Number density and size distribution of droplets in KrF excimer laser deposited boron carbide films

This paper contributes to the old problem of droplet formation by providing detailed quantitative data on the population statistics of particulates deteriorating the surface of boron carbide films produced by PLD. Films of 180 ± 30 nm thicknesses have been fabricated by KrF excimer laser ablation of...

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Veröffentlicht in:Applied surface science 2005-07, Vol.247 (1), p.45-50
Hauptverfasser: Szörényi, T., Stuck, R., Antoni, F., Fogarassy, E.
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creator Szörényi, T.
Stuck, R.
Antoni, F.
Fogarassy, E.
description This paper contributes to the old problem of droplet formation by providing detailed quantitative data on the population statistics of particulates deteriorating the surface of boron carbide films produced by PLD. Films of 180 ± 30 nm thicknesses have been fabricated by KrF excimer laser ablation of a sintered B 4C target in high vacuum. Number densities and size distributions of the particulates are given for 14 films, deposited at laser fluences tuned between 2 and 14 J cm −2, as a result of evaluating SEM images of the same magnification taken from minimum five different areas (altogether (2–4) × 10 −2 mm 2) of each film. The overwhelming majority of the droplets is small with diameters, d ≤ 1 μm. The number density of those with d ≤ 0.5 μm ranges from (1 to 7) × 10 4 mm −2. The effect of gradual deterioration of the target surface as a result of prolonged irradiation screens practically totally the effect of changing fluence. The number of droplets of diameters in excess of 1 μm increases linearly with increasing number of shots/site resulting in maximum surface coverage values as high as 36%.
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Films of 180 ± 30 nm thicknesses have been fabricated by KrF excimer laser ablation of a sintered B 4C target in high vacuum. Number densities and size distributions of the particulates are given for 14 films, deposited at laser fluences tuned between 2 and 14 J cm −2, as a result of evaluating SEM images of the same magnification taken from minimum five different areas (altogether (2–4) × 10 −2 mm 2) of each film. The overwhelming majority of the droplets is small with diameters, d ≤ 1 μm. The number density of those with d ≤ 0.5 μm ranges from (1 to 7) × 10 4 mm −2. The effect of gradual deterioration of the target surface as a result of prolonged irradiation screens practically totally the effect of changing fluence. 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subjects B 4C
Boron carbide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Droplets
Electron and ion emission by liquids and solids
impact phenomena
Exact sciences and technology
Histograms
Impact phenomena (including electron spectra and sputtering)
Laser deposition
Laser-beam impact phenomena
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Particulates
Physics
PLD
Size distribution
Structure and morphology
thickness
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
Thin films
title Number density and size distribution of droplets in KrF excimer laser deposited boron carbide films
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