Molecular engineering of D-A-π-A dyes with 2-(1,1-dicyanomethylene)rhodanine as an electron-accepting and anchoring group for dye-sensitized solar cells

Mao, Jiangyi; Zhang, Xiaoyu; Liu, Shih-Hung; Shen, Zhongjin; Li, Xing; Wu, Wenjun; Chou, Pi‐Tai; Hua, Jianli

doi:10.1016/j.electacta.2015.05.003

Cited by 32 publications

(6 citation statements)

References 28 publications

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“…Surprisingly, the cell comprising 2a was characterized by the highest PCE and exhibited the shortest τ, while the cell based on 1b showed the lowest PCE and the longest τ. Furthermore, no correlation between VOC and τ was observed, contrary to literature reports [2,33,60]. Interestingly, 2a showed the highest VOC among the tested dyes and the shortest electron lifetime, which is rather unusual.…”

Section: Electrochemical Impedance Spectroscopycontrasting

confidence: 88%

“…The determined IPs were only slightly varied, probably due to weak conjugation of the triphenylamine group with the other parts of the molecules, as shown by the theoretical calculations. Very close values have been reported for similar triphenylamine-based dyes [31][32][33][34][35]. It is noteworthy that the experimental values correlate very well with the theoretically calculated ones.…”

Section: Electrochemistrysupporting

confidence: 84%

“…Consequently, the estimated electron lifetime values (τ) may be calculated according to the equation τ = (2πf) −1 , using the frequency value at the maximum phase angle (f) from the low-frequency region of the Bode phase plot presented in Figure 8. Longer electron lifetime at the TiO2/dye/electrolyte interface is desired since it implies a more efficient prevention of charge recombination and a more plausible generation of the photocurrent [33,59]. From among the examined dyes, compounds 1b and 2b exhibited the longest τ (see Table 4), while 2a the shortest.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

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2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

et al. 2020

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Very recently, we have reported the synthesis and evaluation of biological properties of new merocyanine dyes composed of triphenylamine moiety, π-aromatic spacer, and rhodanine/2-thiohydantoin-based moiety. Interestingly, 2-thiohydantoin has never been studied before as an electron-accepting/anchoring group for the dye-sensitized solar cells (DSSCs). In the presented study, we examined the applicability of 2-thiohydantoin, an analog of rhodanine, in DSSC technology. The research included theoretical calculations, electrochemical measurements, optical characterization, and tests of the solar cells. As a result, we proved that 2-thiohydantoin might be considered as an acceptor/anchoring group since all the compounds examined in this study were active. The most efficient device showed power conversion efficiency of 2.59%, which is a promising value for molecules of such a simple structure. It was found that the cells’ performances were mainly attributed to the dye loading and the ICT molecular absorption coefficients, both affected by the differences in the chemical structure of the dyes. Moreover, the effect of the aromatic spacer size and the introduction of carboxymethyl co-anchoring group on photovoltaic properties was observed and discussed.

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Section: Electrochemical Impedance Spectroscopycontrasting

confidence: 88%

Section: Electrochemistrysupporting

confidence: 84%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

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2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

et al. 2020

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“…With AVA and AB, the work function of the TiO 2 shifted to ≈4.16 and ≈4.14 eV, respectively). The –COOH group from the bifunctional cations can attach with TiO 2 layer by chemical bonding as we learnt from dye‐sensitized solar cells . This adds a surface dipole moment on TiO 2 and thus varied the energy level.…”

Section: The Characterization Of Tio2 Films Modified With Different Fmentioning

confidence: 99%

Improved Performance of Printable Perovskite Solar Cells with Bifunctional Conjugated Organic Molecule

et al. 2018

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A bifunctional conjugated organic molecule 4-(aminomethyl) benzoic acid hydroiodide (AB) is designed and employed as an organic cation in organic-inorganic halide perovskite materials. Compared with the monofunctional cation benzylamine hydroiodide (BA) and the nonconjugated bifunctional organic molecule 5-ammonium valeric acid, devices based on AB-MAPbI show a good stability and a superior power conversion efficiency of 15.6% with a short-circuit current of 23.4 mA cm , an open-circuit voltage of 0.94 V, and a fill factor of 0.71. The bifunctional conjugated cation not only benefits the growth of perovskite crystals in the mesoporous network, but also facilitates the charge transport. This investigation helps explore new approaches to rational design of novel organic cations for perovskite materials.

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“…The effective lifetime s eff is calculated for the IA-7, MH-12, and MH-13 sensitized devices to be IA-7 (8.93 ms) > MH-13 (5.87 ms) > MH-12 (2.0 1 ms), respectively. On a fundamental level, a longer electron lifetime indicates better suppression of back reactions between the injected electrons and the electrolyte, which ordinarily leads to improvement of the V OC 39,40 as shown in Table 1. The increase in V OC value for the IA-7 complex could be caused by the retardation between injected electrons and oxidized species in the electrolyte.…”

Section: Electrochemical Impedance Studies (Eis)mentioning

confidence: 99%

The molecular engineering, synthesis and photovoltaic studies of a novel highly efficient Ru(ii) complex incorporating a bulky TPA ancillary ligand for DSSCs: donorversusπ-spacer effects

Abdellah

El‐Shafei

2020

RSC Adv.

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Molecular engineering of D-A-π-A dyes with 2-(1,1-dicyanomethylene)rhodanine as an electron-accepting and anchoring group for dye-sensitized solar cells

Cited by 32 publications

References 28 publications

2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

2-Thiohydantoin Moiety as a Novel Acceptor/Anchoring Group of Photosensitizers for Dye-Sensitized Solar Cells

Improved Performance of Printable Perovskite Solar Cells with Bifunctional Conjugated Organic Molecule

The molecular engineering, synthesis and photovoltaic studies of a novel highly efficient Ru(ii) complex incorporating a bulky TPA ancillary ligand for DSSCs: donorversusπ-spacer effects

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