Abstract
Mossbauer emission spectroscopy at 73As(73Ge) is used to show that the charge state of the 73Ge antisite defect formed in the anion sublattice after the radioactive transformation of 73As is independent of the position of the Fermi level. In contrast, the 73Ge center in the cation sublattice of PbSe is an electrically active substitutional impurity. For the n-type samples, the spectrum corresponds to the neutral state of the donor center (73Ge2+), and for the p-type samples, the spectrum corresponds to the doubly ionized state (73Ge4+) of this center.
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