Sensitizing Dye

Sensitizing Dye

 

(or optical sensitizer, spectral sensitizer). An organic dye that, when adsorbed to the surface of the silver halide crystals of a photographic emulsion, makes the dyed crystals sensitive to light in the green, red, or infrared regions of the spectrum. A nonsensitized silver halide is not sensitive to such light.

Most sensitizing dyes are polymethine dyes. The molecules of the dye typically contain heterocyclic rings and a conjugated polymethine chain:

where n = 0, 1, 2, 3. The chemical nature of the heterocyclic rings and the length of the polymethine chain determine the dye’s region of spectral absorption, the dye’s region of sensitization, and the efficiency of the sensitizing action.

REFERENCE

Kogan, I. M. Khimiia krasitelei, 3rd ed. Moscow, 1956.
References in periodicals archive ?
DSSC is designed based on light harvesting by a sensitizing dye attached to the nanostructured semiconductor [1].
DX is a sensitizing dye for dye sensitized solar cells developed by a team including Hiroshi Segawa Professor of Research Center for Advanced Science and Technology at the University of Tokyo, who is a key researchers in the Cabinet Office's Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST), and is a next-generation sensitizing dye able to efficiently absorb and perform photoelectric conversion of near infrared light(*1) that could not be absorbed by ruthenium sensitizing dyes used in the past.
DX series dyes employ spin inversion excitation (*2) to successfully extend the long-wavelength side of the power generation wavelength range by around 200 nanometers compared to existing sensitizing dyes. As a result, the photocurrent of solar cells is improved by over 25%, and high-performance solar cells using DX series dyes are able to provide the world's highest photocurrent for an organic solar cell at 30mA/cm2 with a high conversion efficiency of over 10.0%.
Firstly, it must be able to transfer holes from the sensitizing dye after the dye has injected electrons into the Ti[O.sub.2].
Photopolymers are made up of a photopolymerization initiator, sensitizing dye and one or more polymerizable monomers in a polymer matrix which acts as a support.
The upper cell consists of a red sensitizing dye that absorbs visible light.
A new sensitizing dye has been used to reduce dye stain and enhance the film's contrast.
Kubo et al., "Performance improvement of solid-state Dye-Sensitized Solar Cells fabricated using poly(3,4-ethylenedioxythiophene) and amphiphilic sensitizing dye," Journal of the Electrochemical Society, vol.
Gregg, "pH-dependent redox potential induced in a sensitizing dye by adsorption onto Ti[O.sub.2]" Journal of Physical Chemistry B, vol.
One typical sensitizing dye is the ruthenium complex di-tetrabutylammonium cis-bis(isothiocyanato)bis(2,2,-bipyridyl-4,4,-dicarboxylato)ruthenium(II), known as N719, which assists in realizing high photoelectric conversion efficiency [19, 20].
Besides the electrolyte and semiconductor, the performance of DSSCs is vitally influenced by the structural engineering of the sensitizing dyes, which absorb sunlight to generate electrons and transmit generated electrons [10-15].
It was confirmed that the reason of the deterioration of photoenergy-conversion efficiency against thermal stress is desorption of the sensitizing dyes from the surface of Ti[O.sub.2] electrode into the electrolyte [12, 29, 30].