A-CENTERS MODIFYING IN CDTE-YB CRYSTALS

By means of electrical and magnetic investigation of Yb-doped CdTe cry stals, the following was established: (1) Additional shallow donors an d paramagnetic centers are not introduced into the doping process; the hole conductivity of doped crystals is controlled by A-centers; their ionization energy depends on Yb impurity concentration (C) according to the law E(A) = (0.15 + 2.4 x 10(-11)C(-1/2)) eV; (2) It is supposed that Yb impurity deforms the lattice so that the components of the co mplex A-center move away one from another when the concentration (C) i ncreases; and E(A) increases accordingly.