Positron annihilation lifetime spectroscopy of ZnO bulk samples

A. Zubiaga, F. Plazaola, J.A. Garcia, Filip Tuomisto, V. Munoz-San Jose, R. Tena-Zaera

Research output: Contribution to journalArticleScientificpeer-review

47 Citations (Scopus)
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Abstract

In order to gain a further insight into the knowledge of point defects of ZnO, positron annihilation lifetime spectroscopy was performed on bulk samples annealed under different atmospheres. The samples were characterized at temperatures ranging from 10to500K. Due to difficulties in the conventional fitting of the lifetime spectra caused by the low intensity of the defect signals, we have used an alternative method as a solution to overcome these difficulties and resolve all the lifetime components present in the spectra. Two different vacancy-type defects are identified in the samples: Zn vacancy complexes (VZn−X) and vacancy clusters consisting of up to five missing Zn-O pairs. In addition to the vacancies, we observe negative-ion-type defects, which are tentatively attributed to intrinsic defects in the Zn sublattice. The effect of the annealing on the observed defects is discussed. The concentrations of the VZn−X complexes and negative-ion-type defects are in the 0.2–2ppm range, while the cluster concentrations are 1–2 orders of magnitude lower.
Original languageEnglish
Article number085202
Pages (from-to)1-8
Number of pages8
JournalPhysical Review B
Volume76
Issue number8
DOIs
Publication statusPublished - Aug 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • bulk
  • positron annihilation
  • ZnO

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