Electronic states and optical properties of PbSe nanorods and nanowires

Details Electronic states and optical properties of PbSe nanorods and nanowires Electronic states and optical properties of PbSe nanorods and nanowires

2010-10-28

arxiv.org/abs/1010.6047v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

35 pages, 12 figures

Scientific paper

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.

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