Substrate Temperature Effect on Optical property of ZnO Thin Films
Keywords:ZnO, thin films, TCO, ultrasonic spray technique
The transparent conducting ZnO thin films were deposited on glass substrate by ultrasonic spray technique. The optical, electrical and structural properties of the ZnO thin films were studied as a function of the substrate temperatures in the range of 300 to 400°C. The as deposited film exhibit an hexagonal structure wurtzite and (101) oriented. The value of grain size = 28 nm is measured of ZnO film at 350°C. All the films having high transparency in the visible region, the band gap energy decreased from 3.44 to 3.29 eV with increasing in the substrate temperatures from 300 to 400°C. The the Urbach energy decreased reaching to minimum at 350°C; indicating to decrease of the defects. The electrical resistivity of the films for 350°C is 50 Ω.cm. A systematic study on the influence of the substrate temperatures on the properties of ZnO thin films deposited by ultrasonic spray has been reported.
Authors who publish with Engineering Journal agree to transfer all copyright rights in and to the above work to the Engineering Journal (EJ)'s Editorial Board so that EJ's Editorial Board shall have the right to publish the work for nonprofit use in any media or form. In return, authors retain: (1) all proprietary rights other than copyright; (2) re-use of all or part of the above paper in their other work; (3) right to reproduce or authorize others to reproduce the above paper for authors' personal use or for company use if the source and EJ's copyright notice is indicated, and if the reproduction is not made for the purpose of sale.