| 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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Groiss, H.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2020Materials Characterization / Correlative characterization of Zn-Al-Mg coatings by electron microscopy and FIB tomographycitations
- 2017Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystalscitations
- 2009Coherent {001} interfaces between rocksalt and zinc-blende crystal structurescitations
- 2009PbTe and SnTe quantum dot precipitates in a CdTe matrix fabricated by ion implantationcitations
- 2008Size-controlled quantum dots fabricated by precipitation of epitaxially grown, immiscible semiconductor heterosystemscitations
- 2007Quantum dots with coherent interfaces between rocksalt-PbTe and zincblende-CdTecitations
- 2007Size control and midinfrared emission of epitaxial PbTe/CdTe quantum dot precipitates grown by molecular beam epitaxycitations
- 2007The coherent {100} and {110} interfaces between rocksalt-PbTe and zincblende-CdTecitations
- 2007Structural and electronic properties of PbTe (rocksalt)/CdTe (zinc-blende) interfacescitations
- 2006Rebonding at coherent interfaces between rocksalt-PbTe/zinc-blende-CdTecitations
- 2006Centrosymmetric PbTe/CdTe quantum dots coherently embedded by epitaxial precipitationcitations
Places of action
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article
Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystals
Abstract
Epitaxial growth techniques enable nearly defect free heterostructures with coherent interfaces, which are of utmost importance for high performance electronic devices. While high-vacuum technology-based growth techniques are state-of-the art, here we pursue a purely solution processed approach to obtain nanocrystals with eptaxially coherent and quasi-lattice matched inorganic ligand shells. Octahedral metal-halide clusters, respectively 0-dimensional perovskites, were employed as ligands to match the coordination geometry of the PbS cubic rock-salt lattice. Different clusters (CH3NH3+)(6–x)[M(x+)Hal6](6–x)– (Mx+ = Pb(II), Bi(III), Mn(II), In(III), Hal = Cl, I) were attached to the nanocrystal surfaces via a scalable phase transfer procedure. The ligand attachment and coherence of the formed PbS/ligand core/shell interface was confirmed by combining the results from transmission electron microscopy, small-angle X-ray scattering, nuclear magnetic resonance spectroscopy and powder X-ray diffraction. The lattice mismatch between ligand shell and nanocrystal core plays a key role in performance. In photoconducting devices the best performance (detectivity of 2 × 1011 cm Hz 1/2/W with > 110 kHz bandwidth) was obtained with (CH3NH3)3BiI6 ligands, providing the smallest relative lattice mismatch of ca. −1%. PbS nanocrystals with such ligands exhibited in millimeter sized bulk samples in the form of pressed pellets a relatively high carrier mobility for nanocrystal solids of ∼1.3 cm2/(V s), a carrier lifetime of ∼70 μs, and a low residual carrier concentration of 2.6 × 1013 cm–3. Thus, by selection of ligands with appropriate geometry and bond lengths optimized quasi-epitaxial ligand shells were formed on nanocrystals, which are beneficial for applications in optoelectronics.