Studies of Self-Organized Nanostructures on InP(111) Surfaces After Low Energy Ar+ Ion Irradiation

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Abstract:

We report formation of self organized InP nano dots using 3 keV Ar+ ion sputtering, at 15° incidence from surface normal, on InP(111) surface. Morphology and optical properties of the sputtered surface, as a function of sputtering time, have been investigated by Scanning Probe Microscopy and Raman Scattering techniques. Uniform patterns of nano dots are observed for different durations of sputtering. The sizes and the heights of these nano dots vary between 10 to 100 nm and 20 to 40 nm, respectively. With increasing of sputtering time, t, the size and height of these nano dots increases up to a certain sputtering time tc. However beyond tc, the dots break down into smaller nanostructures, and as a result, the size and height of these nanostructures decrease. The uniformity and regularity of these structures are also lost for sputtering beyond tc. The crossover behavior is also observed in the rms surface roughness. Raman investigations of InP nano dots reveal optical phonon softening due to phonon confinement in the surface nano dots.

Keywords: ATOMIC FORCE MICROSCOPE; III-V SEMICONDUCTORS; ION BEAM; NANOSCALE PATTERN FORMATION; SPUTTERING

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2008.AN27

Publication date: August 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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