Optical properties of nanocrystal films: blue shifted transitions as signature of strong coupling
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Afficher la notice complèteAuteur
Skibinsky Gitlin, Erik Sebastian; Rodríguez Bolívar, Salvador; Califano, Marco; Gómez Campos, Francisco ManuelEditorial
Royal Society of Chemistry
Date
2019-11-25Referencia bibliográfica
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
Patrocinador
M. C. gratefully acknowledges financial support from the School of Electronic & Electrical Engineering, University of Leeds. F. M. G. C. and S. R. B. were supported by Project ENE2016_80944_R, funded by the Spanish Ministerio de Econom´ıa, Industria y Competitividad.Résumé
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.