Abstract
Nanofilms of Zinc Oxide (ZnO) were fabricated from solutions of zinc tetraoxosulphate heptahydrate, citric acid, and sodium hydroxide onto a Fluorine Tin Oxide (FTO) conductive glass by elecrodeposition process. Time as bath parameter was varied. Three samples with time interval of 30 seconds, 60 seconds and 90 seconds were fabricated. Absorbance of the films was determined with the help of spectrophotometer. Other optical properties of the nanofilms were calculated using the appropriate equations from the literature. The deposited nanofilms have high absorbance in UV region and low absorbance in VIS – NIR region. Transmittance of the nanofilms is low in UV region and high in VIS – NIR region. Reflectance of the films is low throughout the UV – VIS – NIR regions. The optimal optical thickness of 270 nm was obtained at 90 seconds. The bandgap of the nanofilms obtained is between 3.30 to 3.60 eV. Average crystallite size of 43.04 nm was obtained for the deposited ZnO thin film.
Highlights
Zinc oxide is an inorganic compound with the formula Zinc Oxide (ZnO)
The films show high absorbance of about 0.47 abr. unit in UV region and high transmittance of 97.72 % in the NIR regions of electromagnetic spectrum shows that ZnO is a transparent semiconducting film
Optical is found to increase as time of deposition increases
Summary
Zinc oxide is an inorganic compound with the formula ZnO. ZnO is a wide-bandgap semiconductor of the II-VI semiconductor group. ZnO materials show an n-type electrical conductivity due to its native or intrinsic defects such as oxygen vacancies and interstitial zinc atoms [1]. Intrinsic zinc oxide thin films are highly resistive in nature, but when commonly doped with Group III elements such as Ga, in or Al, they become conducting [2]. ZnO is a cheap, abundant, chemically stable and nontoxic material that has been widely used in optoelectronic devices, photovoltaic devices and surface acoustic wave devices and sensors. Those properties are valuable in emerging applications for: transparent electrodes in liquid crystal displays, energysaving or heat-protecting windows, and electronics as thinfilm transistors and light-emitting diodes
Sign-in/Register to view highlights & summary 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
