Parameterization of the optical functions of amorphous materials in the interband region
Abstract
A parameterization of the optical functions of amorphous semiconductors and insulators is presented in which the imaginary part of the dielectric function ɛ2 is determined by multiplying the Tauc joint density of states by the ɛ2 obtained from the Lorentz oscillator model. The real part of the dielectric function ɛ1 is calculated from ɛ2 using Kramers-Kronig integration. The parameters of this model are fit to n and k data for amorphous Si (2 data sets), SiO, As2S3, and Si3N4. Comparative fits are made with a similar parameterization presented earlier by Forouhi and Bloomer [Phys. Rev. B 34, 7018 (1986)]. In all cases, the new parameterization fits the data better.
- Publication:
-
Applied Physics Letters
- Pub Date:
- July 1996
- DOI:
- 10.1063/1.118064
- Bibcode:
- 1996ApPhL..69..371J