skip to main content

SciTech ConnectSciTech Connect

Title: Localised vibrational mode spectroscopy studies of self-interstitial clusters in neutron irradiated silicon

The evolution of self-interstitial clusters in silicon (Si), produced by fast neutron irradiation of silicon crystals followed by anneals up to 750 °C, is investigated using localised vibrational mode spectroscopy. A band at 582 cm{sup −1} appears after irradiation and is stable up to 550 °C was attributed to small self-interstitial clusters (I{sub n}, n ≤ 4), with the most probable candidate the I{sub 4} structure. Two bands at 713 and 758 cm{sup −1} arising in the spectra upon annealing of the 582 cm{sup −1} band and surviving up to ∼750 °C were correlated with larger interstitial clusters (I{sub n}, 5 ≤ n ≤ 8), with the most probable candidate the I{sub 8} structure or/and with chainlike defects which are precursors of the (311) extended defects. The results illustrate the presence of different interstitial clusters I{sub n}, at the various temperature intervals of the material, in the course of an isochronal anneal sequence. As the annealing temperature increases, they evolve from first-order structures with a small number of self-interstitials (I{sub n}, n ≤ 4) for the temperatures 50 < T < 550 °C, to second order structures (I{sub n}, 5 ≤ n ≤ 8) with a larger number of interstitials,more » for the temperatures 550 < T < 750 °C.« less
Authors:
;  [1] ;  [2] ;  [3]
  1. University of Athens, Solid State Physics Section, Panepistimiopolis Zografos, Athens 157 84 (Greece)
  2. Materials Engineering, The Open University, Milton Keynes MK7 6AA (United Kingdom)
  3. (United Kingdom)
Publication Date:
OSTI Identifier:
22218256
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 4; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CRYSTALS; FAST NEUTRONS; INFRARED SPECTRA; INTERSTITIALS; IRRADIATION; PRECURSOR; SEMICONDUCTOR MATERIALS; SILICON; SPECTROSCOPY