DFT and TD-DFT optoelectronic study on hybrid alizarin-carbazol based dyes incorporated on titanium dioxide (TiO2) for dye sensitized solar cell application

• Published in: Inorganic chemistry communications Vol. 162; p. 112153
• Main Authors: Ahmadi, Yavar, Teymourinia, Hakimeh, Hosseininezhad, Seyedmohammad, Ramazani, Ali
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-2024
• Subjects: Alizarin; Carbazol; Dye Sensitized Solar Cells; TD-DFT; Carbazol; Dye Sensitized Solar Cells; Alizarin; TD-DFT
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2024.112153

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•Six BODIPY-based alizarin-carbazol dyad dyes with different π-spacers have been investigated using DFT and TD-DFT calculations to understand their application for DSSC.•The photophysical and photo-electrochemical properties of the designed dyes were improved by introduction of electron-rich heterocyclic rings as a π-spacer moiety, which caused decrease in band gap of the designed dyes and as a result the red-shifting of light absorption spectra and the energy conversion efficiency of the DSSCs.•The interactions between the dye and semiconductor through bidendate chelating structure of two hydroxyl groups of alizarin part of dyes over TiO2 molecule were studied in details.•This study to give perspectives for future developments and optimization of new and more efficient organic dyes for DSSCs.
The optical, electronic and structural properties of six hybrid alizarin-carbazol based dyes with different π-spacers before and after binding to a TiO2 were studied in detail by using DFT and TD-DFT calculations to understand their application in dye-sensitized solar cells (DSSCs). On the basis of the isolated dyes, energy levels, frontier molecular orbitals, optical properties, and the interactions of dyes and TiO2 semiconductors were investigated. Our results show that the photophysical and photo-electrochemical properties of designed dyes were improved by introduction of electron-rich heterocyclic rings as a π-spacer moiety, which led to a reduction in the designed dyes band gap and as a result of light absorption spectra red-shifting and the DSSCs energy conversion efficiency. This study is expected to give perspectives for future developments and optimization of new and more efficient organic dyes for DSSCs.