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Uyarlanmış sol-jel üretim süreçleriyle indiyum kalay oksit (ITO) kaplamaların geliştirilmesi

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2012
Transparent conducting oxide (TCO) coatings have been widely used in many optoelectronic applications. These coatings can be applied as an electrode material on different substrates including glass, silicon and polymeric materials for designing a variety of functional devices and systems. Flat panel displays (FPDs), solar cells, light emitting diodes, and electrochromic glasses are among the main applications implementing TCOs. Most research on the development of TCO materials has been on n-type semiconductors including tin oxide (SnO2), indium oxide (In2O3), zinc oxide (ZnO), cadmium oxide (CdO) and impurity-doped forms of these oxides allowing appropriate defect chemistry required for conductivity. Since the first observations in CdO in early 50’s, concentrated and dynamic research effort in the TCO area has focused on tin-doped indium oxide (In2O3:Sn) known as indium tin oxide (ITO), as it offers excellent electrical and optical properties combined with reproducible processing ability. Despite the active research in this area, ITO today still remains as the material of choice for its unique properties and technological significance. The manufacturing of commercial ITO coatings is currently achieved by vacuum deposition techniques and most extensively by sputtering. The proposed work aims establishment of sol-gel processing routes as an alternative method for ITO coating production, which offer a simple and an advantageous way of thin film preparation without any need for sophisticated equipment. The ongoing research and related literature on preparation of ITO films by sol-gel method is vast, yet a number of problems and challenges remain unresolved in obtaining technologically relevant sol-gel ITO coating products. The electrical/ optical properties for sol-gel coatings are typically poor compared with the high quality ITO coatings produced by sputtering. In this regard, some novel processing modifications for conventional sol-gel approaches have be introduced in this current accomplished work in an attempt to tackle these problems.