Abstract

Vanadium doped CdTe is studied by electron paramagnetic resonance (EPR), photo-EPR, and optical absorption. The EPR measurements identify vanadium substitutional for Cd in the oxidation states V 2+ and V 3+. Whereas V 3+ shows the well-known isotropic EPR spectrum, the V 2+ spectrum features triclinic symmetry due to a strong Jahn-Teller coupling. By photo-EPR, the V 2+ V 3+- donor level was determined at 0.67 eV below the conduction band. In absorption, additionally to internal crystal field transitions of vanadium, we also observe the recharging process V 3+ to V 2+.

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