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Atomic structure of metal-free and catalyzed Si nanowires

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Abstract

Metal-free and Au-catalyzed silicon nanowires (Si-NWs) grown at low temperatures have been analyzed through transmission electron microscopy (TEM) and scanning electron microscopy (SEM), and their crystalline phase studied. All the observed nanowires are crystalline, grow along two different directions, <110> or <112>, and contain high density of planar defects, such as stacking faults (SFs) and twins. The defect size is comparable to the wire diameter for the metal-free process whilst it is much larger than the wire diameter for the Aucatalyzed Si-NWs. In this latter case parallel SFs may re-arrange and transform in a metastable rhombohedral 9R polytype structure whose formation mechanism is discussed.

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Authors and Affiliations

  1. CNR-IMM of Catania Stradale, Primosole 50, I-95121, Catania, Italy

    Giuseppe Nicotra, Corrado Bongiorno & Corrado Spinella

  2. CNR-IMM of Rome via del Fosso del, Cavaliere 100, 00133, Rome, Italy

    Annalisa Convertino, Massimo Cuscunà & Faustino Martelli

Authors
  1. Giuseppe Nicotra
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  2. Corrado Bongiorno
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  3. Annalisa Convertino
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  4. Massimo Cuscunà
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  5. Faustino Martelli
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  6. Corrado Spinella
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Nicotra, G., Bongiorno, C., Convertino, A. et al. Atomic structure of metal-free and catalyzed Si nanowires. MRS Online Proceedings Library 1305, 204 (2011). https://doi.org/10.1557/opl.2011.296

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  • DOI: https://doi.org/10.1557/opl.2011.296

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