Insights into the role of D-A-π-A type pro-aromatic organic dyes with thieno[3,4-b]pyrazine as A acceptor group into dye-sensitized solar-cells. A TD-DFT/periodic DFT study

Katherine Paredes-Gil, Dayán Páez-Hernández, Ramiro Arratia-Pérez, Fernando Mendizábal

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Time-dependent density functional theory (TD-DFT)/periodic DFT calculations were performed to determine the role of pro-aromatic organic D-A-π-A type dyes (the NL1-NL17 family) with Thieno[3,4-b]pyrazine (Tpy) as A acceptor group into dye-sensitized solar-cells (DSSC). This work presents a discussion of the ground and excited states of these dyes along with the aromaticity analysis and the electron injection step using a [email protected](TiO2)72 model. The results suggest that the pro-aromatic behavior increases from the thiophene ring to the pyrazine when an acceptor π-bridge such as phenyl is used. This strong pro-aromaticity is also reflected in the electron injection step, studied using a 3x2 3 layer (TiO2)72 slab model. The resulting adsorption energies (ΔEads and ΔGads) and the electron injection (ΔGinject) in the stablest coordination mode, Bid_CN_COOH, indicate that the redox reaction (Dye* ➔ Dye+ + e) is stronger and more spon than the adsorption reaction (Dye+ + TiO2 [+e] ➔ [email protected]2) in the electron injection. In this way, the highest efficiency of NL6 and NL12 is a consequence of the more significant pro-aromatic characteristics and the more spontaneous redox process. Finally, these NL dyes are promising in the molecular engineering of D-A-π-A metal-free types dyes.

Original languageEnglish
Article numbere26108
JournalInternational Journal of Quantum Chemistry
Volume120
Issue number5
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Keywords

  • D-A-π-A dyes
  • metal-free organic dyes
  • pro-aromatic molecules
  • solar cell
  • TiO surface

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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