Density Functional Theory Study on D-pi-A-type Organic Dyes Containing Different Electron-Donors for Dye-Sensitized Solar Cells

作者：Song Jing^*; Xu Jie

来源：Bulletin of the Korean Chemical Society, 2013, 34(11): 3211-3217.

DOI：10.5012/bkcs.2013.34.11.3211

• Dye-sensitized solar cells
• Density functional theory
• D-pi-A
• Organic dyes
• Absorption spectra

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of three D-pi-A-type organic dyes (C1-1, D5 and TH208) containing identical pi-spacers and electron acceptors, but different aromatic amine electron-donating groups (tetrahydroquinoline, triphenylamine and phenothiazine). The coplanar geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating ability of tetrahydroquinoline is stronger than those of triphenylamine and phenothiazine. The computed orbital energy levels of these dyes confirm that the electrons could be injected from the excited dyes to the semiconductor conduction band and the oxidized dyes could be reduced effectively by electrolyte. The TD-DFT results show that the CAM-B3LYP/6-31+G(d, p) is suitable for calculating the absorption spectra. The first absorption band for these dyes is assigned to the HOMO -> LUMO and HOMO-1 -> LUMO transitions.

• 出版日期2013-11-20
• 单位武汉纺织大学