Preparation, Optical Absorption, Photoconductivity, and Thermally Stimulated Conductivity of ZnGa2Se4

Author： Kerimova T.G.   Sultanova A.G.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 0020-1685

Source： Inorganic Materials, Vol.38, Iss.10, 2002-10, pp. : 992-994

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Abstract

The optical absorption, photoconductivity, and thermally stimulated current (TSC) spectra of ZnGa2Se4 were measured. The results demonstrate that the optical transitions at point Γ (000) for the E ⊥ c polarization have the lowest energy. TSC data point to a trap depth of 0.24 eV and a quasi-continuous trap distribution centered at 0.49 eV. The 2.23- and 2.10-eV peaks in the spectral dependence of the photocurrent are attributed to electron transitions from the valence band to the trap level located 0.24 eV below the conduction-band minimum and to the quasi-continuously distributed trap levels around 0.49 eV.

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