Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4903475
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- French National Research Agency (ANR) NOODLES [ANR-13-NANO-0009-02]
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Recent experimental works have shown that Ge/Si core/shell nanowires (NWs) are very attractive for nanoelectronics and for low-temperature quantum devices, thanks to the confinement of holes in the Ge core. Reported hole mobilities of the order of 200 cm(2)/V/s are promising for high-performance field-effect transistors. However, we demonstrate that mobilities more than ten times higher, up to 8000 cm(2)/V/s, could be reached in Ge/Si NWs. Atomistic calculations reveal the considerable influence of the strains induced by the Si shell on the hole transport, whatever the NW orientation. The enhancement of electron-phonon interactions by confinement, which usually degrades the mobility in NWs, is therefore outbalanced by the effect of strains. (C) 2014 AIP Publishing LLC.
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