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Nanoporous SiO 2 / Si thin layers produced by ion track etching : dependence on the ion energy and criterion for etchability

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Nanoporous SiO 2 / Si thin layers produced by ion track etching : dependence on the ion energy and criterion for etchability

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Título Nanoporous SiO 2 / Si thin layers produced by ion track etching : dependence on the ion energy and criterion for etchability
Autor Dallanora, Arícia Oliveira
Marcondes, Tatiana Lisbôa
Bermudez, Gerardo
Fichtner, Paulo Fernando Papaleo
Trautmann, C.
Toulemonde, M.
Papaleo, Ricardo Meurer
Abstract Vitreous SiO2 thin films thermally grown onto Si wafers were bombarded by Au ions with energies from 0.005 to 11.1 MeV/u and by ions at constant velocity 0.1 MeV/u 197Au, 130Te, 75As, 32S, and 19F . Subsequent chemical etching produced conical holes in the films with apertures from a few tens to 150 nm. The diameter and the cone angle of the holes were determined as a function of energy loss of the ions. Preferential track etching requires a critical electronic stopping power Se th 2 keV/nm, independent of the value of the nuclear stopping. However, homogeneous etching, characterized by small cone opening angles and narrow distributions of pore sizes and associated with a continuous trail of critical damage, is only reached for Se 4 keV/nm. The evolution of the etched-track dimensions as a function of specific energy or electronic stopping force can be described by the inelastic thermal spike model, assuming that the etchable track results from the quenching of a zone which contains sufficient energy for melting. The model correctly predicts the threshold for the appearance of track etching Se th if the radius of the molten region has at least 1.6 nm. Homogeneous etching comes out only for latent track radii larger than 3 nm.
Contido em Journal of applied physics. Melville, NY. Vol. 104, no. 2 (July 2008), p. 024307-1 a 024307-8
Assunto Dióxido de silício
Eletrodeposição
Ions
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/117995
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