Estimation of optical parameters of silicon single crystals with different orientations

Abstract

Optical properties of Si single crystals with different orientations (1 0 0) and (1 1 1) were investigated using spectropho-tometric measurements in a spectral range of 200 nm to 2500 nm. The data of optical absorption revealed an indirect allowed transition with energy gap of 1.1 ± 0.025 eV. An anomalous dispersion in addition to a normal dispersion was observed in the spectra of refractive index. The normal dispersion of the refractive index was discussed according to Wemple-DiDomenico single oscillator model. The oscillator energy E , dispersion energy E , high frequency dielectric constant , lattice dielectric constant and electronic polarizability α were estimated. The real and imaginary parts of dielectric constant were also determined. o d ∞ L e 1 2