Direct observation of Li diffusion in Li-doped ZnO nanowires. (16th May 2016)

• Record Type: Journal Article
• Authors: Li, Guohua; Yu, Lei; Hudak, Bethany M; Chang, Yao-Jen; Baek, Hyeonjun; Sundararajan, Abhishek; Strachan, Douglas R; Yi, Gyu-Chul; Guiton, Beth S
• Is Part Of: Materials research express. Volume 3:Number 5(2016)
• Publication Date: 2016-05-16
• Subjects: scanning transmission electron microscopy -- in situ heating -- p-type ZnO -- lithium diffusion -- photoluminescence; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/3/5/054001
• Languages: English
• ISSNs: 2053-1591

Abstract

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.