The use of bio liquid electrolytes in solar cells improves the efficiency of the cell, reduces the
resulting electrostatic charge on the surface and reduces the potential leakage of solid electrolyte.
The research aims to prepare liquid electrolyte of polyvinyl alcohol in addition to yellow dye
extracted from flowers. The yellow dye of the flowers growing in Carthage, Tunisia, was extracted
using acetone and diluted with ionized water to prepare different concentrations of dye. Polyvinyl
alcohol was dissolved in 100 ml of various solvents (water, diluted dye and concentrated dye)
separately to obtain a constant concentration of all solutions 0.01 g / ml. optical. The optical
properties, including absorbance, transmittance, and energy gap using ultraviolet spectrum
were studied. Results proved that the optical properties including absorbance, absorption
coefficient increased with increasing dye concentration, transmittance decreased with increasing
of the pigment concentration. The energy gap decreases by increasing the concentration of the
dye and has the lowest value at the concentrated dye about 1.7 eV. However, when adding the
concentrated dye to the polyvinyl alcohol, the energy gap decreases from 4 eV to 1.8 eV.