Self-assembled Ge wires with a height of only 3 unit cells and a length of up to 2 micrometers were grown on Si(001) by means of a catalyst-free method based on molecular beam epitaxy. The wires grow horizontally along either the [100] or the [010] direction. On atomically flat surfaces, they exhibit a highly uniform, triangular cross section. A simple thermodynamic model accounts for the existence of a preferential base width for longitudinal expansion, in quantitative agreement with the experimental findings. Despite the absence of intentional doping, the first transistor-type devices made from single wires show low-resistive electrical contacts and single-hole transport at sub-Kelvin temperatures. In view of their exceptionally small and self-defined cross section, these Ge wires hold promise for the realization of hole systems with exotic properties and provide a new development route for silicon-based nanoelectronics.

Zhang, J., Katsaros, G., Montalenti, F., Scopece, D., Rezaev, R., Mickel, C., et al. (2012). Monolithic Growth of Ultrathin Ge Nanowires on Si(001). PHYSICAL REVIEW LETTERS, 109(8) [10.1103/PhysRevLett.109.085502].

Monolithic Growth of Ultrathin Ge Nanowires on Si(001)

MONTALENTI, FRANCESCO CIMBRO MATTIA;SCOPECE, DANIELE;MIGLIO, LEONIDA;
2012

Abstract

Self-assembled Ge wires with a height of only 3 unit cells and a length of up to 2 micrometers were grown on Si(001) by means of a catalyst-free method based on molecular beam epitaxy. The wires grow horizontally along either the [100] or the [010] direction. On atomically flat surfaces, they exhibit a highly uniform, triangular cross section. A simple thermodynamic model accounts for the existence of a preferential base width for longitudinal expansion, in quantitative agreement with the experimental findings. Despite the absence of intentional doping, the first transistor-type devices made from single wires show low-resistive electrical contacts and single-hole transport at sub-Kelvin temperatures. In view of their exceptionally small and self-defined cross section, these Ge wires hold promise for the realization of hole systems with exotic properties and provide a new development route for silicon-based nanoelectronics.
Articolo in rivista - Articolo scientifico
Heteroepitaxy; Growth; Nanostructures; Ge/Si
English
2012
109
8
085502
none
Zhang, J., Katsaros, G., Montalenti, F., Scopece, D., Rezaev, R., Mickel, C., et al. (2012). Monolithic Growth of Ultrathin Ge Nanowires on Si(001). PHYSICAL REVIEW LETTERS, 109(8) [10.1103/PhysRevLett.109.085502].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/35981
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