Efficient power generating devices utilizing low intensity indoor lights via non-radiative energy transfer mechanism from organic ionic redox couples

Vaghasiya, Jayraj V.; Sonigara, Keval K.; Suresh, L. Padma; Panahandeh‐Fard, Majid; Soni, Saurabh S.; Tan, Swee Ching

doi:10.1016/j.nanoen.2019.03.086

Cited by 47 publications

(36 citation statements)

References 39 publications

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“…Higher electron lifetime values of coumarin co‐adsorbed DSSCs may due to higher surface coverage of RDAB3 and coumarin‐based co‐sensitizers on the TiO 2 films blocks the approach of I 3 ‐ ions to TiO 2 surface directly and diminish the recombination of electrons with tri‐iodide ions. Voc depends on the electron lifetime (τ CB ) on CB of TiO 2 and larger the τ CB leads to increasing the Voc …”

Section: Resultsmentioning

confidence: 99%

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Amine functionalized homoleptic ruthenium(II) sensitizer for dye‐sensitized solar cells: A combined effect of ancillary ligands and co‐sensitization

et al. 2019

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Summary In this work, we propose a homoleptic ruthenium(II) complex, [Ru(dabpy)3]Cl2 (RDAB3) containing amine functionalized electron donating anchoring units for DSSCs. The DSSCs were co‐sensitized by coumarin‐based thiophene (CT) and indole (CI) units. The presence of four ancillary amine groups in RDAB3 influences its photovoltaic performance and the introduction of coumarin‐based co‐sensitizers significantly enhances the efficiency. The fabricated DSSCs were explored by UV‐Visible absorption, photocurrent‐voltage assessments, and impedance spectral studies. Co‐sensitized DSSCs showed an improved photovoltaic efficiency than the device sensitized by RDAB3 alone. Under optimized condition, the device made up of RDAB3+CI exhibited a high Jsc = 9.9 mA/cm2 with Voc of 0.7 V, fill factor of 0.773, and solar to power conversion efficiency of 5.35% in standard global AM 1.5 solar irradiation. This performance is found to be higher than the DSSC sensitized with RDAB3 (η = 3.84%) fabricated under same circumstances.

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Section: Resultsmentioning

confidence: 99%

“…Voc depends on the electron lifetime (τ CB ) on CB of TiO 2 and larger the τ CB leads to increasing the Voc. [32][33][34][35]…”

Section: Electrochemical Impedance Spectral (Eis) Studiesmentioning

confidence: 99%

Amine functionalized homoleptic ruthenium(II) sensitizer for dye‐sensitized solar cells: A combined effect of ancillary ligands and co‐sensitization

et al. 2019

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“…All experimental and theoretical spectra were obtained in THF solvent. In Figure 4, it can be observed that the inclusion of the azomethine group in the π-bridge increases the conjugation of π bonds, which promotes a bathochromic displacement of λ max [52,54,55,56,57,58], except in TPAZ6. Regarding the oscillator strength (f) reported in Table 2, a significant variation was not observed with the inclusion of azomethine.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Study of the Effect of Different π Bridges Including an Azomethine Group in Triphenylamine-Based Dye for Dye-Sensitized Solar Cells

et al. 2019

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Ten molecules were theoretically calculated and studied through density functional theory with the M06 density functional and the 6-31G(d) basis set. The molecular systems have potential applications as sensitizers for dye-sensitized solar cells. Three molecules were taken from the literature, and seven are proposals inspired in the above, including the azomethine group in the π-bridge expecting a better charge transfer. These molecular structures are composed of triphenylamine (donor part); different combinations of azomethine, thiophene, and benzene derivatives (π-bridge); and cyanoacrylic acid (acceptor part). This study focused on the effect that the azomethine group caused on the π-bridge. Ground-state geometry optimization, the highest occupied molecular orbital, the lowest unoccupied molecular orbital, and their energy levels were obtained and analyzed. Absorption wavelengths, oscillator strengths, and electron transitions were obtained via time-dependent density functional theory using the M06-2X density functional and the 6-31G(d) basis set. The free energy of electron injection (ΔGinj) was calculated and analyzed. As an important part of this study, chemical reactivity parameters are discussed, such as chemical hardness, electrodonating power, electroaccepting power, and electrophilicity index. In conclusion, the inclusion of azomethine in the π-bridge improved the charge transfer and the electronic properties of triphenylamine-based dyes.

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“…Thus, the conductivity of this conventional electrolyte (I -/I 3 -) can be increased from the outside with additional salts, especially in recent years significant studies have been achieved by adding salt structures containing imidazole rings to the electrolyte solution [9,[14][15][16]. Successful results have also been achieved with solid electrolytes, in which imidazole-derived compounds are used without additional additives or redox couple [17,18]. The general opinion of these studies is that the presence of alkyl chains of imidazolium salts may have a significant effect on performance.…”

Section: Introductionmentioning

confidence: 99%

Efficiency enhancement with chloride to iodide ion exchange of benzimidazolium salt as a redox mediator

Dayan¹,

Karataş²,

Alıcı³

et al. 2021

Turk J Chem

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The new benzimidazolium derivative (SM-1) salt with ion exchange from the (SM-0) was fabricated and characterized by proton-nuclear magnetic resonance ( 1 H-NMR), carbon-nuclear magnetic resonance ( 13 C-NMR), Fourier-transform infrared spectroscopy (FT-IR), electrospray ionization (EIS-MS), thermal analysis (TG), cyclic voltammetry (CV), and ultraviolet-visible spectroscopy (UV-vis), for electrolytes (liquid or dried) in the DSSC charge transportation mechanism. Also, the influence of ion exchange from chloride to iodine in the synthesized electrolytes, compared to other electrolytes (conventional or commercial), was investigated about DSSC performance efficiency. When using as a liquid electrolyte (SM-1), the power conversion efficiency (ƞ) of the working DSSC device was recorded as 1.980% and it was observed that the performances of DSSCs increased up to 56% when comparing dried electrolyte for SM-1 without conventional redox material (I - /I 3 - ). In the future, different molecular modifications of this type of benzimidazole derivatives or mixtures with conventional redox couples may further improve the performance of DSSC devices.

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Efficient power generating devices utilizing low intensity indoor lights via non-radiative energy transfer mechanism from organic ionic redox couples

Cited by 47 publications

References 39 publications

Amine functionalized homoleptic ruthenium(II) sensitizer for dye‐sensitized solar cells: A combined effect of ancillary ligands and co‐sensitization

Amine functionalized homoleptic ruthenium(II) sensitizer for dye‐sensitized solar cells: A combined effect of ancillary ligands and co‐sensitization

Theoretical Study of the Effect of Different π Bridges Including an Azomethine Group in Triphenylamine-Based Dye for Dye-Sensitized Solar Cells

Efficiency enhancement with chloride to iodide ion exchange of benzimidazolium salt as a redox mediator

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