Abstract

In this study, polyethylene glycol (PEG) and natural dye were employed to make the liquid electrolyte media for solar cells. To prepare varied amounts of dye, the yellow dye of the flowers was extracted using diluted ethanol via ionized water. To produce a constant concentration of all polymer liquids, 10g of PEG dissolves in 1000 ml of solvents including: (di-water, dilute dye, and concentrated dye) individually. The viscosity of solutions was determined using an Ostwald viscometer at various temperatures. Optical parameters such as transmittance, absorbance, and indirect energy gap were investigated utilizing the ultraviolet spectrum. The results reveal that increasing the temperature causes the viscosity decreases and the solar cell efficiency increases. When the dye concentration is increased, the absorbance and absorption coefficient increase, while the transmittance decreases. After adding the concentrated dye, the energy gap of liquid PEG reduces from 1.4 eV to 0.6 eV. PEG with concentrated dye, on the other hand, is the best sample based on the energy gap value. As a result, four concentrations of PEG liquid were prepared: (0.02, 0.025, and 0.03) w/v concentrations, followed by the addition of the concentration dye in the same quantity for each concentration of PEG liquid. Four prepared liquids were tested for viscosity. The results showed that the viscosity of PEG + concentrated dye decreased as the PEG concentration was increased. When the concentration of PEG solution without dye is increased, the viscosity of PEG liquids increases.