Abstract
Abstract Research has been carried out in the form of the synthesis of a thin film of Titanium Dioxide with a mixture of Fluorine and Indium doping. The purpose of this research is to obtain the characteristics of a thin filmphotocatalyst with a crystal structure and optical properties that can be applied to solar cell components. This research was carried out in two stages, namely the synthesis stage and the thin filmcharacterization stage. The TiO 2 thin film synthesis stage is through the substrate preparation process, sol-gel solution preparation, thin film deposition, and heating process, while the thin-film characterization stage uses X-Rays Diffraction (XRD) to identify crystal properties and UV-VisSpectrophotometer to determine optical properties of a thin film of TiO 2 and TiO 2 :(F+In). Based on data analysis and discussion, XRD test results showed that the thin film of TiO 2 :(F+In) has an Anatase phase with a tetragonal shape, and has an average crystal size that is getting smaller from 23.14 to 12.17 nm. Based on the results of research, data analysis, and discussion, it was found that the sample of TiO 2 : (F+In) has characteristics that can be used as materials in the development of solar cell components. These characteristics are like 1). havenano-sized particles, 2). have a low transmittance value and high absorbance in absorbing sunlight, and 3). have a low activation energy and energy gap (direct and indirect).