This work focused on synthesizing of the electro active two small molecules ((2E)-2- acrylic acid (MC-28)) consisting of planar molecule part with different absorptions-emissions energy levels and applications of these small molecules in DSSC device to understand their performance. The optical properties of MC-20 and MC-28 were determined by UV-Vis absorption and fluorescence measurements, and electrochemical properties were illuminated by cyclic voltammetry (CV). The 1 H-NMR spectroscopy is used to characterize the molecular structure of the synthesized materials. The obtained electrochemical and optical data were used to calculate Highest Occupied Molecular Orbital-Lowest Unoccupied Molecular Orbital (HOMO-LUMO) band gaps. As a result, these synthesized molecules have been used in Dye sensitized solar cells (DSSCs). The performance of these materials was analyzed by calculating the efficiency of the DSSC device. Obviously, it can be said that linking different donor atom S to the molecule has a little positive effect on photovoltaic efficiency.
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