| dc.description.abstract | Dye-sensitized Solar Cells (DSSCs) have attracted intense interest due to their environmental friendly nature, low cost of production, and easy fabrication. The sensitizer is a key component of DSSC and have been studied widely due to its important effects in light harvesting, charge separation, and power conversion efficiency. In addition to Ru-based dyes, metal-free organic dyes have also received great attention for their unique advantages such as higher molar extinction coefficients, low cost of materials, facile molecular designs, and easy syntheses process.
In my research, a series of tertiary amine dyes (TD01, TD02, and TD03) consisting of different number (one, two, and three, respectively) of D-π-A units which are connected through oxygen of donor group to alkyl moiety of tertiary amine have been synthesized. Presumably, the increased D-π-A fragment of each dye could enhance the absorption intensity in UV-visible spectrum of the respected dye, having a chance to transform more absorbed photons into electrons, and thus improve Jsc.
The dye TD03 with its three D-π-A units in three directions from central amine core, is expected to spread over effectively and bind to TiO2 surface and minimize the dye aggregation if any. Further, the bridging ethyl groups between D-π-A division and central nitrogen can be served as a barrier at TiO2-electrolyte interface, thereby retarding electron recombination and enhancing Voc.
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