Elastic Properties Of Crystalline-amorphous Core-shell Silicon Nanowires

Amer Chemical Soc
Publication Type:
Journal Article
Journal of Physical Chemistry C, 2013, 117 (8), pp. 4219 - 4226
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The pressure behavior of Raman frequencies and line widths of crystalline core-amorphous shell silicon nanowires (SiNWs) with two different core-to-shell ratio thicknesses was studied at pressures up to 8 GPa. The obtained isothermal compressibility (bulk modulus) of SiNWs with a core-to-shell ratio of about 1.8 is 20% higher (lower) than reported values for bulk Si. For SiNWs with smaller core-to-shell ratios, a plastic deformation of the shell was observed together with a strain relaxation. A significant increase in the full width at half-maximum of the Raman LTO-peak due to phonon decay was used to determine the critical pressure at which LTO-phonons decay into LO + TA phonons. Our results reveal that this critical pressure in strained coreshell SiNWs (4 GPa) is different from the reported value for bulk Si (7 GPa), whereas no change is observed for relaxed coreshell SiNWs
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