H. Hakan Yudar

Optical, Surface and Microstructural Properties of Li4Ti5O12 Thin Films Coated by RF Magnetron Sputtering

ABSTRACT Li4Ti5O12 thin films were deposited on glass substrates by the RF magnetron sputtering method in an argon gas atmosphere at different powers. Some properties of the coated Li4Ti5O12 films were examined using some techniques. Structural characteristics of the produced Li4Ti5O12 films were investigated by X-ray diffraction. The Li4Ti5O12 phases were identified as (311) and (222). The surface morphology of the produced Li4Ti5O12 films was investigated using an atomic force microscope. The transmittance and the absorbance were measured using a UV–vis spectrophotometer. The transmittance values were around 88% and 90%. The absorbance values were approximately 0.053 and 0.048. The film thickness values were 140 and 50 nm. The transparency values of the produced films were high. The optical band gap values of the produced LTO films were calculated as ∼3.8 eV. The refractive index and the reflectance spectra values of samples were determined using interferometer measurements. The refractive index values were 1.51 and 1.44 at 550 nm, respectively.

A new technique for transparent solid state Li3PO4 electrolyte layer growth: thermionic vacuum arc technique

In this research, a Li3PO4 electrolyte thin film was deposited on glass substrate under high vacuum condition by means of the thermionic vacuum arc (TVA) method. A new deposition mechanism for solid-state battery applications is presented. The physical properties of the produced sample were analyzed with X-ray diffraction device, spectrophotometer, interferometer, scanning electron microscope, and atomic force microscope. In order to understand the surface features of the thin film, AFM analysis was carried out by non-contact mode at ambient condition. The formation of microstructures were monitored clearly by the AFM device. The UV–Vis spectrophotometer result showed that produced film has a high transmittance in the visible region and near infrared region.