Abstract
The electronic structure and absorption spectra of two D-π-A-type organic dyes with different anchoring groups have been investigated using density functional theory (DFT) and time-dependent density functional theory (TD-DFT). The effect of anchoring groups on the electronic absorption of the free dyes on (TiO2)9 has been studied for the two carbazole dyes (MK1 and MK2). Results from DFT calculations indicate that hydroxamic acid anchoring group in MK2 lead to much stronger intermolecular charge transfer and adsorption energies on (TiO2)9 cluster. The effect of four different XC functionals (B3LYP, ωB97xD, M06-2X, and CAM-B3LYP) on the transition energies has been tested in order to explore the valid functional for the studied system. The wavelength values from the ωB97xD/6-31+G** level of theory are in excellent agreement with experimental data so this functional was considered to calculate the electronic absorption of the two studied dyes. The highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), and the gap energy (H–L) of the studied dyes are slightly influenced by change of anchoring group. Results reveal that the LUMO energy levels of all studied dyes are higher than the conduction band (CB) of TiO2 (− 4.00 eV). Deprotonation process enhances the efficiency of dye-sensitized solar cells during decreasing adsorption energy of dyes with (TiO2)9 cluster.
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Acknowledgments
The authors acknowledge with thanks the technical support and funding by the Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah, under grant no. 130-491-D1435. The authors are also grateful to the HPCC (Aziz supercomputer) for the resources.
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Elroby, S.A., Jedidi, A. Density functional theory study on two D-π-A-type organic dyes containing different anchoring groups for dye-sensitized solar cells. Struct Chem 31, 1125–1135 (2020). https://doi.org/10.1007/s11224-020-01489-w
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DOI: https://doi.org/10.1007/s11224-020-01489-w