Interface‐Driven Structural Distortions and Composition Segregation in Two‐Dimensional Heterostructures
| Autor: | Gavin Mitchson, David C. Johnson, Devin R. Merrill, Kiran Mathew, Richard G. Hennig, Jeffrey Ditto, Douglas L. Medlin, Joshua J. Gabriel, Nigel D. Browning |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Field (physics) Alloy 02 engineering and technology engineering.material 010402 general chemistry Crystal engineering 01 natural sciences Catalysis law.invention law Ab initio quantum chemistry methods Monolayer Bilayer Heterojunction General Chemistry General Medicine 021001 nanoscience & nanotechnology Layer thickness 0104 chemical sciences Crystallography Chemical physics engineering Electron microscope 0210 nano-technology Experimental challenge |
| Zdroj: | Angewandte Chemie. 129:14640-14644 |
| ISSN: | 1521-3757 0044-8249 |
| DOI: | 10.1002/ange.201707270 |
| Popis: | The discovery of emergent phenomena in two-dimensional (2D) materials has sparked substantial research efforts in the materials community. A significant experimental challenge for this field is exerting atomistic control over the structure and composition of the constituent 2D layers and understanding how the interactions between layers drives both structure and properties. Segregation of Pb to the surface of three bilayer thick PbSe-SnSe alloy layers was discovered within [(PbxSn1-xSe)1+δ]n(TiSe2)1 heterostructures using electron microscopy. We demonstrate that this segregation is thermodynamically favored to occur when PbxSn1-xSe layers are interdigitated with TiSe2 monolayers. Density-functional theory (DFT) calculations indicate that the observed segregation depends on what is adjacent to the PbxSn1-xSe layers. The interplay between interface and volume free energies controls both the structure and composition of the constituent layers, which can be tuned using layer thickness. |
| Databáze: | OpenAIRE |
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