Direct observation of Li diffusion in Li-doped ZnO nanowires

Guohua Li, Lei Yu, Bethany M. Hudak, Yao Jen Chang, Hyeonjun Baek, Abhishek Sundararajan, Douglas R. Strachan, Gyu Chul Yi, Beth S. Guiton

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The direct observation of Li diffusion in Li-doped zinc oxide nanowires (NWs) was realized by using in situ heating in the scanning transmission electron microscope (STEM). A continuous increase of low atomic mass regions within a single NW was observed between 200 ° C and 600 ° C when heated in vacuum, which was explained by the conversion of interstitial to substitutional Li in the ZnO NW host lattice. A kick-out mechanism is introduced to explain the migration and conversion of the interstitial Li (Lii) to Zn-site substitutional Li (LiZn), and this mechanism is verified with low-temperature (11 K) photoluminescence measurements on as-grown and annealed Li-doped zinc oxide NWs, as well as the observation of an increase of NW surface roughing with applied bias.

Original languageEnglish
Article number054001
JournalMaterials Research Express
Volume3
Issue number5
DOIs
StatePublished - May 2016

Bibliographical note

Publisher Copyright:
© 2016 IOP Publishing Ltd.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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