Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling Skibinsky Gitlin, Erik Sebastian Rodríguez Bolívar, Salvador Califano, Marco Gómez Campos, Francisco Manuel 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 nanocrystalbased intermediate-band solar cells. 2020-02-12T08:09:06Z 2020-02-12T08:09:06Z 2019-11-25 info:eu-repo/semantics/article Skibinsky-Gitlin, E. S., Rodríguez-Bolívar, S., Califano, M., & Gómez-Campos, F. M. (2020). Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling. Nanoscale Adv., 2020, 2, 384 http://hdl.handle.net/10481/59589 10.1039/c9na00647h eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Royal Society of Chemistry