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• W2022902566 abstract "A systematic Brillouin study has been carried out on acoustic modes in porous silicon films prepared from p-type Si(100). A surface Rayleigh mode and two bulk acoustic modes, transverse and longitudinal, were observed. Results are presented for the dependence of the phase velocities of these three modes on sample porosity and film thickness. The phonon velocities, especially those of the bulk modes, increase sharply with decreasing film thickness below ensuremath{sim}10 ensuremath{mu}m. This thickness dependence is attributed to the presence of a transition layer between the porous silicon film and crystalline Si substrate. Its influence on the film bulk modes increases with decreasing thickness. Elastic constants and Young's modulus of porous Si are estimated for different porosities from the phase velocities of the two bulk acoustic modes and are compared with the corresponding data obtained by other techniques." @default.
• W2022902566 created "2016-06-24" @default.
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• W2022902566 date "2002-04-10" @default.
• W2022902566 modified "2023-09-23" @default.
• W2022902566 title "Brillouin spectroscopy of acoustic modes in porous silicon films" @default.
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• W2022902566 doi "https://doi.org/10.1103/physrevb.65.165330" @default.
• W2022902566 hasPublicationYear "2002" @default.
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