Au stabilization and coverage of sawtooth facets on Si nanowires grown by vapor-liquid-solid epitaxy

Nano Letters
Christian WiethoffFrank-J Meyer Zu Heringdorf

Abstract

Si nanowires grown in UHV by Au-catalyzed vapor-liquid-solid epitaxy are known to exhibit sidewalls with {112}-type orientation that show faceting. To understand the origin of the faceting, Au induced faceting on Si(112) surfaces was studied in situ by spot-profile-analyzing low-energy electron diffraction. With increasing Au coverage at 750 degrees C, the Si(112) surface undergoes various morphological transformations until, at a critical Au coverage of about 3.1 x 10 (14) atoms/cm (2), a phase consisting of large (111) and (113) facets forms, similar in structure to the nanowire sidewalls. This phase is stable at larger Au coverages in equilibrium with Au droplets. We suggest that Si nanowire surfaces exhibit this structure, and we derive the Au coverage on the two types of facets.

References

Nov 15, 1990·Physical Review. B, Condensed Matter·M Chester, T Gustafsson
Jun 1, 2001·Physical Review Letters·F J Meyer zu HeringdorfM Horn-von Hoegen
Oct 26, 2005·Physical Review Letters·F M RossM C Reuter
Jun 15, 2006·Nano Letters·Suneel KodambakaFrances M Ross
Jul 26, 2008·Nature Nanotechnology·Jonathan E AllenLincoln J Lauhon

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Citations

May 19, 2012·Nano Letters·Naechul Shin, Michael A Filler
Nov 6, 2015·Nano Letters·A D GamalskiE A Stach
Apr 5, 2016·Chemical Communications : Chem Comm·Yi-Chia ChouFrances M Ross
Sep 10, 2009·Nanotechnology·V A SivakovS H Christiansen
Nov 3, 2012·Chemical Society Reviews·Judith C YangRalph G Nuzzo
Jun 3, 2014·Nanoscale·S J RezvaniI Berbezier
Jan 17, 2012·Physical Review Letters·K W SchwarzF M Ross
Jan 8, 2011·ACS Nano·Oussama MoutanabbirMichael Horn-von Hoegen
Jun 30, 2011·Nanoscale Research Letters·Tao XuDidier Stiévenard

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