Abstract
Abstract The optical properties of ZnO nanowires, grown by the vapor-transport method using Au as catalyst over quartz, sapphire and SiO2/Si substrates, have been characterized as a function of the growth parameters such as temperature and time, and the thickness of the Au-catalyst film. The diameter and the length of the nanowires range from 40 to 200 nm and 0.2 to 2 µm, respectively. Room-temperature absorption and emission spectra show a well-defined exciton peak in the ultraviolet. Moreover, photoluminescence measurements show a very broad emission band in the visible range from 420 to 800 nm, which exhibits three distinct peak-like contributions in the Green, Yellow and Red at around 520, 590 and 720 nm (2.38, 2.10 and 1.72 eV), respectively. We observed that the intensity of the broad emission band in the visible increases relative to that of the exciton emission as the wire diameter decreases due to a surface effect. The origin of these visible contributions change as a function of the growth parameters and correspond to different defect-related recombination processes, which will be useful in the future applications of ZnO for optoelectronics.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
