DefinePK

Abstract

This paper optically characterized anthocyanins and betalains pigments in blueberry and dragon fruit, respectively, to function asa dye sensitizer in dye-sensitized solar cell (DSSC). Ultrasonic extraction treatment was enforced to cocktail dye with a temperature, time and frequency rating of 30 oC, 30 minutes and 37 Hz, respectively. Different extracting solvent from ethanol and distilled water were used to observe the absorption spectra by using UV-Vis absorption spectroscopy. Fourier transforms infrared (FT-IR) were used to characterize the functional components of dyes. From FT-IR spectra, cocktail dye represented the existing of carboxyl group correspond to the CO=OH stretching vibrations which is an important functional group in betalains pigment. From UV-Vis absorption spectra, the cocktail dye extracted with ethanol (M-Etha), compared to DI- water (M-DI) has the peak absorbance of 500 nm with broader absorbing range in visible light spectrum (450-600 nm). As for the photon energy, results show a narrow energy gap of 2.49 eV with higher absorption coefficient of 2.17 km-1.