The fabrication of DSSC TiO2 transparent thin layer with natural dye sweet potato (Ipomoea batatas L.)

Abstract

TiO2 semiconductor materials as working electrodes are commonly used in DSSC fabrication. One type of TiO2 used in DSSC fabrication is a paste form. In this study aims to determine the effect of the viscosity level of TiO2 paste. The deposition of a TiO2 transparent thin film using spin coating method with 450 °C heating temperature. Preparation of TiO2 paste was done by mixing TiO2 and ethanol by comparison (1:1, 1:3, 1:5). DSSC fabrication is characterized by an I-V test to determine the efficiency value. Sweet potato dyes used from the anthocyanin type. Preparation of sweet potato dye by mixing the sweet potato into a mixture of solution between methanol, distilled water, and acetic acid with the ratio of solution (1:3:5). UV-Vis spectrophotometer characterized the results of sweet potato extraction. In the test results I-V the most significant efficiency value is obtained at a 1: 1 ratio with an efficiency value of 1.92 x 10−2 and the absorbance peak obtained at 532 nm wavelength.