Low Temperature Physics: 35, 83 (2009); https://doi.org/10.1063/1.3064915 (6 pages)
Donor exciton of cobalt and its interaction with lattice vibrations in ZnO:Co semiconductor crystals
N.B. Gruzdev, V.I. Sokolov
Institute of Metal Physics RAS, Ekaterinburg 620041, Russia
Institute of Solid State Physics RAS, Chernogolovka, Moscow region, 142432, Russia
Received Jule 24, 2008
The vibrational states of the ZnO:Co compound interacting with the donor exciton were revealed by the sensitive method of field exciton-vibrational spectroscopy. Using the available data on symmetrized local density of the ZnO and ZnO:Ni3+ states, the vibrational modes of the electron absorption spectrum of ZnO:Co in the field of donor exciton were interpreted. The results were compared with those obtained earlier for II–VI:Ni compounds in the case of acceptor exciton. The position of the Co2+ donor level was determined with respect to the conduction band bottom. This position is in good agreement with the universal trend of changing the 3d-ions donor levels in II–VI-compounds.
PACS: 71.20.Be Transition metals and alloys;
Key words: electroabsorption, donor level, lattice vibrations, excitons.