Tomographic analysis of dilute impurities in semiconductor nanostructures
| Autor: | Daniel E. Perea, Lincoln J. Lauhon, Edy Wijaya, Jessica L. Lensch-Falk, Eric R. Hemesath |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Dopant business.industry Doping Analytical chemistry Nanowire chemistry.chemical_element Germanium Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Semiconductor chemistry Impurity Laser cooling Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Vapor–liquid–solid method business |
| Zdroj: | Journal of Solid State Chemistry. 181:1642-1649 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2008.06.007 |
| Popis: | We describe the application of pulsed-laser atom probe (PLAP) tomography to the analysis of dopants and unintentional impurities in Si and Ge nanowires grown by the vapor–liquid–solid mechanism. PLAP tomography was used to determine the concentration of phosphorous in Ge nanowires and B in Si nanowires, enabling comparisons of the atomic concentrations of the reactants with those of the reaction products. Oxygen impurities were also detected, but the contribution from background gas adsorption was not ruled out. Gold catalyst impurities were not detected, and an upper bound of 5 ppm was established. Intrinsic and extrinsic origins of the detection limits of dopants and other impurities are described in detail. A tapered nanowire geometry was found to improve the mass resolution and signal-to-noise ratio by increasing the tip cooling rate. Simulations of nanowire cooling under laser pulsing were used to validate this improved approach to PLAP analysis of nanowires. |
| Databáze: | OpenAIRE |
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