Positron annihilation lifetime spectroscopy of ZnO bulk samples

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Journal Title

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Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2007-08

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Mcode

Degree programme

Language

en

Pages

8
1-8

Series

PHYSICAL REVIEW B, Volume 76, issue 8

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.

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Keywords

bulk, positron annihilation, ZnO

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Citation

Zubiaga , A , Plazaola , F , Garcia , J A , Tuomisto , F , Munoz-San Jose , V & Tena-Zaera , R 2007 , ' Positron annihilation lifetime spectroscopy of ZnO bulk samples ' , Physical Review B , vol. 76 , no. 8 , 085202 , pp. 1-8 . https://doi.org/10.1103/PhysRevB.76.085202