Semiempirical supercell approach to calculate the electronic and optical properties of Si quantum wires

A. Miranda, D. Guzmán, H. M. Peréz-Meana, M. Cruz-Irisson

Research output: Contribution to conferencePaper

Abstract

Energy band gap and optical absorption of [001] oriented Si nanowires with diverse square cross-sections are calculated by using the sp3s* semi-empirical tight-binding (TB) model with a supercell approach. Each surface dangling bond is saturated with a hydrogen atom. The results of the variation band gap are compared with those obtained by TB-sp3d 5s*, the density functional theory, and experimental data in agreement with the quantum confinement scheme. The imaginary part of the dielectric function is calculated by using the interconnected and free standing (without interconnection) models for the Si skeleton. This microscopic supercell model predicts the low frequency tail in the absorption spectrum, which appears even without the allowance for the indirect optical transitions.
Original languageAmerican English
Pages220-224
Number of pages197
StatePublished - 1 Jan 2007
EventRevista Mexicana de Fisica -
Duration: 1 Jan 2007 → …

Conference

ConferenceRevista Mexicana de Fisica
Period1/01/07 → …

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