Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The current interest in materials with a nanoscopic 2D honeycomb geometry is due to their unique optoelectronic properties. We synthesized semiconductors with this geometry by oriented attachment of colloidal lead selenide (PbSe) nanocrystals. [1,3] Tight-binding calculations predict that these materials have the conventional band gap of a semiconductor, however with Dirac cones for the conduction electrons and valence holes. [2] Recently, we succeeded in increasing the number of building block options for the oriented attachment procedure to PbX nanocrystals, where X can be S, Se or Te.
All these different PbX nanocrystals can form the same 2D honeycomb structure and other 2D or 1D nanoperiodic structures, such as square, linear and zigzag structures. Still, the different nanocrystals exhibit subtle differences in the way they form these structures. Linear and zigzag structures are formed far more often with decreasing atomic number in the PbX’s chalcogenide (X); in contrast, the reactivity of the nanocrystals increases with increasing atomic number in the PbX’s chalcogenide. Moreover, the synthesis of the PbX superstructures can be combined with cation exchange under preservation of the nanogeometry. This way, the exotic superlattice properties can be combined with many different material properties, e.g. the high spin-orbit coupling of HgX compounds or the optical bandgap of CdX compounds.
References
1. Nano Lett., doi:10.1021/nl303322k
2. Phys. Rev. X, doi:10.1103/PhysRevX.4.011010
3. Science, doi:10.1126/science.1252642
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