Volume 8, Issue 1, June 2020, Page: 1-10
Acceptor/Donor End Capped Phenylene-Thiophene Co-oligomers Toward Efficiencies Organic Electronic Devices
Abdelkader Hlel, Department of Physics, Preparatory Institute for Engineering Studies, University of Monastir, Monastir, Tunisia
Saber Ghomrasni, Department of Physics, Faculty of Sciences, University of Monastir, Monastir, Tunisia
Walid Taouali, Department of Physics, Faculty of Sciences, University of Monastir, Monastir, Tunisia
Kamel Alimi, Department of Physics, Faculty of Sciences, University of Monastir, Monastir, Tunisia
Received: Nov. 11, 2019;       Accepted: Dec. 3, 2019;       Published: Jan. 4, 2020
DOI: 10.11648/j.ijctc.20200801.11      View  73      Downloads  30
In this paper, geometrical (in ground and excited states), electronic, optical and charge transfer properties, (ionization potentials (IP), electron affinities (EA) and HOMO-LUMO gaps (ΔEH-L), as well as the lowest excitation energies (Eex) and reorganization energies) of the phenylene-tiophene oligomers are studied by the density functional theory (DFT) and Time-dependent DFT approaches. Based on the density functional theory (DFT/B3LYP and CAM –B3LYP functional with 6-31G (d,p) basis set), we will highlight the effect of terminal acceptor/donor (CN, NO2, and CF3) /OCH3, N(CH3)2 substituents on thiophene-phenylene derivatives. The excited state indicates more planar structures of the co-oligomers, which leads to a decrease in the (HOMO-LUMO) gap compared with the ground state, especially when the acceptor character increases. Furthermore, the vinyl spacer and cyanide ((–CN) functional group (Compound C8) stabilize the LUMO levels of energy and improve the transport properties of the thiophene-phenylene derivatives. Comparing with the donor groups, the results show that the electron withdrawing substituents are remarkable on the energy levels of the frontier molecular orbitals, and on the transport charge proprieties in these co-oligomers. Thus, the LUMO energy levels become more stabilized for co-oligomers having more acceptor moieties and the HOMO–LUMO energy gap is reduced, therefore, the improvement of the conduction properties of these species is, then, observed. Moreover, the absorption spectra, computed in the presence or not of solvent at PCM model in chloroform, shows that the increase of acceptor character induces a red shift and important absorption intensity. The decrease injection barrier and smaller reorganization energies are revealing that our designed co-oligomers would be an efficient hole as well as electron transfer materials. The predicted values have shown that the designed derivatives would be efficient for the organic field effect transistors, photovoltaics and light emitters.
Thiophene-phenylene, DFT, CAM–B3LYP, B3LYP, Optical Absorption, Reorganization Energies
To cite this article
Abdelkader Hlel, Saber Ghomrasni, Walid Taouali, Kamel Alimi, Acceptor/Donor End Capped Phenylene-Thiophene Co-oligomers Toward Efficiencies Organic Electronic Devices, International Journal of Computational and Theoretical Chemistry. Vol. 8, No. 1, 2020, pp. 1-10. doi: 10.11648/j.ijctc.20200801.11
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