Estimation of optical parameters of silicon single crystals with different orientations

• Main Authors: El-Nahass M.M., Ali H.A.M.
• Format: Article
• Language: English
• Published: Sciendo 2019-03-01
• Series: Materials Science-Poland
• Subjects: single crystals; different orientations; optical parameters
• Online Access: http://www.degruyter.com/view/j/msp.2019.37.issue-1/msp-2019-0003/msp-2019-0003.xml?format=INT

Optical properties of Si single crystals with different orientations (1 0 0) and (1 1 1) were investigated using spectrophotometric 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 refractive index. The normal dispersion of the refractive index was discussed according to Wemple-DiDomenico single oscillator model. The oscillator energy Eo, dispersion energy Ed, high frequency dielectric constant ∈∞, lattice dielectric constant ∈L and electronic polarizability αe were estimated. The real ∈1 and imaginary ∈2 parts of dielectric constant were also determined.