Article ID Journal Published Year Pages File Type
1555192 Superlattices and Microstructures 2007 10 Pages PDF
Abstract
ZnO microcrystals and nanocrystals were grown on silicon substrates by condensation from vapour phase. Nanostructured ZnO films were deposited by plasma enhanced metal organic chemical vapour deposition (PEMOCVD). The parameters of field emission, namely form-factor β and work function ϕ, were calculated for ZnO structures by the help of the Fowler-Nordheim equation. The work functions from ZnO nanostructured films were evaluated by a comparison method. The density of emission current from ZnO nanostructures reaches 0.6 mA/cm2 at electric force F=2.1⋅105 V/cm. During repeatable measurements β changes from 5.8⋅104 to 2.3⋅106 cm−1, indicating improvement of field emission. Obtained values of work functions were 3.7±0.37 eV and 2.9-3.2 eV for ZnO nanostructures and ZnO films respectively.
Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
Authors
, , , , , , , , , ,