Control of Lateral Dimension
in Metal-Catalyzed Germanium
Nanowire Growth: Usage of Carbon Sheath
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Abstract
We report on the catalytic growth of thin carbon sheathed
single
crystal germanium nanowires (GeNWs), which can solve the obstacles
that have disturbed a wide range of applications of GeNWs. Single
crystal Ge NW core and amorphous carbon sheath are simultaneously
grown via vapor–liquid–solid (VLS) process. The carbon
sheath completely blocks unintentional vapor deposition on NW surface,
thus ensuring highly uniform diameter, dopant distribution, and electrical
conductivity along the entire NW length. Furthermore, the sheath not
only inhibits metal diffusion but also improves the chemical stability
of GeNWs at even high temperatures