STRUCTURAL-PROPERTIES OF DEFECTS IN CD1-XZNXTE

Optically detected and conventional spin resonance investigations have been successful in determining the structure of cation vacancy-donor pairs (A-centers) and anion vacancies (V(Te)) in CdTe. Investigations in the ternary alloy system Cd1-xZnxTe for the complete range of x show that the A-center binding energy is almost independent of the composition. In CdTe the V(Te)+/0 level position is 0.2 eV above the valence band and correlation to a deep luminescence band at 1.15 eV can be drawn. In the alloys this photoluminescence band closely follows the conduction band from CdTe to ZnTe. Studies of the spectroscopic g-values of the shallow donors in Cd1-xZnxTe show that they shift linearly from -1.69 in CdTe to -0.4 in ZnTe.