| 초록 |
Organic dye-sensitized solar cells (DSC) have a great attention for their potential low cost, flexibility, and multicolor characters. Recently, diethienothiophene (DTT)-based dyes have shown a promising light harvesting efficiency in DSCs, even under very thin TiO2 layer condition (less than 2 μm) with ferrocene electrolyte system.1-3 However, as DTT-based dyes may not exhibit broad absorption region, modification of the structure can solve this problem. For this aim, we investigate on the electron donating group effects on the highest occupied molecular orbital of dihtineothiophene-based dyes, which can reduce the energy band gap. Three different types of dyes were designed with the introduction of proton (D1) , methoxy (D2), and carbazole (D3) units on HOMO positions of DTT-based dyes. For more discussions will be followed to prove this hypothesis. |
