| 초록 |
A series of coumarin dyes containing a low-band-gap chromophore of benzothiadiazole, which comprises a coumarin moiety as the electron donor and a cyanoacrylic acid moiety as electron acceptor in D-A-π-A system, were developed to use in dye-sensitized solar cells (DSSCs). The introduction of benzothiadiazole unit into the molecular frame distinctly makes the narrow bandgap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO), thus red-shifting the absorption peak. Their chemical structures were characterized by 1H-NMR, FT-IR, UV-vis absorption, and FAB-mass spectroscopies. Their electrochemical properties were studied by cyclic voltammetric measurement. The ground state geometries of the dyes have been optimized by DFT. The synthesis and characterization of organic D-A-π-A system coumarin dyes containing Electron-withdrawing benzothiadiazole for dye-sensitized solar cells will be presented. |
