Open AccessЭллипсометрические исследования монокристаллов Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=- и Bi-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-<Cu>
Author(s) -
Ш.К. Гудавасов,
Н. А. Абдуллаев,
Д.Н. Джалилли,
Z. I. Badalova,
И. А. Мамедова,
С. А. Немов
Publication year - 2021
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2021.08.51133.9654
Subject(s) - refractive index , photon energy , molar absorptivity , analytical chemistry (journal) , dielectric , materials science , dispersion (optics) , absorption (acoustics) , ellipsometry , atomic physics , photon , physics , chemistry , optics , thin film , optoelectronics , chromatography , composite material , nanotechnology
In this work, by spectroscopic ellipsometry the imaginary and real parts of the dielectric function of Bi2Se3 and Bi2Se3 single crystals were obtained in the photon energy range from 0.7 eV to 6.5 eV, and were determined the energies of allowed direct transitions responsible for some optical properties. By the help of Cody-Lorentz and Lorentz optical oscillators, the dispersion relation is adjusted in conformity with the experimental data. The values of the refractive index n and the extinction coefficient k of Bi2Se3 single crystals are calculated in the energy range from 0.7 eV to 6.5 eV. It was also determined that the maximum absorption corresponds to the transitions at 1.900 eV and 1.949 eV for Bi2Se3 and Bi2Se3 , respectively.