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

Johansen, Klaus Magnus H; Zubiaga, Asier; Tuomisto, Filip; Monakhov, Edouard; Kuznetsov, Andrej; Svensson, Bengt Gunnar
Journal article; PublishedVersion; Peer reviewed
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PhysRevB.84.115203.pdf (291.5Kb)
Year
2011
Permanent link
http://urn.nb.no/URN:NBN:no-59832

CRIStin
850451

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  • Det matematisk-naturvitenskapelige fakultet [332]
  • CRIStin høstingsarkiv [16854]
Original version
Physical Review B. Condensed Matter and Materials Physics. 2011, 84 (11), DOI: http://dx.doi.org/10.1103/PhysRevB.84.115203
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.

© 2011 American Physical Society
 
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