite Semiconductors Based on Germanium-Tin Solid Solutions:Structural and Optoelectronic Propertiescitations
- 2018Dedoping of Lead Halide Perovskites Incorporating Monovalent Cations.
- 2018Lead-Free Perovskite Semiconductors Based on Germanium-Tin Solid Solutionscitations
- 2018Stable Light-Emitting Diodes Using Phase-Pure Ruddlesden–Popper Layered Perovskitescitations
- 2018Direct Bandgap Behavior in Rashba-Type Metal Halide Perovskites.
- 2018Exciton-Phonon Interactions Govern Charge-Transfer-State Dynamics in CdSe/CdTe Two-Dimensional Colloidal Heterostructures.
- 2017Understanding charge transport in lead iodide perovskite thin-film field-effect transistorscitations
- 2017High operational and environmental stability of high-mobility conjugated polymer field-effect transistors through the use of molecular additives.
- 2017Organic Cation Rotation and Immobilization in Pure and Mixed Methylammonium Lead-Halide Perovskitescitations
- 2017Correlation of Disorder and Charge Transport in a Range of Indacenodithiophene-Based Semiconducting Polymerscitations
- 2016High operational and environmental stability of high-mobility conjugated polymer field-effect transistors through the use of molecular additivescitations
- 2016Coulomb Enhanced Charge Transport in Semicrystalline Polymer Semiconductorscitations
- 2016What Controls the Rate of Ultrafast Charge Transfer and Charge Separation Efficiency in Organic Photovoltaic Blends.
- 2015Phosphonic anchoring groups in organic dyes for solid-state solar cellscitations
- 2015Phosphonic anchoring groups in organic dyes for solid-state solar cellscitations
- 2015Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes.
- 2015Role of PbSe Structural Stabilization in Photovoltaic Cellscitations
- 2015Hot-carrier cooling and photoinduced refractive index changes in organic-inorganic lead halide perovskites.
- 2015Local Versus Long-Range Diffusion Effects of Photoexcited States on Radiative Recombination in Organic-Inorganic Lead Halide Perovskites.
- 2014Approaching disorder-free transport in high-mobility conjugated polymers.
- 2014Lead-free organic–inorganic tin halide perovskites for photovoltaic applicationscitations
- 2014Bright light-emitting diodes based on organometal halide perovskite.
Places of action
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article
Dedoping of Lead Halide Perovskites Incorporating Monovalent Cations.
Abstract
We report significant improvements in the optoelectronic properties of lead halide perovskites with the addition of monovalent ions with ionic radii close to Pb2+. We investigate the chemical distribution and electronic structure of solution processed CH3NH3PbI3 perovskite structures containing Na+, Cu+, and Ag+, which are lower valence metal ions than Pb2+ but have similar ionic radii. Synchrotron X-ray diffraction reveals a pronounced shift in the main perovskite peaks for the monovalent cation-based films, suggesting incorporation of these cations into the perovskite lattice as well as a preferential crystal growth in Ag+ containing perovskite structures. Furthermore, the synchrotron X-ray photoelectron measurements show a significant change in the valence band position for Cu- and Ag-doped films, although the perovskite bandgap remains the same, indicating a shift in the Fermi level position toward the middle of the bandgap. Such a shift infers that incorporation of these monovalent cations dedope the n-type perovskite films when formed without added cations. This dedoping effect leads to cleaner bandgaps as reflected by the lower energetic disorder in the monovalent cation-doped perovskite thin films as compared to pristine films. We also find that in contrast to Ag+ and Cu+, Na+ locates mainly at the grain boundaries and surfaces. Our theoretical calculations confirm the observed shifts in X-ray diffraction peaks and Fermi level as well as absence of intrabandgap states upon energetically favorable doping of perovskite lattice by the monovalent cations. We also model a significant change in the local structure, chemical bonding of metal-halide, and the electronic structure in the doped perovskites. In summary, our work highlights the local chemistry and influence of monovalent cation dopants on crystallization and the electronic structure in the doped perovskite thin films. ; Cambridge Materails Limited, Nava Technology Limited