| 초록 |
Dye-sensitized nanocrystalline TiO2 solar cells (DSSCs) have attracted considerable interest because of their high conversion of sunlight to electricity and easy fabrication. To overcome the prohibitive cost of ruthenium metal complexes, several groups have developed metal free sensitizers and obtained efficiencies in the range of 5-8%. However, a major factor for the low photoconversion efficiency of many organic dyes in dye-sensitized solar cell is due to the formation of dye aggregates on the semiconductor surface. Therefore, for obtaining efficient photoconversion based on organic dyes, aggregation needs to be avoided through the structural modification of the dye. Another important issue for organic dyes is the stability, which are generally less stable than metal complexes for redox reactions due to formation of unstable radicals. |
