title: Dielectric confinement of excitons in type-I and type-II semiconductor nanorods.
abstract: We theoretically study the effect of the dielectric environment on the exciton ground state of CdSe and CdTe/CdSe/CdTe nanorods. We show that insulating environments enhance the exciton recombination rate and blueshift the emission peak by tens of meV. These effects are particularly pronounced for type-II nanorods. In these structures, the dielectric confinement may even modify the spatial distribution of the electron and hole charges. A critical electric field is required to separate electrons from holes, whose value increases with the insulating strength of the surroundings.
authors.affiliation: Departament de Química Física i Analítica, Universitat Jaume I, E-12080, Castelló, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Royo
authors.forename: J I
authors.initials: JI
authors.lastname: Climente
authors.forename: J L
authors.initials: JL
authors.lastname: Movilla
authors.forename: J
authors.initials: J
authors.lastname: Planelles
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D017097:Electric Impedance; D004583:Electrons; D043942:Nanotubes / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry; D012666:Semiconductors; D013691:Tellurium / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; D013691:Tellurium; C028337:cadmium telluride