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Optical properties of transition metal impurities in CdSe II. Photoionization spectra
Author(s) -
Raranowski J. M.,
Langer J. M.
Publication year - 1971
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.2220480246
Subject(s) - photoionization , impurity , ionization , spectral line , transition metal , atomic physics , absorption spectroscopy , valence (chemistry) , chemistry , ionization energy , electron paramagnetic resonance , materials science , ion , nuclear magnetic resonance , physics , optics , biochemistry , organic chemistry , astronomy , catalysis
The photoionization absorption spectra of Cr and Fe impurities in CdSe are presented. They are very well described in terms of photo‐transitions from the localized 3d shell to the conduction band. The ionization energies and the matrix elements of electric dipole transitions are determined. It is found that deep donor levels of Cr 2+ and Fe 2+ arc 0.62 and 0.63 eV above the top of the valence band, respectively and are temperature‐indepenent. Observed spectra of CdSe:Fe 2+ are succesfully correlated with previously published results of photosensitive EPR of CdSe:Fe 3+ . The photoionization processes for other transition metal impurities are discussed. The ionization energies for some of them are estimated.