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• W2009396593 abstract "Dispersion relations for optical properties of solids, and a sum rule for the imaginary part of the dielectric constant, are reviewed and applications to semiconductors are described. Plasma frequencies, for which the real part of the dielectric constant vanishes, are associated with lattice vibrations, with free carriers, and with valance electrons. Gottlieb's infrared optical constants for LiF are in good agreement with the lattice vibration sum rule using unit effective charge. Dispersion relations for reflectivity have been used by Dixon to analyze optical constants of p-type PbTe in the infrared region where free-carrier effects dominate. He finds an effective mass at room temperature which rises from 0.1m to 0.3m as the carrier concentration is increased from 3×1018to 1020 cm−3. Morrison has measured the reflectivity of InAs, InSb, and GaAs and finds curves which agree well with those of Tauc and Abrahám. His analysis of these results using the dispersion relation predicts a plasma energy near 7 ev in these materials. Free carrier absorption in several III–V compounds and in PbS and PbTe is proportional to λp at long wavelengths, where p varies between 2, for InSb and AlSb, and 3, for InAs and GaAs. For n- and p-type PbS Riedl finds p=2.4. He observes additional structure near the intrinsic absorption edge of p-type PbTe, resembling that observed in n-type GaAs and GaP, which may be associated with a valence band about 0.1 ev below the band edge. The absorption coefficient near the absorption edge of all the lead compounds and of InAs is proportional to eℏω/kTeff, with 80°K&lt;Teff &lt;120°K for measurements taken at room temperature. Impurity effects on the energy gap are discussed in terms of a simple model." @default.
• W2009396593 created "2016-06-24" @default.
• W2009396593 creator A5062547546 @default.
• W2009396593 date "1961-10-01" @default.
• W2009396593 modified "2023-10-18" @default.
• W2009396593 title "Optical Properties of Lead-Salt and III–V Semiconductors" @default.
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• W2009396593 doi "https://doi.org/10.1063/1.1777036" @default.
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