Abstract
A novel efficient metal-free sensitizer CVTC-H-CVTP containing asymmetric double D-π-A chains was designed and synthesized for application in dye-sensitized solar cells (DSSCs). The photophysical and electrochemical properties of the target molecule were investigated systematically through comparison of dyes with different single D-π-A structures. In contrast, the sensitizer CVTC-H-CVTP provides improved Jsc and Voc because of wider range of spectral absorption and higher absorption intensity which leads to better photoelectricity conversion efficiency. Therefore, dye with asymmetric double D-π-A shows the most efficient photoelectricity conversion efficiency of 3.20% (Unoptimized, VOC = 0.66 V, JSC = 6.51 mA/cm2, and FF = 74.72%) under simulated AM 1.5 irradiation (100 mW/cm2).
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