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

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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.

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

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Article information


Submitted
11 Oct 2019
Accepted
24 Nov 2019
First published
25 Nov 2019

This article is Open Access

Nanoscale Adv., 2020, Advance Article
Article type
Paper

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

E. S. Skibinsky-Gitlin, S. Rodríguez-Bolívar, M. Califano and F. M. Gómez-Campos, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/C9NA00647H

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