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Diffusion and configuration of Li in ZnO

Knutsen, Knut Erik; Johansen, Klaus Magnus H; Neuvonen, Pekka Tapio; Svensson, Bengt Gunnar; Kuznetsov, Andrej
Journal article; PublishedVersion; Peer reviewed
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1%252E4773829.pdf (847.8Kb)
Year
2013
Permanent link
http://urn.nb.no/URN:NBN:no-59869

CRIStin
998976

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  • Det matematisk-naturvitenskapelige fakultet [335]
  • CRIStin høstingsarkiv [16955]
Original version
Journal of Applied Physics. 2013, 113 (2), DOI: http://dx.doi.org/10.1063/1.4773829
Abstract
Diffusion of Li into ZnO from an “infinite” surface source under oxygen-rich conditions is studied using secondary ion mass spectrometry. The Li concentration-versus-depth profiles exhibit a distinct and sharp drop, which evolves in position with temperature and time. The sharp drop is associated with an efficient conversion from highly mobile Li-interstitials (Lii) to practically immobile Li-substitutionals (LiZn) via a kick-out mechanism. The characteristic concentration level at which Li drops provides a measure of the active donor concentration in the samples at the processing temperature, and gives evidence of residual impurities being responsible for the commonly observed “native” n-type conductivity. These donors are suggested to arise from different impurities, with Al and Si as the prevailing ones in hydrothermal and melt grown material. Further, evidence of electric field effects on Li diffusion profiles is obtained, and they are considered as a main reason for the slow diffusivity obtained in this work (using O-rich conditions) relative to those previously reported in the literature (obtained under Zn-rich conditions).

This research was originally published in the Journal of Applied Physics. © AIP Publishing
 
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