학술논문
Catalyst-free growth of amorphous silicon nanowires by laser ablation.
Document Type
Article
Author
Source
Subject
*AMORPHOUS silicon
*SILICON nanowires
*LASER ablation
*CATALYSIS
*TEMPERATURE effect
*VAPOR-liquid equilibrium
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Language
ISSN
0947-8396
Abstract
Amorphous silicon nanowires (NWs), 3-50 nm thick and up to 4 μm long, were grown by room-temperature continuous wave laser ablation of Si in high-pressure (0.1-0.9 MPa) Ar gas without the addition of any catalysts. The diameter and length of the NWs increased as the pressures of the ambient Ar increased. Sphere-like Si particles with diameters of 4-110 nm were observed at the tips of grown NWs and their diameters exhibited a strong correlation with the NW diameters. We propose a stress-driven self-catalytic vapor-liquid-solid mechanism to explain the growth of the NWs. [ABSTRACT FROM AUTHOR]