Wednesday 20 Sep 2017: NEST Seminar: Growth and nanocharacterisation of oxide nanowires
Prof Cuong Ton-That - School of Mathematical and Physical Sciences, University of Technology Sydney, Australia
The investigation of the structural, electronic and optical properties of semiconductor nanostructures has been an active field of research for the past decade. In particular, nanowires made of the large bandgap zinc oxide (ZnO) and its alloys have been extensively investigated because this material system is a promising candidate for short-wavelength optoelectronics, photonics, solar cells and sensors. Although the properties of these grown nanowires are mainly governed by the well-known bulk properties, the influence of the surface increases with decreasing their size. We performed surface, optical and electronic characterisation of oxide nanowires and the results were correlated to their growth and doping conditions. Of particular interest is the use of cathodoluminescence hyperspectral imaging technique, which is capable of providing nanoscale-resolution maps of the distributions of impurities, point defects and strain in nanowires. The work will be explained in the broader context of theoretical perspectives and emerging applications.