Open AccessОптические переходы в кристаллах ZnSe и CdTe с участием d-зон катионов
Author(s) -
В. В. Соболев,
D. A. Perevoshchikov
Publication year - 2018
Publication title -
fizika i tehnika poluprovodnikov
Language(s) - English
Resource type - Journals
eISSN - 1726-7315
pISSN - 0015-3222
DOI - 10.21883/ftp.2018.03.45613.8629
Subject(s) - cadmium telluride photovoltaics , spectral line , exciton , reflectivity , oscillator strength , permittivity , diagram , materials science , chemistry , physics , atomic physics , molecular physics , condensed matter physics , optics , optoelectronics , dielectric , quantum mechanics , mathematics , statistics
The permittivity spectra ε_1( E ) and ε_2( E ) of ZnSe and CdTe crystals are calculated in the range of 10–25 eV using their experimental reflectance spectra and Kramers–Kronig integral relations. The spectra are decomposed into thirteen and twelve separate transition bands for ZnSe and CdTe, respectively, using the improved nonparametric combined Argand diagram technique. The main spectral parameters, including the maximum energies and halfwidths and oscillator strengths, are determined. The oscillator strengths are found to be within 0.1–1.4 for ZnSe and 0.2–0.7 for CdTe. The obtained ε_2( E ) bands are due to interband and exciton transitions with the involvement of cation core d bands of both crystals under consideration.