Does desorption affect the length distributions of nanowires?
Autor: | Vladimir G. Dubrovskii, Jelena Vukajlovic-Plestina, A. Fontcuberta i Morral, Wonjong Kim, J Barcus |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Gaussian Nanowire Nucleation Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Molecular physics self-catalyzed iii-v nanowires symbols.namesake Desorption growth modeling gaas General Materials Science Electrical and Electronic Engineering Surface diffusion Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology group v desorption 0104 chemical sciences Deposition rate Reflection (mathematics) Mechanics of Materials self-catalyzed growth symbols length distribution Length distribution 0210 nano-technology |
Zdroj: | Nanotechnology |
ISSN: | 1361-6528 0957-4484 |
Popis: | State-of-the art models for statistical properties within the nanowire ensembles consider influx of precursors, reflection and surface diffusion of adatoms. These models predict a delay in the nanowire growth start and the evolution toward an asymmetric length distribution. We demonstrate here the effect of desorption of the nanowire material, which has not been considered so far in studies of the nanowire length distributions. We show that at the very beginning of growth the length distribution should be asymmetric due to the slow nucleation of nanowires. At longer times, the length distribution acquires a symmetric Gaussian shape due to the increased weight of desorption. The width of this distribution is larger than Poissonian and increases for higher ratio of desorption over deposition rate. Our model is consistent with the length evolution of organized self-catalyzed GaAs nanowires. We outline that desorption of the nanowire material should be minimized to achieve arrays of highly identical nanowires. These results are relevant for a wide variety of material systems. |
Databáze: | OpenAIRE |
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