Biexcitons in CdSe nanoplatelets: geometry, binding energy and radiative rate
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INVESTIGACIONMetadades
Títol
Biexcitons in CdSe nanoplatelets: geometry, binding energy and radiative rateData de publicació
2022-05-13Editor
Royal Society of ChemistryISSN
2040-3364; 2040-3372Cita bibliogràfica
Macias-Pinilla, D. F., Planelles, J., & Climente, J. I. (2022). Biexcitons in CdSe nanoplatelets: geometry, binding energy and radiative rate. Nanoscale, 14(23)Tipus de document
info:eu-repo/semantics/articleVersió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
Biexciton properties in semiconductor nanostructures are highly sensitive to quantum confinement, relative electron–hole masses, dielectric environment and Coulomb correlations. Here we present a variational Quantum ... [+]
Biexciton properties in semiconductor nanostructures are highly sensitive to quantum confinement, relative electron–hole masses, dielectric environment and Coulomb correlations. Here we present a variational Quantum Monte Carlo model which, coupled to effective mass Hamiltonians, takes into account all of the above effects. The model is used to provide theoretical assessment on the biexciton ground state properties in colloidal CdSe nanoplatelets. A number of characteristic features is observed: (i) the finite thickness of these systems makes the biexciton geometry depart from the planar square expected in the two-dimensional (2D) limit, and form a distorted tetrahedron instead; (ii) the strong dielectric confinement enhances not only Coulomb attractions but also repulsions, which lowers the ratio of the biexciton-to-exciton binding energy down to EXXb/EXb = 0.07. (iii) EXXb is less sensitive than EXb to lateral confinement, and yet it can reach values above 30 meV, thus granting room temperature stability; (iv) the ratio of biexciton-to-exciton radiative rates, kradXX/kradX, decreases from 3.5 to ∼1 as the platelet area increases. These results pave the way for the rational design of biexciton properties in metal chalcogenide nanoplatelets. [-]
Publicat a
Nanoscale, Issue 23 (2022)Entitat finançadora
Ministerio de asuntos económicos y transformación digital (MINECO) | European Research Council (ERC) | Generalitat Valenciana | Universitat Jaume I
Codi del projecte o subvenció
CTQ2017-83781-P | 724424-No-LIMIT | Prometeo/2018/098 | UJI B-2021-06
Títol del projecte o subvenció
Prometeo Grant Q-Devices
Drets d'accés
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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