Abstract
Fe 3+, Fe 2+, Fe 1+, and very probably also Fe 0 centers have been observed by Mössbauer absorption or emission spectroscopy in 57Fe- (or 57Co) doped ZnTe, depending on the experimental conditions. Isomer shift measurements show that the iron bondings are more covalent than in ZnS. Low-temperature Raman relaxation rates within the Fe 2+ spin-orbit levels are found to be at least 100 times larger in ZnTe than in ZnS. A transient one-electron trap Fe 1+ state was observed after electron capture decay of 57Co below 130 K in stoichiometric ZnTe. The Fe 1+−Fe 2+ transition was shown to obey an activation process with an energy of 0.09 ± 0.02 eV. A transient two-electron trap Fe 0 state seems to have also been detected as a percursor of the Fe 1+ state in low-temperature emission spectra. In a ZnTe semiconductor with enhanced p character, the acceptor states Fe 1+ and Fe 0 are no longer observed after the 57Co decay, whereas a donor state Fe 3+ appears.
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