Porous GaP layers prepared by electrochemical dissolution of (100)-oriented bulk material have been studied by micro-Raman spectroscopy. The anodization causes a breakdown of the polarization selection rules, inherent to a (100) surface, accompanied by a downward shift of the LO-phonon frequency and by the appearance of a surface-related vibrational mode in the gap between the bulk optical phonons. The frequency of the surface-related mode was found to decrease from 398 to 394.3 cm^-1 with increasing anodization current. A Raman line-shape analysis based on the light scattering due to the electro-optic and deformation potential mechanisms is presented.
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Tiginyanu et al. (1997) studied this question.
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