Diameter-driven crossover in resistive behaviour of heavily doped self-seeded germanium nanowires

Connaughton, Stephen; Koleśnik-Gray, Maria M.; Hobbs, Richard G.; Lotty, Olan; Holmes, Justin D.; Krstić, Vojislav

Diameter-driven crossover in resistive behaviour of heavily doped self-seeded germanium nanowires

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Files

BJN_16-7-1284.pdf(398.7 KB)

Published Version

Date

2016-09-13

Authors

Connaughton, Stephen

Koleśnik-Gray, Maria M.

Hobbs, Richard G.

Lotty, Olan

Holmes, Justin D.

Krstić, Vojislav

Publisher

Beilstein-Institut

Published Version

10.3762/bjnano.7.119

Abstract

The dependence of the resistivity with changing diameter of heavily-doped self-seeded germanium nanowires was studied for the diameter range 40 to 11 nm. The experimental data reveal an initial strong reduction of the resistivity with diameter decrease. At about 20 nm a region of slowly varying resistivity emerges with a peak feature around 14 nm. For diameters above 20 nm, nanowires were found to be describable by classical means. For smaller diameters a quantum-based approach was required where we employed the 1D Kubo–Greenwood framework and also revealed the dominant charge carriers to be heavy holes. For both regimes the theoretical results and experimental data agree qualitatively well assuming a spatial spreading of the free holes towards the nanowire centre upon diameter reduction.

Keywords

Diameter-dependence , Germanium , Nanowire , Resistivity , Self-seeded

Citation

Connaughton, S., Koleśnik-Gray, M., Hobbs, R., Lotty, O., Holmes, J. D. & Krstić, V. (2016) ‘Diameter-driven crossover in resistive behaviour of heavily doped self-seeded germanium nanowires’, Beilstein Journal of Nanotechnology, 7, pp. 1284-1288. doi:10.3762/bjnano.7.119