Optical properties of Si x Ge 1Àx single crystals grown by liquid phase diffusion

Abstract

a b s t r a c t In this article, we present measurements for the pseudo-optical functions of germanium-rich Si x Ge 1Àx (0.000rxr0.100) single-crystals (grown by Liquid Phase Diffusion; LPD) using spectroscopic ellipsometry and photoreflectance techniques in the energy range of 1.72-3.20 eV. The E 1 interband transition energies are obtained from numerically differentiated optical spectra for various crystal compositions. It was shown that the values of E 1 interband transition energy determined by both the ellipsometric and photoreflectance measurements for germanium-rich Si x Ge 1Àx single-crystals are in agreement with those of bulk SiGe crystals reported in the literatur