Substrate Temperature Effect on Optical property of ZnO Thin Films
Author(s) -
Achour Rahal,
Said Benramache,
Boubaker Benhaoua
Publication year - 2014
Publication title -
engineering journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.246
H-Index - 20
ISSN - 0125-8281
DOI - 10.4186/ej.2014.18.2.81
Subject(s) - wurtzite crystal structure , materials science , thin film , substrate (aquarium) , band gap , electrical resistivity and conductivity , optoelectronics , grain size , composite material , nanotechnology , metallurgy , zinc , electrical engineering , oceanography , geology , engineering
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.
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