H passivation of Li on Zn-site in ZnO: Positron annihilation spectroscopy and secondary ion mass spectrometry

K.M. Johansen, A. Zubiaga, F. Tuomisto, E.V. Monakhov, A.Yu. Kuznetsov, B.G. Svensson

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Abstract

The interaction of hydrogen (H) with lithium (Li) and zinc vacancies (VZn) in hydrothermally grown n-type zinc oxide (ZnO) has been investigated by positron annihilation spectroscopy (PAS) and secondary ion mass spectrometry. Li on Zn-site (LiZn) is found to be the dominant trap for migrating H atoms, while the trapping efficiency of VZn is considerably smaller. After hydrogenation, where the LiZn acceptor is passivated via formation of neutral LiZn-H pairs, VZn occurs as the prime PAS signature and with a concentration similar to that observed in nonhydrogenated Li-poor samples. Despite a low efficiency as an H trap, the apparent concentration of VZn in Li-poor samples decreases after hydrogenation, as detected by PAS, and evidence for formation of the neutral VZnH2 complex is presented.
Original languageEnglish
Article number115203
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Volume84
Issue number11
DOIs
Publication statusPublished - Sep 2011
MoE publication typeA1 Journal article-refereed

Keywords

  • H
  • Li
  • positron
  • SIMS
  • ZnO

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