| 초록 |
An organic sensitizer with a multi-anchoring system in a chromophore is a versatile methodology for enhancing the stability and photon-to-current efficiency of dye-sensitized solar cells (DSSCs). The derivatives of triphenylamine containing different numbers of cyanocarboxylic acids in the chromophore (TPA3T1A ~ 3A) were synthesized to determine the correlation between the number anchoring groups and the photovoltaic properties as photosensitizers for DSSCs. The adsorption properties of the organic dyes on the TiO2 electrode were examined by ATR-FT-IR, which revealed a TPA3T1A-containing mono-anchoring system adsorbed on the electrode surface in monodentate ester-type mode, and three carboxylic acids in TPA3T3A adsorbed in bidentate bridging mode. Enhanced long-term stability and electron life time were observed in the DSSCs containing a tri-anchoring system compared to mono- and bi-anchoring systems because of the strong adsorption properties and the effect of blocking the electrolyte from the TiO2 electrode surface. |
