Thin Films Advantages And Disadvantages
Abstract Nano thin films have found a vast application in today’s world. Thin film studies have directly or indirectly advanced many new areas. Thin films due to its different properties in nano range provide a large scope to be used in miniature size devices. In comparison to monolayer thin films, multilayer thin films are supposed to exhibit far more enhanced properties. The purpose of this paper is to review the fabrication techniques, advantages and applications of multilayer thin film. In addition to this the paper also emphasis on the properties of cadmium sulphide and cadmium zinc sulphide. Multilayer thin film of cadmium sulphide and cadmium zinc sulphide can be used for the better performance of the solar cells and other photoconductive …show more content…
Day by day the demand of energy is increasing and the resources are going down. An evergreen and long lasting source of energy i.e. solar energy can be adopted as the easily available productive means to fulfil the requirements. Thin films here play a significant role for capturing the solar energy and converting it into electrical energy. The absorption property, anti-reflective properties, less light absorption losses, better conductivity, cost efficient are the various criteria which needs to be satisfied for a thin …show more content…
The thickness of the film increases with the deposition of different layers. The thickness of monolayer is less as compared with the double layer and multilayer. It also depends on the deposition technique and the time of deposition [15]. 6.2 Optical Properties The optical transmittance of CdS thin film is found to be in the range of 40% to 50% for more than 500nm wavelength. The band gap decrease is observed due to the annealing effect. Broad emission bands are achieved and due to annealing the green emission are doubled and the red emission is slightly increased [16]. The optical transmittance characteristics of Zn-CdS thin film was observed to be in the wavelength range of 300 to 900 nm at room temperature. The observed optical transmittance is around 85 % for Zn-CdS thin film. It was also found that the optical band edge was blue shifted from the reported bulk band gap value. This suggests the captivity of particle size in the deposited Zn-CdS thin film
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