Abstract
High-quality tetrapod-shaped Al-doped ZnO( T-AZO) nanostructures were synthesized via thermal evaporation of mixed Zn and Al powders. The effects of Al dopant concentration on the morphology,microstructure,optical and field emission( FE) properties of T-AZO were investigated using scanning electronic microscopy( SEM),X-ray diffraction( XRD),photoluminescence( PL)spectra and FE measurement. It is found that the incorporation of Al increases the aspect ratio of the tetrapods,leads to blue-shift in the UV region,and significantly improves the FE performances. The results also show that tetrapod cathodes with 3% Al mole fraction have the best FE properties,with a turn-on field of 1. 33 V / μm,and a field enhancement factor as high as 8 420. The superior FE properties are mainly attributed to the high aspect ratio of the legs in the unique tetrapod-liked structures,and more electrons being induced in the conduction band by Al dopand.
Sign-in/Register to access full text options 
Free) 
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 call
