Premium
Thermoreflectance spectra and energy band structure of ZnGeP 2 crystals
Author(s) -
Raudonis A.,
Grigoreva V. S.,
Prochukhan V. D.,
Šileika A.
Publication year - 1973
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.2220570141
Subject(s) - sphalerite , materials science , absorption edge , spectral line , chalcopyrite , valence band , band gap , absorption spectroscopy , molecular physics , crystallography , optics , chemistry , optoelectronics , physics , pyrite , astronomy , copper , metallurgy
The thermoreflectance spectra of ZnGeP 2 chalcopyrite crystals have been investigated with polarized light in the spectral region 2.0 to 5.0 eV at 120 and 320 ° K. Three structures (2.46, 2.53, and 2.59 eV at 120 ° K) due to the optical transitions derived from T 15 — T 1 transitions in sphalerite have been observed by 0.4 eV above the fundamental absorption edge. Crystal‐field and spin‐orbit splittings of the valence band were found to be 0.084 and 0.075 eV, respectively. At higher energies eight thermoreflectance peaks strongly dependent on polarization of light were observed. They were attributed to optical transitions derived mainly from transitions responsible for E 1 E 1 + Δ 1 , E 0 and E 2 structures in the optical spectrum of GaP, the closest binary analogue of ZnGeP 2 .