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Size reduction-induced changes in the electron and phonon spectra of Ge nanostructures in the early stages of growth

  • P. Tognini
  • A. Stella
  • P. Cheyssac
  • R. Kofman
  • C. E. Bottani
Conference paper

Abstract

An optical study of the early stages of growth of Ge nanoparticles embedded in amorphous alumina matrix is presented here. The growth technique is based on a surface tension-driven aggregation process, which presents some similarities with the stress-driven heteroepitaxy technique. The experimental findings (from near UV to far IR, i.e., from electronic to phononic structures) can be interpreted in terms of the presence of a wetting layer together with the nanoparticles when the deposited Ge quantity is below a given value. This layer disappears when the Ge quantity is sufficiently high and the coalescence aggregation becomes the dominant process.

PACS

78.66.-w Optical properties of specific thin films, surfaces, and low-dimensional structures: superlattices, quantum well structures, multilayers, and microparticles 81.10.Bk Growth from vapor 68.65.+g Low dimensional structures (superlattices, quantum well structures, multilayers): structure and nanoelectronic properties 78.30.-j Infrared and Raman spectra 

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Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • P. Tognini
    • 1
  • A. Stella
    • 1
  • P. Cheyssac
    • 2
  • R. Kofman
    • 2
  • C. E. Bottani
    • 3
  1. 1.INFM — Dipartimento di Fisica “A. Volta”Università di PaviaPaviaItaly
  2. 2.Laboratoire de Physique de la Matière Condensée, UMR 6622Université de Nice-Sophia AntipolisNice Cedex 2France
  3. 3.INFM — Dipartimento di Ingegneria NuclearePolitecnico di MilanoMilanoItaly

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