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  • 1
    Language: English
    In: Journal of Applied Physics, 01 March 2011, Vol.109(5)
    Description: Self-organized nano-cone arrays are fabricated on Si (100) by means of Ar + ion bombardment at normal incidence with ion energy of 1.5 keV and current density of 1000 µA cm −2 . The nano-structured Si surface appears black as seen by the naked eye. The measured reflectance of the surface is less than 11% over the wavelength range from 350 to 2000 nm as compared to that of 〉∼30% for the polished Si. An enhancement of more than 25% in absorption is observed in this region. The cones are densely distributed over the surface with an average height of ∼350 nm and base width of ∼250 nm. Incorporation of metal atoms such as Fe and Cr is found to be mandatory for the formation of the nano-structures during ion bombardment. High-resolution electron spectra show that for each cone, the apex is metal-enriched, and the rest is nearly free of metal atoms, showing good crystallinity with the same crystallographic orientation as the substrate.
    Keywords: Articles
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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