abstract: In this project, a novel method is presented for measuring the resistivity of nanoscale metallic conductors (nanowires) using a variable-spacing 2-point method with a modified ultrahigh vacuum scanning tunneling microscope. An auxiliary field emission imaging method that allows for scanning insulating surfaces using a large gap distance (20nm) is also presented. Using these methods, the resistivity of self-assembled endotaxial FeSi2 nanowires (NWs) on Si(110) was measured. The resistivity was found to vary inversely with NW width, being rhoNW = 200 uOhm cm at 12 nm and 300 uOhm cm at 2 nm. The increase at small w is attributed to boundary scattering, and is fit to the Fuchs-Sondheimer model, yielding values of rho0 = 150 uOhm cm and lambda = 2.4 nm, for specularity parameter p = 0.5. These results are attributed to a high concentration of point defects in the FeSi2 structure, with a correspondingly short inelastic electron scattering length. It is remarkable that the defect concentration persists in very small structures, and is not changed by surface oxidation. / Dissertation/Thesis / Ph.D. Physics 2011
| Identifer | oai:union.ndltd.org:asu.edu/item:9507 |
| Date | January 2011 |
| Contributors | Tobler, Samuel (Author), Bennett, Peter (Advisor), Mccartney, Martha (Committee member), Tao, Nongjian (Committee member), Doak, Bruce (Committee member), Chen, Tingyong (Committee member), Arizona State University (Publisher) |
| Source Sets | Arizona State University |
| Language | English |
| Detected Language | English |
| Type | Doctoral Dissertation |
| Format | 113 pages |
| Rights | http://rightsstatements.org/vocab/InC/1.0/, All Rights Reserved |
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