Relationships Of Dyes Research Articles

Review effect of various types of dyes and structures in supporting performance of dye‐sensitized solar cell TiO 2 ‐based nanocomposites

The energy demand for supporting the activity of human life is increasing where fossil fuels decreasing sharply every year and have an impact on increasing CO2 emissions in the environment. An alternative solution for providing practical energy needs is using renewable energy such as solar cells. For environmentally friendly, economical, and efficient concepts, dye-sensitized solar cell (DSSC) is a promising alternative for the photovoltaic field. The performance of a DSSC depends on many factors, such as electron collection at the photoanode, photoanode light-harvesting efficiency, and others. In this review article, we observe the influence of synthetic and natural dye materials on light-harvesting efficiency at photoanodes. The chemical structure of dyes plays an essential role in increasing photon absorption, thereby increasing electron injection and conversion efficiency. In addition to dyes, we also reviewed the influence of the shape of the DSSC structure, namely the sandwich, monolithic, and honeycomb structures, on the performance of DSSCs. This approach helps develop a narrative about the potential and relationship of dyes and structure in increasing efficiency as a guide for synthesizing new materials in the future.

Theoretical study on the structure–property relationship of D–A–π–A-type dye-sensitized solar cells: π-bridge and the side alkyl chain

Two series of dyes have been designed and theoretically characterized through density functional theory and time-dependent density functional theory to systematically explore the structure–property relationship of dyes with D–A–π–A architecture and the performance of dye-sensitized solar cells, particularly the influence of the π-bridge, including its alkyl side chain, adding additional conjugate spacer, displacement, and separation of π-bridge. Key parameters associated with the short-circuit current density Jsc and open-circuit photovoltage Voc were characterized and analyzed in detail. All of the analysis results manifest that dye H1 should be the best candidate to fabricate dye-sensitized solar cells owing to the best optical absorption property (a broad absorption band from 300 to 900 nm for adsorbed dye) and other outstanding parameters.

Red-edge laser action from borondipyrromethene dyes

Long-wavelength fluorescent dyes with improved efficiency and stability are required to realize new photoelectronic and biophotonic applications. We have designed and synthesized novel 2,6- or 3,5-substituted BODIPY (BDP) dyes by a simple protocol to reach wavelength-finely tunable laser action from 600 to 725 nm. The influence of the nature and position of substituents on the laser behavior of the new BDP dyes have been systematically characterized as a function of dye concentration and chemical character of the medium. Regarding efficiency and photostability, the new chromophores outperform the laser action of dyes presently commercialized and considered as benchmarks over this spectral region when pumped under identical conditions. The results obtained provide insight into the always complicated composition-structure-properties relationship of dyes, and suggest possible synthesis routes for new BDP derivatives with properties optimized for specific applications.

Structure/Function Relationships in Dyes for Solar Energy Conversion: A Two-Atom Change in Dye Structure and the Mechanism for Its Effect on Cell Voltage

Recombination between injected electrons and iodine limits the photovoltage in dye-sensitized solar cells (DSSCs). We have recently suggested that many new dye molecules, intended to improve DSSCs, can accelerate this reaction, negating the expected improvement (J. Am. Chem. Soc. 2008, 130, 2907). Here we study two dyes with only a two-atom change in the structure, yet which give different V(oc)s. Using a range of measurements we show conclusively that the change in V(oc) is due solely to the increase in the recombination rate. From the structure of the dyes, and literature values for iodine binding of similar compounds, we find that it is very likely that the change in V(oc) is due solely to the difference in iodine binding at the site of the two-atom change. Using the large amount of literature on iodine complexation, we suggest structures for dyes that might show improved V(oc).

Developments in the Application of Quantitative Structure‐Property Relationships of Dyes

Presented at the 13th Congress of the International Federation of Associations of Textile Chemists and Colourists in London on 20 September 1984.A major aim of current research in dye chemistry is the detection of quantitative relationships between structure and technical properties in order to design new compounds. In the study reported here the light fastness of a set of azo dyes was analysed by some of the methods of chemometrics.