Abstract
The reflection spectra of single crystals of ZnO were studied between 1 and 45 μ. In samples with free-carrier concentration below 10 16 cm −3, the usual reflection spectrum of an ionic crystal was observed. An excellent fit to the data is achieved by using a value of the high frequency dielectric constant ϵ o = 2.0, a static dielectric constant ϵ, = 8.15, and a transverse optical mode frequency ν t = 414 cm −1. The contribution to the optical constants by the free carriers becomes significant in the reflection spectra for carrier concentrations larger than ∼ 1× 10 17 cm −3. Using a method similar to that of Spitzer and Fan an effective mass of m ∗ = 0.06 has been measured. The reflection of ZnO containing carriers can be fitted remarkably well over the range 1–45μ by the classical theory for free carriers and a lattice oscillator. The effective charge per ion site, as defined by szegetti, is found to be q ∗ = l.06e .
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