Numerical Derivative Analysis of the Pseudodielectric Function of CdTe

概要

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The real (ε_1) and imaginary (ε_2 ) parts of the dielectric function for CdTe have been measured by spectroscopic ellipsometry in the 1.1-5.6-eV photon-energy range at room temperature. The measured spectra reveal distinct structures at energies of the E_0,E_0+Δ_0, E_1,E_1+Δ_1, and E_2 oritical points (CPs). These data are analyzed by fitting the first-(dε/dE) or second-derivative spectra (d^2ε/dE^2) with model dielectric functions (MDF) or standard criticat-point (SCP) line shapes. It is found that both the MDF and SCP models successfully explain the measured derivative spectra. The MDF also shows excellent agreement with the experimental ε(ω) spectra, but the SCP does not. The CP energies determined here are: E_0=1.58 eV;E_0,+Δ_0=2.55 eV;E_1=3.55 eV;E_1+Δ_1=4.l3 eV; and E_2=5.13 eV.
社団法人応用物理学会の論文
1993-06-15