Effect Of Organic Dyes Research Articles

Effect of organic dyes and polypyrrole on the efficiency of dye-sensitized solar cells

Polypyrrole films were coated on conductive glass by electrochemical deposition (alternative current of direct process). They were then used as the dye-synthesized solar cell counter electron electrodes. Scanning electron microscopy revealed that polypyrrole forms a nanoparticle like structure on the conductive glass. In the present study, two new organic dyes based on aniline and substituted 5-Nitrosalicylaldehyde with aniline were prepared and used and sensitizes in dye-sensitized solar cells. These dyes in solution and on a nano-anatase v2o5 substrate were investigated. Additionally, oxidation potential measurement were also carried out. Finally, dye-sensitized solar cells were fabricated to determine and conversion efficiency of each dye.

Effect of organic dyes on structural properties, linear optics and impedance spectroscopy of methyl orange (C.I. acid orange 52) doped polyvinyl alcohol composite thin films

The effect of methyl orange (MEO) dye on structural properties, linear optics and impedance spectroscopy of the polymer poly(vinyl alcohol) (PVA) is studied. MEO/PVA composite thin film was prepared via casting technique. The changes in the structures of the samples were characterized by XRD, which revealed that the internal strain improved the growth of the crystal imperfection and distortion with increasing MEO content in the composite samples. The UV–Vis–NIR spectroscopy was used to study the effect of MEO organic on the optical properties of composite thin films. The samples enhanced more potent light UV–Visible absorption and have very effective prohibition UV-light effect even with incorporating MEO content in the range between 190 and 535 nm. The gap energy leads to a decrease in the visible region which could be attributed to the decrease in crystallite sizes with increasing MEO content. Normalized power characteristics of the films at various MEO concentrations were studied. The normalized power is the very interesting behavior to correlate the optical UV–Vis transmittance and the optics limiting effect of the samples. The dependence of frequency on the conductivity has analyzed in phases of an empirical Jonscher’s law. The impedance spectra were analyzed in terms of equivalent circuits involving resistors, capacitors and constant phase elements. Dielectric parameters infer that the incorporating MEO organic dye inside the PVA matrix may be affected by the faster charge transfer properties and behave like a non-ideal capacitor.

Effect of organic dye on the performance of dye-sensitized solar cell utilizing TiO2 nanostructure films synthesized via CTAB-assisted liquid phase deposition technique

This work is concerned with the growth of TiO2 nanostructures as photovoltaic materials of dyesensitized solar cell (DSSC) via phase liquid deposition technique treated with CTAB surfactant. This work investigates the influence of organic dyes, N719, N3 and Z907 as photosensitizer on the photovoltaic parameters of TiO2 nanostructures dye-sensitized solar cells (DSSCs). It also highlights the effect of the concentration of the best dye, N719 on the performance of the cell. The platinum films as counter electrode of the DSSC were prepared by sputtering platinum pellet on ITO substrate. The redox couple of the electrolyte utilized in the DSSC was iodide/triiodide. The cell sensitized with N719 dye demonstrated the best performance compared with the cell sensitized with another two dyes, N3 and Z907. This is due to N719 dye possess the highest optical absorption in visible region. The cell sensitized with 0.8 mM N719 dye performs the highest short-circuit current density, Jsc and power conversion efficiency, η since it posses the highest absorption in visible region. The DSSC utilizing 0.8 mM N719 dye demonstrated the highest Jsc and η of 6.48 mA cm−2 and 1.69%, respectively.

Effect of Organic Dye on the Photovoltaic Performance of Dye-Sensitized ZnO Solar Cell

This work investigated the influence of the organic dyes Orange IV and Eosin Y as photosensitizers on the photovoltaic parameters of ZnO photoelectrode dye-sensitized solar cells (DSSCs). ZnO was prepared by homemade ZnO nanoparticles. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and BET measurements were used to characterize the structures and the morphology of ZnO nanostructures. The Orange IV demonstrated the best performance compared with the cell sensitized with the Eosin Y. This occurred as Orange IV demonstrated the highest molar extinction coefficient.

Effect of organic dyes on the performance of ZnO based dye-sensitized solar cells

The present paper reports the synthesis and performance study of ZnO based Dye-sensitized solar cells (DSSC). ZnO nanorods were fabricated by sol-gel technique using. Three types of DSSCs were fabricated by two different classes of organic dyes using, namely xanthenes, anthocyanins and a mixed-dye with equal proportion mixture of xanthenes and anthocyanins. The absorbance spectra of dyes were compared with performances of the cells. The parasitic resistances of the cells were determined from the I–V characteristics of the cells and various parameters of DSSCs like Ideality factor, Fill factor and Energy conversion efficiency were determined. Among the three kinds of dyes tested, the efficiency of cell with mixed dye was intermediate but its value was found to be higher than the average efficiency of cells with two individual dyes. This is due to the improvement in ideality factor of the cell.

Effect of organic dye, the concentration and dipping time of the organic dye N719 on the photovoltaic performance of dye-sensitized ZnO solar cell prepared by ammonia-assisted hydrolysis technique

This work investigated the influence of the organic dyes N719, N3 and Z907 as photosensitizers on the photovoltaic parameters of ZnO nanorod dye-sensitized solar cells (DSSCs). It also evaluated the effect of the concentration and dipping time of the best dye, N719, on the performance of the cell. TiO2 nanorods, used as the photovoltaic material of the cell, were prepared via an ammonia-assisted hydrolysis technique. The platinum film as the counterelectrode of the DSSC was prepared using a platinum pellet on an ITO substrate. The redox couple of the electrolyte utilized in the DSSC was iodide/triiodide. The cells sensitized with the N719 and Z907 dyes demonstrated the best performance compared with the cell sensitized with the N3 dye. This occurred as N719 and Z907 demonstrated the highest optical absorption in the visible region. The cell sensitized with a dipping time of 6h in 0.3mM N719 performed with the highest short-circuit density, Jsc, of 1.07mAcm−2 and conversion efficiency, η, of 0.135% since it possessed the highest optical absorption in the visible region. The corresponding incident photon-to-current conversion efficiency (IPCE) of the cell was 41.0%.

Effect of organic dye on copper metallization of high aspect ratio through hole for interconnect application

Copper metallization of various aspect ratio through hole were performed by bath modification using methylene blue, an organic dye as leveler. Methylene blue (MB) which is a heterocyclic compound was added in different concentration in a three component additive system. Copper deposition inside the through hole was modified with concentration of leveler additive. High concentration of MB in the plating bath leads to greater suppressing effect, whereas at low concentration uniform filling inside the holes and on the board surface was observed. The synergetic effect of different additives during plating was destroyed at high concentration of leveler as revealed from impedance and cyclic voltammetric analysis. The greater interaction of leveler additive to the cathode that disrupt the dynamic nature of adsorption–desorption process, was found to have deleterious effect on super filling as revealed from optical micrograph analysis. There occur void formation inside the through holes at high leveler concentration and has more inhibiting nature as revealed from various analyses. Crystal orientation of the plated films with respect to additive modification was characterized by X-ray diffraction (XRD) analysis.

Organic Microbiological Studies: Effects of Organic Dyes(GentianViolet or Methylene Blue)On Laser Lethal photosensitization of Fungus Aspergillus flavus Treated with Boric Acid

Organic Microbiological Studies: Effects of Organic Dyes(GentianViolet or Methylene Blue)On Laser Lethal photosensitization of Fungus Aspergillus flavus Treated with Boric Acid

Effect of organic dyes on the dielectric properties of KH2PO4 crystals

The effect of organic dyes on the dielectric properties of KH2PO4 (KDP) crystals is studied over a wide range of temperatures. The dielectric properties of KDP crystals doped with molecules of the Chicago Sky Blue and Amaranth organic dyes are investigated for the first time. The dye molecules can be incorporated into the crystal lattice of KDP and selectively paint the pyramidal growth sectors of the crystal. The influence of dye organic impurities on the domain contribution to the permittivity is analyzed with due regard for the sectoral crystal structure. It is demonstrated that, upon doping of KDP crystals with organic dyes, the blocking effect of background impurities on domain walls is substantially weakened in the prismatic growth sector of the crystal in the polar phase. This leads to a noticeable change in the dielectric properties, specifically to an increase in the domain contribution to the permittivity of the crystal.

Solar concentrators using total internal reflection

A study is presented of solar concentrators based on total internal reflections. The concentrators are placed over photovoltaic cells. Experimental data obtained with different encapsulating materials and dependence on geometrical and physical variables are given. A theoretical model which includes the losses in the encapsulating material is proposed, giving good agreement with the experimental data. Gain factors as high as 30% have been obtained with these concentrators. The additional effect of organic dyes on absorption bands in the 350–360-nm range is also studied.

Optical Design Considerations in Photobleaching with cw Lasers

A new method is described which uses the stabilized output radiation of a cw laser as an exciting light source to study reversible and irreversible nonlinear absorption effects of organic dyes in aqueous solutions at high laser power densities. Design concepts which emerged from a closer study of the laser beam properties and its interaction with liquids are discussed. It is felt that this method is applicable not only for photolytic studies, but also in spectroscopic, spectrophotometric, and other experiments with cw lasers.