Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.049
Publication date: 23rd September 2021
Metal oxide nanocrystals doped with a few percent of aliovalent dopants become electronically conducting and support strong light-matter interactions in the infrared due to localized surface plasmon resonance (LSPR). In the prototypical material tin-doped indium oxide (ITO), we explored the influence of the spatial distribution of electrons on optical and electronic properties. In as-synthesized nanocrystals, electrons are largely confined to a plasmonic core, surrounded by an electron-depleted shell governed by the electronic states at the nanocrystal surface. Deliberately sequestering dopants in either the core or shell of the nanocrystals modulates the electrostatic landscape and shapes the plasmonic volume, including compression or expansion of the depletion layer. Core- or shell-doped nanocrystals exhibit multimodal optical spectra that respond strongly to changes in the dielectric environment. In thin films of nanocrystals, electronic conductivity is greatly enhanced in shell-doped nanocrystals wherein the barrier to nanocrystal-nanocrystal electron transfer is minimized.
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