Advanced Energy Materials Laboratory

RESEARCH

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Functional Nanocrystals

Nanotechnology have attracted great attention from the scientific community during the last three decades due to their unique properties (i.e., electronic, optical, thermal, mechanical, and chemical properties). Researches on nanoscopic materials have shown spectacular advances in the methods of nanomaterial fabrication and utilizing their chemical composition, size, shape, and surface protection. Control over nanomaterial at the synthetic step is a straightforward way to obtain inorganic materials with specifically designed unique properties. The surface chemistry of nanomaterials is another key parameter, in various respects determining their properties related to their assembly. Their surface layer of organic capping functional ligands (typically thiols, amines, acids, phosphines) provides nanoparticles with solubility, stability, and processability. Our research group specifically focuses on functional nanomaterials and addresses their synthesis, functionalization, and their optoelectronic properties for the application.

QDs

Semiconductor quantum dots whose radii are smaller than the bulk exciton Bohr radius constitute a class of materials intermediate between molecular and bulk forms of matter. Quantum confinement of both the electron and hole in all three dimensions leads to an increase in the effective band gap of the material with decreasing size. Consequently, both the optical absorption and emission shift to the higher energies as the size of the dots gets smaller. Although quantum dots have not yet completed their evolution into bulk solids, structural studies indicate that they retain the bulk crystal structure and lattice parameter. Recent advances in the synthesis of highly monodisperse nanocrystallites have paved the way for numerous spectroscopic studies assigning the quantum dot electronic states and mapping out their evolution as a function of size.