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 language | English |
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Title of host publication | Proceedings of the Twelfth International Conference on Radiation Effects in Insulators (REI-12) |
Editors | L. Amaral , M. Behar , F. C. Zawislak |
Place of Publication | Amsterdam |
Publisher | ELSEVIER SCIENCE BV |
Pages | 164-169 |
DOIs | |
Publication status | Published - Jun 2004 |
Event | 12th International Conference on Radiation Effects in Insulators (REI-12) - Gramado, Brazil Duration: 31 Aug 2003 → 5 Sept 2003 Conference number: 12th |
Publication series
Name | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
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Publisher | Elsevier Science B.V. |
Number | 1-4 June |
Volume | 218 |
ISSN (Print) | 0168-583X |
Conference
Conference | 12th International Conference on Radiation Effects in Insulators (REI-12) |
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Country/Territory | Brazil |
City | Gramado |
Period | 31/08/03 → 5/09/03 |
Keywords
- Defects
- Electrical conductivity
- Ion implantation
- MgO