Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 26, 2024
Abstract
Chiral
organic
small
molecules
are
promising
for
circularly
polarized
light
(CPL)
detection
due
to
their
easy
modifiability,
strong
intermolecular
interactions,
and
straightforward
manipulation
of
the
transition
dipole
moments.
However,
they
often
exhibit
a
low
absorption
asymmetry
factor
(
g
abs
)
since
magnetic
moment
m
is
overshadowed
by
electric
μ
),
alignment
θ
not
optimized,
limiting
performance
CPL
photodetectors.
This
study
introduces
an
ortho
‐substitution
strategy
significantly
enhance
in
chiral
perylene
diimides
(PDIs)
tuning
crystal
packing
motif.
Incorporating
cyano
group
at
ortho‐position
markedly
reduces
angle
between
within
crystal,
thus
amplifying
.
The
fabricated
single‐crystal
film
devices
R
)‐4CN‐PDI‐Ph
demonstrated
superior
photodetecting
performance,
with
photocurrent
ph
0.362
—
three
times
larger
than
that
its
counterpart
)‐4PH‐PDI‐Ph.
These
findings
underscore
pivotal
role
molecular
stacking,
enhancing
detection,
deepening
understanding
structure‐performance
relationship
optoelectronics.
Macromolecular Rapid Communications,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 3, 2024
Abstract
Branch‐connected
dimerized
acceptors
can
take
full
advantages
of
four
end
units
in
enhancing
molecular
packing
comparing
to
that
terminal‐connected
ones,
thus
potentially
reaching
the
best
balance
between
stability
and
power
conversion
efficiency
(PCE)
organic
solar
cells
(OSCs).
Herein,
two
branch‐connected
acceptors,
namely
D1
D2,
are
developed
by
employing
bithiophene
difluorinated
as
linker
groups,
respectively.
Induced
fluorine
atoms
on
group,
D2
affords
a
larger
molar
extinction
coefficient,
more
importantly,
optimized
nanoscale
film
morphology
superior
charge
transport
behavior
D1.
Consequently,
D2‐based
binary
OSCs
render
good
PCE
16.66%,
outperforming
15.08%
for
D1‐based
ones.
This
work
highlights
great
significance
group
screening
designing
high‐performance
acceptors.
In
this
work,
three
alkoxy-substituted
quinoxaline
core-based
small-molecule
acceptors
(BQO-F,
BQDO-F,
and
BQDO-Cl)
are
developed
to
elucidate
the
impact
of
ethoxy
substituents
on
physicochemical
photoelectric
properties.
Comparative
analysis
reveals
that
dialkoxy-substituted
BQDO-F
has
a
more
planar
molecular
skeleton,
red-shifted
absorption
spectrum,
upshifted
energy
levels,
stronger
crystallinity,
reduced
energetic
disorder
compared
monoalkoxy-substituted
BQO-F.
Although
replacement
fluorine
atoms
with
chlorine
end-capped
units
leads
bathochromically
shifted
resulting
molecule
BQDO-Cl
shows
worse
π-π
packing
order
BQDO-F.
Benefiting
from
favorable
active
layer
morphology
improved
carrier
dynamics,
PBDB-T:BQDO-F-based
organic
solar
cell
achieves
much
higher
power
conversion
efficiency
(PCE)
16.41%
14.48%
obtained
in
BQO-F-based
device.
comparison
BQDO-F-based
device,
voltage
loss
BQDO-Cl-based
device
results
lower
PCE
15.89%.
The
clarify
effects
substitutions
efficient
cells.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 26, 2024
Abstract
Chiral
organic
small
molecules
are
promising
for
circularly
polarized
light
(CPL)
detection
due
to
their
easy
modifiability,
strong
intermolecular
interactions,
and
straightforward
manipulation
of
the
transition
dipole
moments.
However,
they
often
exhibit
a
low
absorption
asymmetry
factor
(
g
abs
)
since
magnetic
moment
m
is
overshadowed
by
electric
μ
),
alignment
θ
not
optimized,
limiting
performance
CPL
photodetectors.
This
study
introduces
an
ortho
‐substitution
strategy
significantly
enhance
in
chiral
perylene
diimides
(PDIs)
tuning
crystal
packing
motif.
Incorporating
cyano
group
at
ortho‐position
markedly
reduces
angle
between
within
crystal,
thus
amplifying
.
The
fabricated
single‐crystal
film
devices
R
)‐4CN‐PDI‐Ph
demonstrated
superior
photodetecting
performance,
with
photocurrent
ph
0.362
—
three
times
larger
than
that
its
counterpart
)‐4PH‐PDI‐Ph.
These
findings
underscore
pivotal
role
molecular
stacking,
enhancing
detection,
deepening
understanding
structure‐performance
relationship
optoelectronics.
