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Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling

Abstract

We present a theoretical study at the atomistic level of the optical properties of semiconductor nanocrystal films. We investigate the dependence of the absorption coefficient on size, inter-dot separation, surface stoichiometry and morphology, temperature, position of the Fermi level and light polarization. Our results show that, counter-intuitively, huge blue shifts are expected in some intra-band transitions for strongly coupled arrays, in contrast with the predicted and observed red shift of the band gap absorption in such systems. Furthermore, we find that the energies of such transitions can be tuned within a range of several hundreds of meV, just by engineering the inter-dot separation in the film through the choice of appropriately sized capping ligands. Finally we discuss the application of this effect to nanocrystal-based intermediate-band solar cells.

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Publication details

The article was received on 11 Oct 2019, accepted on 24 Nov 2019 and first published on 25 Nov 2019


Article type: Paper
DOI: 10.1039/C9NA00647H
Nanoscale Adv., 2019, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling

    E. Skibinsky-Gitlin, S. Rodríguez-Bolívar, M. Califano and F. M. Gomez Campos, Nanoscale Adv., 2019, Accepted Manuscript , DOI: 10.1039/C9NA00647H

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