Inspired by molecular chemistry, in which functionality of molecules depends on how atoms couple, we apply analogous concepts to enrich CQD-based materials. This, alongside with the ability to manipulate CQDs into more elaborate structures, naturally led to their consideration as “artificial atoms”. The strongly quantum confined energetic levels of CQDs possess atomic like character, for example- s and p states, related to their spherical symmetry. These are of direct relevance for numerous applications in displays, sensing, biological tagging and emerging quantum technologies.Ĭolloidal semiconductor quantum dots (CQDs) that contain hundreds to thousands of atoms have reached an exquisite level of control, side by side with gaining fundamental understanding of their size, composition, and surface-controlled properties leading to their implementation in technological applications 1. This sets the stage for nanocrystal chemistry to yield a diverse selection of coupled nanocrystal molecules constructed from controlled core/shell nanocrystal building blocks. Single nanoparticle spectroscopy unravels the attributes of coupled nanocrystal dimers related to the unique combination of quantum mechanical tunneling and energy transfer mechanisms. Coherent coupling and wave-function hybridization are manifested by a redshift of the band gap, in agreement with quantum mechanical simulations. The possible nanocrystal facets in which such fusion takes place are analyzed with atomic resolution revealing the distribution of possible crystal fusion scenarios. CdSe/CdS core/shell nanocrystals are linked to form dimers which are then fused via constrained oriented attachment. We utilize semiconductor nanocrystals as artificial atoms to form nanocrystal molecules that are structurally and electronically coupled. Coupling of atoms is the basis of chemistry, yielding the beauty and richness of molecules.
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