| 초록 |
Organic dyes have many advantages as dyes for DSSCs, such as higher molar absorption coefficients, the wide variety of the structures. Thus, We synthesized three organic dyes (N-TPA, F-TPA, and F-TPA-T) based on the triphenylamine (TPA) moiety as an electron donor and cyanoacrylic acid moiety as an electron acceptor to study the effect of molecular structure on the performance of the resulting dye-sensitized solar cells devices. The electron donor group was modified with the 9-fluorenylidene substituent and the thiophene unit was introduced as a π-conjugated bridge. The F-TPA-T sensitized cell showed the highest overall conversion efficiency of 4.25 % (Jsc : 10.5 mA/cm2, Voc : 0.70 V, FF : 0.58), while the N-TPA sensitized cell showed the lowest value of 3.26 % (Jsc : 6.55 mA/cm2, Voc : 0.77 V, FF : 0.64) among the cells based on the three organic dyes, as compared to 5.12 % for the cell based on the N719 dye (Jsc : 13.0 mA/cm2, Voc : 0.69 V, FF : 0.57) under AM 1.5 illumination. |
