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Open Access Optical properties and microstructure of TiN thin films before and after annealing

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Titanium nitrides, oxides and oxynitrides (TiN, TiO2, and TiN x O y ) are potential materials for several electronic and optical applications. In this work, TiN thin films are deposited by using RF magnetron sputtering (reactive sputtering type) with a pure titanium target, argon (Ar), and nitrogen (N2) gases. All sputtered TiN thin films were subsequently annealed in air at 800 C for 2 hours. The microstructure and the optical properties (absorbance and emittance) of sputtered TiN thin films are studied before and after annealing. The optical properties of all thin films before and after annealing are characterized by spectrophotometer, and Fourier transform infrared spectroscopy (FTIR). The morphology and structure are studied by scanning electron microscope (SEM), atomic force microscope (AFM), X-ray diffraction (XRD), and Raman spectroscopy. It was found that the optical absorbance of sputtered TiN thin films is changed after annealing and increased to 94% with a stable profile in ultraviolet (UV), visible range and near infrared (IR) ranges. The initial polycrystalline TiN microstructure is transformed after annealing in air at 800 °C for 2 hours to rutile TiO2 nanofibers. These nanofibers caused light scattering inside the thin film, which improved the optical absorbance.

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Keywords: MICROSTRUCTURE; OPTICAL PROPERTIES; PVD SPUTTERING; SELECTIVE ABSORBER; TIN; TIO2

Document Type: Research Article

Publication date: February 1, 2019

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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