Enhancement Enhancement of Dye Sensitized Solar Cell Performance using Blocking Layer TiO2 by Sputtering Method

Abstract

Abstract. In this study, the efficiency of dye-sensitized solar cells (DSSC) was improved through the use of a multilayer blocking layer (BL) of TiO₂. Multilayer BL TiO₂ has been successfully deposited using the sputtering and spin coating methods. Based on the XRD results, the crystal size increased from 17.24 to 25.86 nm for multilayer BL TiO₂. Based on the SEM results, the morphology of all samples is quite uniform and suitable for the blocking layer, and the porosity of BL TiO₂ is smaller than that of multilayer BL TiO₂. Based on the UV-Vis absorbance results, the layer shifted from a wavelength of 248 to 257 nm, indicating a blue shift. The estimated energy gap decreased from 3.58 to 3.55 eV. Multilayer BL TiO₂ shows a high efficiency of 4.49% compared to BL TiO₂ with an efficiency of 2.50%. Additionally, based on the EIS results, the R_ct decreased from 66.41 to 12.53 Ω.

Keywords: DSSC, multilayer blocking layer, spin coating, sputtering, TiO₂.