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Identification of Ag-acceptor related photoluminescence in Ag111 doped CdTe

1998; American Institute of Physics; Volume: 72; Issue: 23 Linguagem: Inglês

10.1063/1.121530

1520-8842

J. Hamann, Almut Burchard, M. Deicher, T. Filz, V. Ostheimer, C. Schmitz, H. Wolf, Th. Wichert,

Quantum Dots Synthesis And Properties

Bridgman-grown, nominally undoped CdTe crystals were doped with Ag by implanting radioactive Ag111. Photoluminescence spectra of the crystals show a donor-acceptor pair (DAP) line at 1.491 eV. The decrease of the intensity of this line with a half life of T1/2=(7.2±0.4) d is in good agreement with the half life of the β− decay of Ag111 to Cd111 of 7.45 d. This decrease is not caused by the aging behavior of Ag which was reported in the literature. The data show that the involved acceptor defect contains exactly one Ag atom and confirm the earlier assignment of the acceptor to the AgCd defect. Based on the DAP line at 1.491 eV, the spectra did not reveal a contamination of the CdTe crystals by stable Ag.