Wüest M. 51 Wykes M. 82 Yamaguchi M. 17 Ybarra G. 129 Yubero F ...

JUNE 28 WEDNESDAY AFTERNOON
RIVA-TF-WeA-P.7 GROWTH OF CRYSTAL GERMANIUM-CARBIDE BY IMPLAN-
TATION . Genene Tessema 1,2 1 Faculty of Science, Department of Physics, Addis Ababa University,
P.O.BOX 1176, Addis Ababa, Ethiopia. 2 Helmholtz-Institut für Strahlen und Kernphysik, Nussalle
14-16, 53115 Bonn, Germany
The interactions of carbon with probe nucleus 111 In have been studied in germanium using the perturbed
angular correlation (PAC) method, which has the ability to detect the microscopic environments
of the probe atom by means of the interaction of the nuclear moments of the probe and the surrounding
electromagnetic fields 1,2 . At high dose carbon implantation in germanium two complexes
have been identified by their unique quadrupole interaction frequencies. An interaction frequency of
ν Q = 207(1) MHz (η = 0.16(3)) appeared at annealing temperatures below 650 ο C. Above 650 ο C, it
was replaced by a second interaction frequency of ν Q = 500(1) MHz ( η= 0). The frequencies are attributed
to two different carbon-indium pairs. The orientation of the corresponding electric field gradients
and thermal stability of the defect complexes are studied. The results are found to be in good
agreement with other methods 3 .
1. Th. Wichert, M. Deicher, G. Grübel, R. Keller, N. Schulz and H. Skudlik, Appl. Phys. A 48, 59
(1989)
2. G. Schatz and A. Weidinger, Nuclear Condensed Matter Physics, John Wiley and
Sons, New York (1992)
3. L. Hoffmann, J. C. Bach, and B. Bech Nielsen, Phys. Rev. B ; Vol. 55(17), 11 167 (1997)
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