Rf Magnetron Kopartma Tekniği ile Büyütülen Licoo2 İnce Filmlerin Optik, Elektrokromik ve Yapısal Özelliklerinin İncelenmesi

Abstract

The rapid population growth on Earth has caused the need for fossil energy sources to increase worldwide. As a consequence of the use of fossil-based fuels, the earth is facing problems such as global warming, greenhouse effect and ozone layer depletion. With advances in technology, the tendency to use alternative and renewable energy sources have risen. Electrochromic materials are sources that can change optical properties under electrical voltage reversibly. This reversible mechanism that can be observed in electrochromic materials is called electrochromism. LiCoO2 is a material that is being used in rechargeable batteries. It is necessary to investigate the areas of use of the thin film form of the LiCoO2 which has a large capacitor feature. How the deposition parameters affect the coloration mechanisms and the electrochromic features needs to be understood in order for LiCoO2 thin films to be used in solid state electrochromic devices. In this study, LiCoO2 thin films have been deposited on glass substrates using RF magnetron sputtering technique. The effects of the heat of the substrates, the plasma power, partial oxygen pressure and film thickness on the electrochromic and optical properties of the deposited LiCoO2 thin films have been investigated. In this thesis, the efficiencies of optical modulation and coloration of the samples that show optical coloration have been calculated. The structural properties have been determined by X-ray diffraction and atomic force surface images have been taken by scanning electron microscope. While the electrochromic analysis of the samples were being performed, voltage and time dependent current cyclic voltammetry and cronoamperometry measurements have been performed. By calculating and taking into account the areas below the cronoamperometry curves, the amount of the ions that intercalated and deintercalted have been microscopy. The calculated. While the LiCoO2 thin films that have been deposited for this have shown weak electrochromical coloration, due to the ion intercalation and deintercalation capacities observed during electrochemical processes, it has been forseen that they can be used as an ion conducting layer.