Frenkel pairs, vacancies, and self-interstitials in Ge: identification andproperties from PAC- and Moessbauer spectroscopy

Perturbed angular correlation spectroscopy (PAC) and the Moessbauer effect were utilized to study intrinsic point defects in Ge. In continuation of ea rlier work the production of Frenkel pairs in p-type Ge is studied microsco pically by PAC utilizing the PAC probe as the primary knock-on atom receivi ng 29 eV recoil energy (Neutrino-recoil technique). Correlated recombinatio n of the produced Frenkel pairs is observed between 205 and 238 K. This tem perature agrees with the formerly determined migration temperature for long -range interstitial migration (220(5)K) and strongly corroborates the ident ification of the vacancy and self-interstitial in that former work. In a se cond type of experiment the Moessbauer probe Sb-119, being a donor in Ge, i s utilized to study the trapping of negative vacancies in n-type material i nduced by electron irradiation. The result is compared to the previously ob served trapping of neutral vacancies in p-Ge at In-111 PAC probes. (C) 1999 Elsevier Science B.V. All rights reserved.