From Si Nanowires to Porous Silicon: The Role of Excitonic Effects

Mauro Bruno, Maurizia Palummo, Andrea Marini, Rodolfo Del Sole, and Stefano Ossicini
Phys. Rev. Lett. 98, 036807 – Published 17 January 2007

Abstract

We show that the electronic and optical properties of silicon nanowires, with different size and orientation, are dominated by important many-body effects. The electronic and excitonic gaps, calculated within first principles, agree with the available experimental data. Huge excitonic effects, which depend strongly on wire orientation and size, characterize the optical spectra. Modeling porous silicon as a collection of interacting nanowires, we find an absorption spectrum which is in very good agreement with experimental measurements only when the electron-hole interaction is included.

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  • Received 27 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.036807

©2007 American Physical Society

Authors & Affiliations

Mauro Bruno1, Maurizia Palummo1, Andrea Marini1, Rodolfo Del Sole1, and Stefano Ossicini2

  • 1European Theoretical Spectroscopy Facility (ETSF), CNR-INFM Institute for Statistical Mechanics and Complexity, CNISM and Dipartimento di Fisica, Universitá di Roma “Tor Vergata,” via della Ricerca Scientifica 1, 00133 Roma, Italy
  • 2CNR-INFM-S “NanoStructures and BioSystems at Surfaces,” and Dipartimento di Scienze e Metodi dell Ingegneria, Università di Modena e Reggio Emilia, via Amendola 2, Padiglione Morselli, I-42100 Reggio Emilia, Italy

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Issue

Vol. 98, Iss. 3 — 19 January 2007

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