The most commonly used material system for PSCs consists of conjugated polymers as the
electron donor and fullerene derivatives as the electron acceptor materials, blended in a bulk heterojunction (BHJ) to overcome the strong excitonic behavior of photogenerated charge carriers.
The absorption wavelengths arising from S0[right arrow]S1 electronic transition increase progressively with the increasing of the
electron donor strength substituents and with the decreasing of the band gap energies of the studied molecules.
Caption: Figure 2: The absorption spectra of bacteriochlorophyll-a in organic solvent ([[lambda].sub.max] = 770 nm, ET-OH), bound to the RC in the form of monomer (called "accessory chlorophylls," [[lambda].sub.max] = 802 nm) and in the form of dimer (called primary
electron donor, [(BChl).sub.2], [[lambda].sub.max] = 860 nm).
UV-Vis data indicate the poor cross- conjugation in these systems due to the push-pull intra molecular charge transfer (CIT) sequence from
electron donor to acceptor group.
To sustain the reductive dechlorination process, a source of reducing equivalents (i.e., an
electron donor) must be provided.
This coplanar molecular structure would improve the electron transfer from the
electron donor to the electron acceptor through the squaric ring unit for these dyes.
Keeping this in view, we have designed three new D-A type conjugated polymers carrying 1,3,4-oxadiazole as an electron acceptor moiety and thiophenes with different substitution as
electron donors in the polymer backbone with the hope that resulting molecules would show better NLO properties.
MFCs can prove to be a sustainable core technology adaptable to a wide variety of applications converting a wide array of
electron donors with effective energy generation at low and moderate temperatures, even when the
electron donor is provided at low concentrations [79].
The NBO results suggest that there are some charges transferred from the
electron donor (phenothiazine group) to the electron acceptor (cyanoacrylic acid) through the chemical bonds of the conjugate 3,4-ethylenedioxythiophene bridge.
Complete biodegradation of these compounds at contaminated sites is often limited by the availability of a suitable
electron donor (He et al.
However, when fenthion sulfoxide was incubated with liver cytosol in the presence of 2-hydroxypyrimidine, an
electron donor of aldehyde oxidase, the extract of the incubation mixture exhibited antiandrogenic activity.