Direct observation of Li diffusion in Li-doped ZnO nanowires

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

来源：Materials Research Express, 2016, 3(5): 054001.

DOI：10.1088/2053-1591/3/5/054001

• scanning transmission electron microscopy
• in situ heating
• p-type ZnO
• lithium diffusion
• photoluminescence

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 singleNWwas observed between 200 degrees C and 600 degrees 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 (Li-i) to Zn-site substitutional Li (Li-Zn), 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.

• 出版日期2016-5
• 单位安徽大学