Peer-Reviewed Journal Details
Mandatory Fields
Geaney, H,Mullane, E,Ramasse, QM,Ryan, KM
2013
January
Nano Letters
Atomically Abrupt Silicon-Germanium Axial Heterostructure Nanowires Synthesized in a Solvent Vapor Growth System
Published
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Optional Fields
Heterostructure nanowires silicon germanium interfacial abruptness solvent vapor growth aberration corrected STEM analysis SEMICONDUCTOR NANOWIRES DEFECT FORMATION SI NANOWIRES SOLAR-CELLS HIGH-YIELD CATALYST HETEROJUNCTIONS ELECTRONICS MORPHOLOGY ATOMS
13
1675
1680
The growth of Si/Ge axial heterostructure nanowires in high yield using a versatile wet chemical approach is reported. Heterostructure growth is achieved using the vapor zone of a high boiling point solvent as a reaction medium with an evaporated tin layer as the catalyst. The low solubility of Si and Ge within the Sn catalyst allows the formation of extremely abrupt heterojunctions of the order of just 1-2 atomic planes between the Si and Ge nanowire segments. The compositional abruptness was confirmed using aberration corrected scanning transmission electron microscopy and atomic level electron energy loss spectroscopy. Additional analysis focused on the role of crystallographic defects in determining interfacial abruptness and the preferential incorporation of metal catalyst atoms near twin defects in the nanowires.
10.1021/nl400146u
Grant Details