ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Single crystals of CdGa2 Se4 :Co2+ were grown by the chemical transport reaction method. We observed the photoconductivity peaks at 2.13, 1.96, and 1.86 eV due to the cobalt impurity. The photoconductivity impurity peaks correspond to electronic transitions of Co2+ ion with S4 symmetry between the valence subband, the lower conduction band, and the split energy levels of Co2+ in the forbidden band gap of the CdGa2 Se4 :Co2+ single crystals. We also observed photoconductivity peaks at 3.09, 3.20, and 3.32 eV due to the optical transitions from the subbands Γ5 +Γ8, Γ6 +Γ7, and Γ6 +Γ7 located below the valence band to the lower conduction band Γ5 +Γ8. The temperature dependence of the energy of the principal photoconductivity peaks P11 and P21 for the undoped CdGa2 Se4 and the CdGa2 Se4 :Co2+ single crystals can be well modeled by the Varshni equation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340370
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