Effect of Molecular-Level Insulation on the Performance of a Dye-Sensitized Solar Cell: Fluorescence Studies in Solid State

Saleh, Na’il; Al-Trawneh, Salah A.; Al-Dmour, Hmoud; Al-Taweel, Samir A.; Graham, John

doi:10.1007/s10895-014-1479-8

Cited by 9 publications

(12 citation statements)

References 42 publications

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“…This improvement in short circuit current and power conversion efficiency of our devices agree with previous reports (Haque et al, 2004; Handa et al, 2007; Choi et al, 2009). On the contrary to our previous work, the Z907/CB7-based solar cells show better performance than the reported DSSC device, which was based on the host-guest encapsulation of 5-[4-diphenylamino)phenyl]thiophene-2-cyanoacrylic acid (L1) inside β-CD hosts (Na'il Saleh et al, 2015).…”

Section: Resultscontrasting

confidence: 85%

“…The short circuit density, Jsc, of the CB7-containing device has increased from 0.29 mA/cm 2 to 0.43 mA/cm 2 , whereas its open circuit voltage, Voc, has reduced from 0.7 to 0.65 V in comparison with the device without CB7. Moreover, addition of CB7 has increased the power conversion efficiency of the final solar cell by more than 50% using the equation reported in our previous work (Na'il Saleh et al, 2015) (from 0.08 to 0.12%). This improvement in short circuit current and power conversion efficiency of our devices agree with previous reports (Haque et al, 2004; Handa et al, 2007; Choi et al, 2009).…”

Section: Resultsmentioning

confidence: 63%

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Enhanced Energy Conversion of Z907-Based Solar Cells by Cucurbit[7]uril Macrocycles

et al. 2019

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A dye-sensitized solar cell was constructed on the basis of encapsulating the ruthenium polypyridyl photosensitizer Z907 in the macrocycle cucurbit[7]uril (CB7). The work focuses on the photophysical properties of the new host-guest complexes in acetonitrile and water (volume ratio 1:9) and on the top of nanocrystalline titanium dioxide (TiO 2 ) electrode prior to the addition of poly(3-hexylthiophene) polymer and gold electrode. Complexation to CB7 in aqueous solutions has decreased the emission intensity and excited-state lifetime for metal-to-ligand charge transfer (MLCT) state at 650 nm by twofold because of collisional quenching, which opens a non-radiative deactivation channel. Similarly, a twofold decrease in the emission intensity and excited-state lifetime of MLCT at 750 nm on the top of TiO 2 electrodes was observed with the addition of CB7. Encapsulation of Z907 dye to CB7 host has, also, led to fourfold enhancement in the short circuit current and power conversion efficiency of the final solar cell. The results support the premise that host-guest complexation of CB7 facilitates faster electron injection from Z907 dye into the conduction band of TiO 2 electrodes.

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Section: Resultscontrasting

confidence: 85%

Section: Resultsmentioning

confidence: 63%

Enhanced Energy Conversion of Z907-Based Solar Cells by Cucurbit[7]uril Macrocycles

et al. 2019

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“…Photochemistry. 35 The fluorescence lifetimes were measured by time-correlated single-photon counting on a LifeSpec II spectrometer (Edinburgh Instruments) by using an EPL-375 picosecond diode laser (λ ex = 375 nm, repetition rate = 20 MHz, and instrument function = 30 ps) for excitation. The time-resolved emission (intensity of ∼1000−3000 counts/s) was collected (with a constant dwell time of 10 s) every 10 nm across the entire emission spectrum by a redsensitive high-speed PMT (Hamamatsu, H5773-04) detector.…”

Section: Methodsmentioning

confidence: 99%

Solubilization of Pyridone-Based Fluorescent Tag by Complexation in Cucurbit[7]uril

et al. 2019

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Aimed at further exploring the hosting properties of cucurbit[7]uril (CB7), we have exploited the spectroscopic and photophysical properties of a known fluorescent label as the guest molecule, namely, 3-cyano-6-(2-thienyl)-4-trifluoromethyl pyridine (TFP), in neat solvents. The formation of an inclusion host–guest complex with CB7 was checked by UV–vis absorption spectroscopy, and the value of binding constant (9.7 × 10 5 M –1 ) was extracted from the spectrophotometric data. The modulation of keto–enol equilibrium in TFP by the local environment is governed by the interplay between dimerization through intermolecular hydrogen bonding between individual solute molecules, favoring the enol form, and intermolecular hydrogen bonding between TFP and the surrounding solvents, favoring the keto form. Time-resolved fluorescence results established that the macromolecular CB7 host stabilizes preferentially the neutral enol form over the keto form of TFP. Unprecedentedly, our results reveal a linear dependence of the amplitudes of the extracted decay-associated spectra from the time-resolved fluorescence spectra of TFP on the sum of polarity/polarizability and hydrogen bonding parameters of the local environment, confirming that TFP at micromolar concentration in the CB7 complexes is experiencing a methanol-like environment. The results rationalized the 42-fold enhancement in the solubility of TFP in water media by complexation in CB7.

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“…The observed emission decay was reconvoluted then analyzed to extract the lifetime constant (τ) by the nonlinear least-squares method, which minimizes the χ 2 value. The FAST software (version 1.8.1) was used to perform the lifetime distribution analysis (LTD), which assumes the emission decays can be fitted by a series of exponential functions with more than 100 lifetime values and predetermined pre-exponential amplitudes …”

Section: Experimental Sectionmentioning

confidence: 99%

Formation of Noncovalent Complexes between Complex Mixtures of Polycyclic Aromatic Hydrocarbons (Asphaltenes) and Substituted Aromatics Studied by Fluorescence Spectroscopy

Faisal¹,

Solntsev

Kahs³

et al. 2021

Energy Fuels

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Quantification of the formation of molecular complexes between simple organic aromatic molecules is straightforward for pure components of definite composition; however, it becomes challenging when the interacting species are complex, intractable mixtures of thousands of polycyclic aromatic hydrocarbons (PAHs). Using the example of asphaltenes, a complex mixture of oil-derived PAHs, we demonstrate the potential of fluorescence spectroscopy for quantification of molecular processes that are at the core of their aggregation. It is found that small electron-deficient aromatic additives, especially surfactant-like additives with electron-withdrawing functional groups, interact strongly with the PAHs and lead to the formation of molecular complexes. Computational modeling revealed that as we increase the number of PAH molecules in the cluster, cohesive π–π stacking interactions between PAHs dominate in preference to adhesive hydrogen bonding or π–π stacking interactions between the PAHs and additives.

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Effect of Molecular-Level Insulation on the Performance of a Dye-Sensitized Solar Cell: Fluorescence Studies in Solid State

Cited by 9 publications

References 42 publications

Enhanced Energy Conversion of Z907-Based Solar Cells by Cucurbit[7]uril Macrocycles

Enhanced Energy Conversion of Z907-Based Solar Cells by Cucurbit[7]uril Macrocycles

Solubilization of Pyridone-Based Fluorescent Tag by Complexation in Cucurbit[7]uril

Formation of Noncovalent Complexes between Complex Mixtures of Polycyclic Aromatic Hydrocarbons (Asphaltenes) and Substituted Aromatics Studied by Fluorescence Spectroscopy

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