Dielectric confinement of excitons in type-I and type-II semiconductor nanorods

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 t...

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Bibliographic Details
Published inJournal of physics. Condensed matter Vol. 23; no. 1; pp. 015301 - 8
Main Authors Royo, M, Climente, J I, Movilla, J L, Planelles, J
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 12.01.2011
Institute of Physics
Subjects
Cadmium Compounds - chemistry
Cadmium selenides
Cadmium tellurides
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Confinement
Dielectrics
Electric Impedance
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic structure of nanoscale materials : clusters, nanoparticles, nanotubes, and nanocrystals
Electrons
Exact sciences and technology
Excitons
Nanocrystals and nanoparticles
Nanorods
Nanotubes - chemistry
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Physics
Selenium Compounds - chemistry
Semiconductors
Tellurium - chemistry
Confinement
Excitons
Spatial distribution
Semiconductor materials
Ground states
Electric field effects
Cadmium tellurides
Photoluminescence
Effective mass model
Spectral line shift
Nanorod
Cadmium selenides
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Summary: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.
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/1/015301