Electronic states and optical properties of PbSe nanorods and nanowires
arXiv:1010.6047 · doi:10.1103/PhysRevB.82.195313
Abstract
A theory of the electronic structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically strengthens the exciton binding in narrow nanowires and nanorods. However, the self-interaction energies of the electron and hole nearly cancel the Coulomb binding, and as a result the optical absorption spectra are practically unaffected by the strong dielectric contrast between PbSe and the surrounding medium. Measurements of the size-dependent absorption spectra of colloidal PbSe nanorods are also presented. Using room-temperature energy-band parameters extracted from the optical spectra of spherical PbSe nanocrystals, the theory provides good quantitative agreement with the measured spectra.
35 pages, 12 figures
References in corpus (2)
Cited by in corpus (12)
- Hot-carrier optoelectronic devices based on semiconductor nanowires
- Few-body systems in condensed matter physics
- Atomistic study of electronic structure of PbSe nanowires
- Multiple Exciton Generation in Nanostructures for Advanced Photovoltaic Cells
- Interaction between interface and massive states in multivalley topological heterostructures
- Miniband engineering and topological phase transitions in topological - normal insulator superlattices
- Trions and biexcitons in a nanowire
- Valley and spin splittings in PbSe nanowires
- Hydrogen ionization equilibrium in magnetic fields
- Shape effect on the valley splitting in lead selenide nanowires
- Theory for electron and hole fine structure and Landé g-factors in lead chalcogenide nanowires
- Untangling the valley structure of states for intravalley exchange anisotropy in lead chalcogenides quantum dots