Thermoreflectance spectroscopy of Te-based II–VI compounds ZnTe and CdTe

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Abstract
Thermoreflectance (TR) spectra of Te-based II–VI compounds ZnTe and CdTe are presented. Measurements are carried out on the bulk single crystals in the 2.0–5.6 eV photon-energy range at room temperature. The TR spectra obtained reveal distinct structures at energies of the E0, E0+Δ0, E1, E1+Δ1, E0′, and E2 critical points (CPs). Detailed analyses are made using a simplified model of the interband transitions. Results suggest that the E0 and E0+Δ0 structures can be characterized by a three-dimensional M0 CP, the E1 and E1+Δ1 structures by a two-dimensional (2D) M0 CP, and the E0′ and E2 structures by a damped harmonic oscillator (a broadened 2D M1 CP). It is also concluded that the broadening terms cannot be neglected in the analysis of TR spectra.