| 초록 |
Dye-sensitized solar cell (DSSC) has emerged as one of the most attractive photovoltaic devices because it offers the possibility of low-cost conversion of photoenergy. Ruthenium complex and porphyrin dyes are currently the most efficient dyes. These dyes, however, are costly and hard to prepare in high yields, which have led to the evolution of metal-free organic dyes. Organic dyes exhibit not only higher extinction coefficient, but simple preparation, structure modification and purification procedure with a low cost. In this talk, an improvement of the performance of the organic dyes as sensitizers for DSSC by fine tuning the dye chemical structures will be presented. A series of organic dipolar compounds with different molecular configurations of D-D--A, D(dendron)--A, D--A--A, D- (D)-A, D--A-(D)-A bearing triarylamine, carbazole and carbazole dendrons as donor moiety were designed, synthesized and investigated. The relationships between structure of these dyes and properties and cell performances will be drawn and discussed. The choice of -linker, auxiliary acceptor and terminal acceptor are found to be crucial in designing of the dye. Some of these dyes show power conversion efficiencies surpass that of the Ru-based device measured under similar conditions, indicating a high potential candidate for a commercial use. |
