Abstract
Spectroscopic ellipsometry has been used to measure the complex dielectric function ε(E)=ε1(E)+iε2(E) of PbS single crystals. The measurements are made on cleaved PbS surfaces in the 1.5–5.3 eV photon-energy range at room temperature. It is found that the optical properties of PbS are very sensitive to air exposure. The observed ε(E) spectra reveal distinct structures at energies of the E1, E2, and E3 critical points (CPs). These data and the literature values are used for the modeling of the optical constants of PbS over the 0.3–5.3 eV photon-energy range, including the band-gap (E0∼0.4 eV) region. It is shown that the three-dimensional M0 CP (E0) and damped harmonic-oscillator model (E1, E2, and E3) provide satisfactory fits to the experimental optical-constant data.
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