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Molecular geometry, synthesis and photovoltaic performance studies over 2-cyanoacetanilides as sensitizers and effective co-sensitizers for DSSCs loaded with HD-2
摘要： The design, synthesis and photovoltaic performance of metal-free 2-cyanoacetanilide based organic dyes, SA1-6 have been reported as sensitizers / co-sensitizers in dye sensitized solar cells (DSSCs). All dyes possess the thermodynamic requirements to be applied in DSSCs. The DFT and TD-DFT calculations were completed using Guassian09 package software. The obtained results showed appropriate charge separation between the ground state oxidation potential (GSOP) and excited state oxidation potential (ESOP) levels of the dyes. In addition, there was a good agreement between the theoretical and experimental data. Among the dyes, SA1-6, the co-sensitizer SA1 displayed the highest PCE of 8.02% with increasing in both (VOC) (0.0.682) and JSC (20.33 mA / cm2) which attributed to the smallest size of the dye facilizing largest surface area of TiO2 to be covered by the dye. Electrochemical impedance spectroscopy measurements, beside electron lifetimes of SA1-6 and HD-2 were obtained and are in good agreements with the experimental photovoltaic parameters.
关键词： 2-Cyanoacetanilide,DFT,anchoring group,Dye sensitized solar cells (DSSCs)
更新于2025-09-12 10:27:22
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w-ZnO nanostructures with distinct morphologies: Properties and integration into dye sensitized solar cells
摘要： Herein, we report the cost-e?ective and single-step reaction strategies for the synthesis of distinct morphology of ZnO namely, nanoparticles, nanotubes and nanowires involving co-precipitation and hydrothermal methods. Powder X-Ray di?raction analysis indexed nine distinct peaks which correspond to the w-ZnO for all the synthesized nanostructures. The formation mechanism of nanostructures are proposed, in which the role of surfactants (polyvinylpyrrolidone and sodium dodecyl sulfate) and the oriented self-assembly are taken into account. The Raman spectral analysis of the nanostructures con?rms the presence of highly intense E2 high phonon vibrational modes corresponding to the movement of O-atoms and Zn sub-lattices of w-ZnO respectively. The prepared yellowish ZnO nanowires reveal intensi?cation in optical absorption and shrinkage in band gap due to increased oxygen vacancies in the sample. The quenching of green luminescence in the photo-luminescence spectrum of the nanowire further con?rms the oxygen vacancies. All the nanostructures were integrated into dye sensitized solar cells as photoanode materials. The photovoltaic parameters and electrochemical charge transfer properties of the fabricated dye sensitized solar cells (DSSCs) were evaluated by using photocurrent density-photovoltage curves and Nyquist plots of electrochemical impedance spectroscopic (EIS) studies. Due to the presence of large pore size in nanowires and nanotubes, the dye in?ltration and electrolyte di?usion rates are high and cause the highest photocurrent densities of 1.714 mA cm?2 and 1.813 mA cm?2 respectively. The speci?c hollow tube like nanostructures is channelizing the photo-injected electrons directly to the collector electrode and results in high photovoltaic conversion e?ciency of 1.109%. High value of charge transfer resistance across the ZnO/dye/electrolyte interfaces in nanocapsule and nanoparticle based DSSCs enforce low conversion e?ciency to the devices.
关键词： Growth mechanism,Band gap narrowing,Dye sensitized solar cells,Zinc oxide
更新于2025-09-12 10:27:22
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Broadband Plasmonic Enhancement of High-Efficiency Dye-Sensitized Solar Cells by Incorporating Au@Ag@SiO <sub/>2</sub> Core–Shell Nanocuboids
摘要： The introduction of plasmonic additives is a promising approach to boost the efficiency of dye-sensitized solar cell (DSSC) since it may improve the light harvesting of a solar cell. Herein, we design broadband and strong plasmonic absorption Au@Ag@SiO2 nanocuboids (GSS NCs) as nanophotonic inclusions to achieve plasmon-enhanced DSSCs. These multiple resonances absorption arising from GSS NCs can be readily adjusted by altering their structures to complementarily match the absorption spectrum of the dyes, especially in weak absorption zones. By subtly regulating the position of nanophotonic inclusions in the photoanodes, not only the plasmonic near-field enhancement but also far-field light-scattering could be adequately developed to promote the light harvest and thus the efficiency of DSSCs. The resulting solar cells yield an average efficiency of 10.34%, with a champion value of 10.58%. The electromagnetic simulations are consistent with the experimental observations, further corroborating the synergistic effect of plasmonics improvement in these DSSCs.
关键词： near-field effect,light-scattering,light management,plasmon resonance,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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An efficient and thermally stable dye-sensitized solar cell based on a lamellar nanostructured thiolate/disulfide liquid crystal electrolyte and carbon/PEDOT composite nanoparticle electrode
摘要： A thiolate/disulfide redox based lamellar nanostructured smectic liquid crystal electrolyte with an optimized configuration and a carbon/PEDOT composite nanoparticle electrode were prepared for efficient dye-sensitized solar cells (DSSCs). The configuration of the optimized electrolyte consisted of 1-dodecyl-3-methyl-1H-imidazol-3-ium 1-methyl-1H-tetrazole-5thiolate/di-5-(1-methyltetrazole) disulfide/TBP/LiClO4 in the molecular ratio of 2 : 1 : 1 : 0.1. The carbon/PEDOT composite electrode was developed by electrochemical deposition of PEDOT on a carbon nanoparticle electrode. The additives in the lamellar nanostructured electrolyte were revealed to lower the viscosity of the electrolyte for promoted ion diffusion, as well as benefit the charge transfer process in the DSSC. The carbon/PEDOT nanoparticle electrode was suggested to provide improved catalytic activity and large surface area to favor the charge transfer at the cathode/electrolyte interface of the DSSC. As a result, the DSSC fabricated using the optimized smectic electrolyte, the composite nanoparticle electrode, together with a Z907 sensitized photoanode, attained a maximum power conversion efficiency of 6.5% at 40 °C and stable efficiencies higher than 6.0% within a temperature range from 35 to 55 °C. These results show potential of the optimized smectic thiolate/disulfide electrolyte based DSSCs operating efficiently and stably under outdoor conditions.
关键词： thiolate/disulfide,carbon/PEDOT composite,thermal stability,dye-sensitized solar cells,liquid crystal electrolyte
更新于2025-09-12 10:27:22
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High efficiency dye-sensitized solar cells with <i>V</i> <sub/>OC</sub> – <i>J</i> <sub/>SC</sub> trade off eradication by interfacial engineering of the photoanode|electrolyte interface
摘要： Interfacial modification of the photoanode|electrolyte interface using oleic acid (OA) is thoroughly investigated in this present study. The overall photoconversion efficiency of 11.8% was achieved under the illumination of 100 mW cm?2 with an optical filter of AM 1.5 G. OA molecules were meant to be adsorbed on to the vacant areas of the TiO2 and the OA moieties leached out the aggregated C106 dye molecules from the TiO2 surface. There was a strong spectral overlap between the absorption spectrum of donor (OA) and the emission spectrum of acceptor (C106), leading to effective F?rster Resonance Energy Transfer (FRET) between OA and C106 and suggested an excellent opportunity to improve the photovoltaic performances of DSSCs. UV-vis DRS and UPS analysis revealed that OA molecules created new surface (mid-gap energy) states (SS) in TiO2 and these SS played a major role in the electron transport kinetics. Mott–Schottky analysis of DSSCs under dark conditions was carried out to find the shift in the flat band potential of TiO2 upon OA modification. Surprisingly, no trade off between VOC and JSC was observed after interfacial modification with OA. The dynamics of charge recombination and electron transport at the photoanode|electrolyte interface were studied in detail using electrochemical impedance spectroscopy.
关键词： interfacial engineering,F?rster Resonance Energy Transfer,oleic acid,photoconversion efficiency,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing RECENT TRENDS IN PURE AND APPLIED MATHEMATICS - Vellore, India (13–15 December 2018)] RECENT TRENDS IN PURE AND APPLIED MATHEMATICS - Non-linear optical properties of carbazole based dyes modified with diverse spacer units for dye-sensitized solar cells: A first principle study
摘要： Density functional theory (DFT) and time dependent density functional theory (TDDFT) calculations were performed for evaluating the photophysical and photochemical properties of a sequence of carbazole based metal-free organic dyes modified using different π-conjugation spacer units, such as thiopine, pyrrole, furan, thiazole and isoxazole. Moreover, the modified dyes were subjected to investigation towards their non-linear optical (NLO) features. The results revealed that dipole moment (μ), static polarizability (α), anisotropic polarizability (?α) and hyperpolarizability (first order (β) and second order (γ)) of modified dyes are considerably enhanced as a consequence of changing the spacer unit. Likewise, light harvesting efficiency and oscillator strength of the modified dyes are enhanced upon wavelength of absorption is red-shifted by influence of spacer moieties. We believe that our calculations provide a more profound physical perception on structural property relationship for carbazole based dyes and give a hint to create potential sensitizers for opto-electronic and dye-sensitized solar cell applications.
关键词： dyes,DFT,carbazole,TDDFT,non-linear optical properties,dye-sensitized solar cells
更新于2025-09-12 10:27:22
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Apparatus-dependent sol-gel synthesis of TiO <sub/>2</sub> nanoparticles for dye-sensitized solar cells
摘要： Synthesis of titanium dioxide nanoparticles (TiO2 NPs) has been done by sol-gel-hydrothermal colloidal route in two different apparatus; one being simple stainless steel (named as TiO2-B) and other being at constant temperature and pressure autoclave (named as TiO2-W). These TiO2 NPs were investigated by various characterization techniques such as scanning electron microscope (SEM), X-ray diffractometer (XRD), and photoluminescence spectrophotometer. Also, it was observed that the quality of the synthesized TiO2-W NPs is comparable with the commercial TiO2 NPs (TiO2-C), whereas the cost of synthesis is almost reduced to half. The synthesized TiO2 NPs are used as the photoanode in dye-sensitized solar cell (DSSC). DSSC with TiO2-W showed better power conversion efficiency as compared to DSSC with TiO2-B.
关键词： sol-gel,nanoparticles,dye-sensitized solar cells,TiO2
更新于2025-09-12 10:27:22
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Fabrication and performance of dye sensitized solar cell based on spin coated ZnS nanoparticles
摘要： ZnSx nanoparticles (NPs) with different ratios of sulfur, x = 0.5, 1 and 2, were prepared by solvothermal technique. The structural analyses, based on XRD and FTIR, show that for sulfur content x = 0.5 two phases were formed ZnS and ZnO NPs with cubic and hexagonal structure, respectively. While for sulfur content x = 1 and 2 only ZnS NPs with cubic structure was observed. The crystallites size was study before and after annealing at 500 °C. SEM images show that the prepared samples have nanocrystalline nature. Absorbance spectrum was used to calculate the optical band gap of the powder samples dispersed in potassium hydroxide solution. All samples have direct optical band gap which was inversely proportional to the sulfur content. ZnS NPs were irradiated by different doses of γ-rays and the effect on optical band gap was studied. The resulting from solvothermal preparation technique was served as precursor solution to deposit ZnSx layers onto the fluorine-doped tin oxide coated glass substrates by spinning process. The deposited ZnS NPs layers were successfully used as photoelectrode materials in dye-sensitized solar cells and the I–V characteristics were measured under illumination and in dark. An improvement in the efficiency was observed after annealing the ZnSx layers, x = 0.5 and 1, photoelectrode materials.
关键词： Dye-sensitized solar cells,Solvothermal technique,ZnS nanoparticles,γ-irradiation,Optical band gap
更新于2025-09-12 10:27:22
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Photo-driven water splitting photoelectrochemical cells by tandem organic dye sensitized solar cells with I?/I3? as redox mediator
摘要： Dye-sensitized photoelectrochemical tandem cells have shown the promise for light driven hydrogen production from water owing to the low cost, wide absorption spectra in the visible region and ease to process of their constitutive photoelectrode materials. However, most photo-driven water splitting photoelectrochemical cells driven by organic dye sensitized solar cells exhibit unsatisfactory hydrogen evolution rate, primarily attributed to their poor light capturing ability and low photocurrent performance. Here we present the construction of a tandem system consisting of an organic blue-colored S5 sensitizer-based dye-sensitized photoelectrochemical cell (DSPEC) wired in series with three spectral-complemental dyes BTA-2, APP-3 and APP-1 sensitizers-based dye-sensitized solar cell (DSC), respectively. The two spectral-complemental chromophores were used in DSC and DSPEC to ensure that the full solar spectrum could be absorbed as much as possible. The results showed that the photocurrent of tandem device was closely related to the open-circuit voltage (Voc) of sensitized DSC, in which the tandem configuration consisting of S5 based DSPEC and BTA-2 based DSC gave the best photocurrent. On this basis, tandem device with the only light energy and no external applied electrical bias was further constructed of BTA-2 based 2-junction DSC and S5 based DSPEC and obtained a photocurrent of 500 μA cm?2 for hydrogen generation. Furthermore, I?/I3 ? was used as a redox couple between dye regeneration and O2 production on the surface of Pt-IrO2/WO3. The strategy opens up the application of pure organic dyes in DSC/DSPEC tandem device.
关键词： dye-sensitized photoelectrochemical cells,water splitting,tandem device,dye-sensitized solar cells
更新于2025-09-11 14:15:04
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Carboxylic Acid Functionalization at the Meso-Position of the Bodipy Core and Its Influence on Photovoltaic Performance
摘要： Two bodipy dyes with di?erent carboxylic acids on the meso-position of the bodipy core were prepared and used to sensitize TiO2 photoelectrodes. On the basis of spectroscopic characterization, the photoelectrodes were used to fabricate photoelectrochemical cells (PECs) for solar light harvesting. Photovoltaic measurements showed that both bodipy dyes successfully sensitized PECs with short-circuit current densities (JSC) two-fold higher compared to the control. The increase in generated current was attributed to the gain in spectral absorbance due to the presence of bodipy. Finally, the in?uence of co-sensitization of bodipy and N719 dye was also investigated and photovoltaic device performance discussed.
关键词： Dye-sensitized solar cells,photoelectrochemical cells,N719 dye,co-sensitization,bodipy dye
更新于2025-09-11 14:15:04