Abstract
Spectroscopic-ellipsometry (SE) and thermoreflectance (TR) spectra of GaP and InP are presented. Both measurements are carried out on the same samples in the 1.4–5.6-eV photon-energy range at room temperature. The measured SE and TR spectra reveal distinct structures at energies of the E0, E0+Δ0, E1, E0', E2 and E2+δ critical points. The Γ8v→X6c indirect-gap peak at 2.25 eV can also be clearly seen in the TR spectrum of GaP. These spectra are analyzed based on a simplified model of the interband transitions. The results agree well with the experimental SE and TR data over the entire range of photon energies.
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