Effect of mono- and di-anchoring dyes based on o,m-difluoro substituted phenylene spacer in liquid and solid state dye sensitized solar cells

Raju, Telugu Bhim; Vaghasiya, Jayraj V.; Afroz, Mohammad Adil; Soni, Saurabh S.; Iyer, Parameswar Krishnan

doi:10.1016/j.dyepig.2019.108021

Cited by 22 publications

(8 citation statements)

References 46 publications

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“…Impedance spectroscopy (IS) is considered as a small perturbation technique because it can affect the sample without modifying it irreversibly in most cases. This non-destructive technique is used to explore dynamics such as relaxation times, energy storage, and dissipation energy processes in both electrochemical systems and solid-state devices. − The working principle of IS is to monitor the response of a sample to an electrical field as a function of frequency (ω). The perturbation or input signal is an AC voltage applied around a given steady state.…”

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confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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Metal halide perovskite single crystals (MHPSCs) are gaining enormous attention in the energy research community due to their impressive responses both in optical sensing and in photovoltaics. The switching from polycrystalline to monocrystalline morphology, not only allows to maintain the outstanding properties that characterize perovskite materials, but also enhances them. However, the poor control over the thickness and size during growing methods leads to considerable differences between surface and bulk responses. Impedance spectroscopy (IS) has been revealed as a powerful technique to understand the kinetics governing polycrystalline perovskite materials. The ionic migration, trap states, and recombination mechanisms occurring in both bulk and surface of the MHPSCs, need to be analyzed in depth to exploit their full potential. Here, we highlight the importance of IS to further advance our knowledge about monocrystalline perovskite materials, bringing to the table the relevance of other small perturbation techniques to complement the IS.

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confidence: 99%

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

et al. 2021

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“…The experiments were performed at a bias voltage from 0.65 to 0.90 V and an amplitude of 10 mV sinusoidal voltage in the frequency range of 1 Hz to 1 MHz in the dark. The parameters like recombination resistance ( R rec ), capacitance ( C ), and trap density of states (DOS) can be estimated from the EIS data. ,, A semicircle was obtained in the Nyquist plots of PSCs (Figure b), which is related to R rec at the interfaces of perovskite and charge transfer layers (HTL, ETL) as well as over the perovskite film. The R rec values were obtained by fitting the EIS curves using an equivalent circuit (inset of Figure b).…”

Section: Resultsmentioning

confidence: 99%

Additive-Assisted Defect Passivation for Minimization of Open-Circuit Voltage Loss and Improved Perovskite Solar Cell Performance

Afroz

Garai

Gupta

et al. 2021

ACS Appl. Energy Mater.

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Trap state formation in perovskite films during their preparation is a key limitation restricting the device performance and stability of perovskite solar cells. These trap states are generally present at the surface of perovskite films and on grain boundaries and work as charge recombination centers, thereby influencing the device performance. Hence, regulating these detrimental trap states that are susceptible to deformation is vital for improving the solar cell performance. Herein, a unique methodology of trap states passivation has been demonstrated using multiple carboxylic acid-functionalized small aromatic molecules. Three additives, viz., benzene carboxylic acid (BCA), benzene-1,3-dicarboxylic acid (BDCA), and benzene-1,3,5-tricarboxylic acid (BTCA), have been utilized as additives in the precursor solution that reduced trap states in the perovskite films. Perovskite films generated in the presence of these additives strongly influence the charge transfer dynamics and result in improved performance and stability of the devices by lowering the photogenerated charge recombination. BTCA-incorporated devices result in the highest power conversion efficiency (PCE) of 18.30% with a significant improvement in the open-circuit voltage (V oc) to 1075.9 mV (an enhancement of ≈80 mV) compared to the control device. Additionally, the devices also show enhanced thermal stability.

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“…The dyes A10 and A6 were synthesized by the Knoevenagel condensation. All chemical compounds were characterized by 1 H NMR, 13 C NMR spectroscopy, mass spectroscopy, and infrared spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

“…In recent decades, many efforts have been focused on developing photosensitizers with broad absorption characteristics, especially in the near-infrared regions. , One of the promising strategies is to introduce vinyl groups − or alkynyl groups , in the π-spacer segment. Relevant studies have shown that inserting vinyl into the dye is a double-edged sword, which generally brings a certain degree of voltage drop but can effectively improve the photocurrent due to better planarity.…”

Section: Introductionmentioning

confidence: 99%

Effect of Extending the Conjugation of Dye Molecules on the Efficiency and Stability of Dye-Sensitized Solar Cells

Zhou¹,

Lin²,

Chen³

et al. 2021

ACS Omega

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We designed and synthesized two organic dyes (A6 and A10) for dye-sensitized solar cells (DSSCs) by extending the molecular conjugation strategy. The sensitizer A10 was constructed by inserting ethene into our previously reported sensitizer AZ6. The sensitizer A6 was obtained by further substituting the hydrogen of ethene with another donor (D) and π-bridge-acceptor (π–A) segment. The UV–vis spectra and J–V curves showed that the dyes A10 and A6 could effectively facilitate the light-harvesting and photocurrent densities with respect to AZ6. Consequently, the A10-based DSSC achieved an enhanced efficiency (8.54%) with a high photocurrent (18.81 mA cm–2). Desorption experiments of dyes adsorbed on TiO2 showed that compared with the monoanchoring dyes AZ6 and A10, the dianchoring configuration effectively strengthened the affinity of dye A6 with the photoanode, making it more difficult to leach from the photoanode. The A6-based DSSC shows outstanding stability, and its overall efficiency could remain 98.0% of its initial value after 3000 h of aging time, exceeding that of its monoanalogue AZ6 (remained 78.3% after 3000 h).

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Effect of mono- and di-anchoring dyes based on o,m-difluoro substituted phenylene spacer in liquid and solid state dye sensitized solar cells

Cited by 22 publications

References 46 publications

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Impedance Spectroscopy for Metal Halide Perovskite Single Crystals: Recent Advances, Challenges, and Solutions

Additive-Assisted Defect Passivation for Minimization of Open-Circuit Voltage Loss and Improved Perovskite Solar Cell Performance

Effect of Extending the Conjugation of Dye Molecules on the Efficiency and Stability of Dye-Sensitized Solar Cells

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