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 .
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.