Radiation damage in neutron transmutation doped-InP
Abstract
InP crystals irradiated at different thermal neutron fluences have been investigated by optical absorption and positron lifetime measurements. Irradiation produces a shift of the absorption edge towards long wavelengths and the appearance of an absorption band centered at 1.24 eV. The absorption edge is fully recovered after annealing but the absorption band remains. Positron lifetime spectra are analysed with two components. The longer lifetime, τ2 = 300 ps, has an intensity that increases with the fluence and falls down after annealing. This component has been associated to positrons trapped at In-monovacancy related defects. The absorption tail has been proposed to be due to optical transitions involving vacancies that act as acceptors while the 1.24 eV band has been tentatively ascribed to anion antisites.
- Publication:
-
Nuclear Instruments and Methods in Physics Research B
- Pub Date:
- December 1996
- DOI:
- 10.1016/S0168-583X(96)00517-4
- Bibcode:
- 1996NIMPB.120..240M