Abstract
A new series of organic donor–π–acceptor (D–π–A) dyes namely B1–6 with modification of donor groups by introducing thiophene (as D) and fluorene-connected carbazole on top of thiophene (as 2D–D) in phenylamine moieties, and with elongation of π-spacer unit of thiophene (1–3 units) in the π-spacer, were molecularly designed by using density functional theory (DFT) and time-dependent DFT. The nature of intramolecular charge transfer of all dyes was elucidated by means of frontier molecular orbital analysis, electronic structures, and absorption spectra to provide their potential use for dye-sensitized solar cells (DSSCs). The structural results show that the 2D–D–π–A dyes have a nonplanar structure on the D–D moiety that may suppress the aggregation of dye and yet maintain the conjugation in the whole D–π–A moiety. The systematically elongating π-spacer of B4–6 dyes with increasing number of thiophene group and the introducing 2D into D–π–A dyes give the redshift on absorption peak and broaden the absorption range, which are in excellent agreement with available experiment. Thus, this redshift improves their overall light-harvesting efficiency (LHE) better than the B1–3 dyes. Among the six dyes, B6 would have the best performance because it has the highest predicted LHE at the maximum absorption wavelength (λ max) and the suitable driving force ΔG inject of the electron injection from the excited state of dyes to the conduction band of TiO2. The prototype of DSSCs performance of selected dyes was further simulated using the chemisorption of dyes onto the (TiO2)38 cluster to reveal the nature of the electron injection mechanism. This current work is expected to assist in the molecular design of new metal-free organic dyes for use in DSSCs yielding highly efficient performance.
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Acknowledgments
The authors wish to thank Chiang Mai University and the National Research Council of Thailand for financial support and the Ministry of Energy for a grant to purchase computer hardwares. The computer facility at the Nanoscale Simulation Laboratory in the National Nanotechnology Center (NANOTEC), Pathumthani, and at the Department of Chemistry, Faculty of Science, Chiang Mai University, and Chiang Mai, Thailand, are also acknowledged.
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Frontier molecular orbitals of B1-B6 relevant to the excitation in absorbance determined by B3LYP/6-31G(d,p), and the superimposed set of all simulated absorption spectra (DOCX 779 kb)
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Namuangruk, S., Meeprasert, J., Jungsuttiwong, S. et al. Organic sensitizers with modified di(thiophen-2-yl)phenylamine donor units for dye-sensitized solar cells: a computational study. Theor Chem Acc 133, 1534 (2014). https://doi.org/10.1007/s00214-014-1534-1
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DOI: https://doi.org/10.1007/s00214-014-1534-1