Electrical conductivity of as-grown and oxidized MgO: Li crystals implanted with Li ions

M. M. Tardío, Rafael Ramı́rez, Roberto Gonzalez González, Joana Vaz Pinto, Rui C. da Silva

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Alternating and direct current electrical measurements between 293 and 450 K were used to characterize the electrical conductivity of the implanted region in as-grown and oxidized MgO:Li single crystals. Both types of crystals were implanted with Li(+) ions with art energy of 175 keV and a fluence of 1 x 10(17) ions/cm(2). The electrical conductivity of the implanted regions was approximate to14 and 7 orders of magnitude higher than that of the unimplanted areas, respectively. Electrical measurements at different temperatures of the implanted regions suggest thermally activated processes with activation energies of about 0.14 and 0.06 eV in as-grown and oxidized samples, respectively. In both type of crystals, the I-V characteristics reveal that the contacts are ohmic, in contrast to blocking contacts in unimplanted crystals. The enhancement in conductivity observed in the implanted region is associated with the intrinsic defects created by the implantation, rather than with the implanted Li ions. The differences in both conductivity and activation energy relative to undoped crystals are likely due to free carriers already present in different concentrations in as-grown and oxidized MgO:Li crystals before implantation.
Original languageEnglish
Title of host publicationProceedings of the Twelfth International Conference on Radiation Effects in Insulators (REI-12)
EditorsL. Amaral , M. Behar , F. C. Zawislak
Place of PublicationAmsterdam
PublisherELSEVIER SCIENCE BV
Pages164-169
DOIs
Publication statusPublished - Jun 2004
Event12th International Conference on Radiation Effects in Insulators (REI-12) - Gramado, Brazil
Duration: 31 Aug 20035 Sep 2003
Conference number: 12th

Publication series

NameNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
PublisherElsevier Science B.V.
Number1-4 June
Volume218
ISSN (Print)0168-583X

Conference

Conference12th International Conference on Radiation Effects in Insulators (REI-12)
CountryBrazil
CityGramado
Period31/08/035/09/03

Keywords

  • Defects
  • Electrical conductivity
  • Ion implantation
  • MgO

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