Premium
Investigation of n‐Pb 1− x Sn x Se absorption spectra
Author(s) -
Luchytskii B. M.,
Manzhara V. S.,
Staryk P. M.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220940207
Subject(s) - absorption edge , free carrier absorption , absorption (acoustics) , extended x ray absorption fine structure , photon energy , free electron model , absorption spectroscopy , attenuation coefficient , electron , spectral line , analytical chemistry (journal) , chemistry , scattering , atomic physics , materials science , wavelength , condensed matter physics , photon , band gap , optics , physics , optoelectronics , chromatography , quantum mechanics , astronomy , composite material
The long‐wavelength edge of fundamental absorption and absorption by free carriers of Pb 1− x Sn x Se ( x = 0.06) single crystals with free electron concentration 1.0 × 10 17 ≦ N ≦ 5.0 × 10 18 cm −3 is investigated. The absorption coefficient within 10 to 1500 cm −1 is shown to be exponentially dependent on photon energy. In samples with N > 5.0 × 10 17 cm −3 the absorption edge is described by the Urbach rule only at high temperatures. At T < T U the Burstein‐Moss effect dominates the shape of the absorption edge. A correlation between the calculated electron‐phonon coupling parameters γ and the experimental (2/3) σ 0 −1values is found. The temperature dependence of light absorption at λ = 14 μ by free carriers is investigated. Manifestation of the conduction band non‐parabolicity in the considered phenomena as well as the scattering mechanism of free electrons are discussed.