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Optical Properties and Energy Band Structure of Zn 3 P 2 and Cd 3 P 2 Crystals
Author(s) -
Sobolev V. V.,
Syrbu N. N.
Publication year - 1974
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.2220640202
Subject(s) - photoconductivity , exciton , spectral line , reflectivity , crystal (programming language) , absorption spectroscopy , absorption edge , band gap , analytical chemistry (journal) , absorption (acoustics) , lattice (music) , materials science , chemistry , crystallography , condensed matter physics , optics , physics , optoelectronics , chromatography , astronomy , computer science , acoustics , composite material , programming language
Edge absorption, photoconductivity, and reflectivity spectra are investigated of Zn 3 P 2 crystals in the range from 1 to 12.5 eV and reflectivity spectra of Cd 3 P 2 crystals in the range from 1 to 12.5 eV. The Eg value of Zn 3 P 2 has been experimentally determined at 293 and 77 OK. Its nature has been found to be due to direct transitions. Three peaks of exciton and interband character have been observed in the photoconductivity spectrum of Zn 3 P 2 single crystals. Complex structures (about 12 peaks) have been observed in the reflectivity spectra of both compounds. Most of these structures may be accounted for in terms of the well‐known theoretical calculations of their bands. Several peaks have been observed in the most thoroughly studied spectrum of Zn 3 P 2 . These peaks cannot be explained by the theoretical band scheme and are probably caused by the peculiarities of the bands of real crystals of the Zn 3 P 2 type, which have been lost in the well‐known theoretical model because of the accepted simplifications of the crystal lattice.