Investigation of indium-defect pairs in CdTe by PAC spectroscopy

摘要

PAC spectroscopy is used to investigate indium-defect pairs in p-CdTe. It is shown that the frequently reported EFG_60 (v_Q = 60 MHz, #eta# = 0.15) is not the only signal which characterizes In-A centers. Depending on the annealing history of the sample, various EFGs with coupling constants between 49 and 60 MHz are observed at 300 K. At low temperatures, however, two well defined EFGs (EFG1:v_Q = 30 MHz #eta# = 0.43 and EFG2: v_Q = 62 MHz, #eta# = 0.19) are measured. After silver or copper doping, an EFG_57 with v_Q = 57 MHz and #eta# = 0.1 can be observed in some samples and a splitting into EFG1 and EFG2 at low temperatures is observable in some cases, too. We conclude that several different EFGs. meassured at 300 K represent the same probe-defect complex in different configurations. direct c 1999 Elsevier Science B.V. All rights reserved.