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• W2947912685 abstract "The growth of regular arrays of uniform III–V semiconductor nanowires is a crucial step on the route toward their application-relevant large-scale integration onto the Si platform. To this end, not only does optimal vertical yield, length, and diameter uniformity have to be engineered, but also, control over the nanowire crystal structure has to be achieved. Depending on the particular application, nanowire arrays with varying area density are required for optimal device efficiency. However, the nanowire area density substantially influences the nanowire growth and presents an additional challenge for nanowire device engineering. We report on the simultaneous in situ X-ray investigation of regular GaAs nanowire arrays with different area density during self-catalyzed vapor–liquid–solid growth on Si by molecular-beam epitaxy. Our results give novel insight into selective-area growth and demonstrate that shadowing of the Ga flux, occurring in dense nanowire arrays, has a crucial impact on the evolution of nanowire crystal structure. We observe that the onset of Ga flux shadowing, dependent on array pitch and nanowire length, is accompanied by an increase of the wurtzite formation rate. Our results moreover reveal the paramount role of the secondary reflected Ga flux for VLS NW growth (specifically, that flux that is reflected directly into the liquid Ga droplet)." @default.
• W2947912685 created "2019-06-07" @default.
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• W2947912685 date "2019-05-31" @default.
• W2947912685 modified "2023-09-29" @default.
• W2947912685 title "Impact of the Shadowing Effect on the Crystal Structure of Patterned Self-Catalyzed GaAs Nanowires" @default.
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• W2947912685 doi "https://doi.org/10.1021/acs.nanolett.9b00380" @default.
• W2947912685 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31150261" @default.
• W2947912685 hasPublicationYear "2019" @default.
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