Three models for the dielectric function εx(hν) of AlxGa1-xAs are reviewed. All are based on measured optical constants at discrete compositions. The validity of each model near critical point energies, and otherwise, is evaluated. Only the energy-shift model is appropriate over the entire available spectrum (1.5-6.0 eV), including the band-gap (E0) region.
ASJC Scopus subject areas
- General Physics and Astronomy