ACS Materials Letters,
Journal Year:
2024,
Volume and Issue:
6(10), P. 4472 - 4481
Published: Aug. 29, 2024
Acceptor–donor–acceptor
(A-D-A)
structured
π-conjugated
molecules
emerge
as
a
new
class
of
phototheranostic
materials.
The
π-bridge
has
rarely
been
investigated
for
structure
engineering
compared
with
the
D
and
A
units.
This
work
reveals
that
changing
ethylene
into
butadiene
can
efficiently
extend
absorption
wavelength
promote
nonradiative
transition.
Specifically,
not
only
extends
π-conjugation
length
but
also
disrupts
S···O
interlocking,
which
facilitates
intramolecular
torsions
rotations
enhances
charge
transfer
molecule
π-bridge.
As
result,
very
broad
70
nm
red-shift
is
observed,
power
conversion
efficiency
(PCE)
BTVIC
nanoparticles
reaches
82.6%.
Ultimately,
photoacoustic
imaging
(PAI)-guided
photothermal
therapy
(PTT)
applications
in
vivo
demonstrate
deep
penetration
depth
over
7
mm
an
efficient
anti-tumor
effect.
illustrates
modifying
practical
strategy
regulating
A-D-A
interactions
developing
more
agents.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(41)
Published: Aug. 13, 2024
Abstract
High‐performance
organic
solar
cells
often
rely
on
halogen‐containing
solvents,
which
restrict
the
photovoltaic
industry.
Therefore,
it
is
imperative
to
develop
efficient
materials
compatible
with
halogen‐free
solvents.
Herein,
a
series
of
benzo[
]phenazine
(BP)‐core‐based
small‐molecule
acceptors
(SMAs)
achieved
through
an
isomerization
chlorination
strategy
presented,
comprising
unchlorinated
NA1,
10‐chlorine
substituted
NA2,
8‐chlorine
NA3,
and
7‐chlorine
NA4.
Theoretical
simulations
highlight
NA3's
superior
orbit
overlap
length
tight
molecular
packing,
attributed
interactions
between
end
group
BP
unit.
Furthermore,
NA3
demonstrates
dense
3D
network
structures
record
electronic
coupling
104.5
meV.
These
characteristics
empower
ortho‐xylene
(
o
‐XY)
processed
PM6:NA3
device
power
conversion
efficiency
(PCE)
18.94%,
surpassing
PM6:NA1
(15.34%),
PM6:NA2
(7.18%),
PM6:NA4
(16.02%).
Notably,
significantly
lower
PCE
in
excessive
self‐aggregation
NA2
‐XY.
Importantly,
incorporation
D18‐Cl
into
binary
blend
enhances
crystallographic
ordering
increases
exciton
diffusion
donor
phase,
resulting
ternary
19.75%
(certified
as
19.39%).
findings
underscore
significance
incorporating
new
electron‐deficient
units
design
SMAs
tailored
for
environmentally
benign
solvent
processing
OSCs.
Advanced Energy Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
This
study
focuses
on
the
synthesis
and
performance
of
non‐fullerene
acceptors
(NFAs)
with
varying
chlorine
dispersion
in
organic
solar
cells
(OSCs).
Four
chlorine‐mediated
acceptors,
BO3Cl‐
a
,
γ
β
BOEH3Cl‐
are
synthesized
isomeric
terminal
groups
then
integrated
donor
PBDB‐TF
to
fabricate
OSCs.
It
finds
that
increased
improves
device
efficiency
enhanced
current
‐based
devices
achieving
power
conversion
(PCE)
over
19%,
which
is
one
highest
values
reported
for
asymmetrically
chlorinated
acceptors.
In
OSC
devices,
Enhanced
exciton
dissociation
reduced
carrier
recombination
observed
more
dispersion,
along
improved
charge
transport
due
modulation
molecular
packing
active
layer.
Furthermore,
transient
absorption
spectroscopy
elucidates
augments
diffusion
time,
thereby
elevating
density
while
branching
strategy
further
amplify
lifetime
preserving
value
short
face
spectral
blue
shifts
it.
The
findings
suggest
key
factor
enhancing
by
progressive
arrangement
aggregation
behaviors.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
63(6)
Published: Dec. 15, 2023
Abstract
Utilizing
intermolecular
hydrogen‐bonding
interactions
stands
for
an
effective
approach
in
advancing
the
efficiency
and
stability
of
small‐molecule
acceptors
(SMAs)
polymer
solar
cells.
Herein,
we
synthesized
three
SMAs
(Qo1,
Qo2,
Qo3)
using
indeno[1,2‐
b
]quinoxalin‐11‐one
(Qox)
as
electron‐deficient
group,
with
incorporation
a
methylation
strategy.
Through
crystallographic
analysis,
it
is
observed
that
two
Qox‐based
methylated
(Qo2
exhibit
multiple
hydrogen
bond‐assisted
3D
network
transport
structures,
contrast
to
2D
structure
gem‐dichlorinated
counterpart
(Qo4).
Notably,
Qo2
exhibits
stronger
compared
Qo3.
Consequently,
PM6
:
device
realizes
highest
power
conversion
(PCE)
18.4
%,
surpassing
efficiencies
devices
based
on
Qo1
(15.8
%),
Qo3
(16.7
Qo4
(2.4
%).
This
remarkable
PCE
can
be
primarily
ascribed
enhanced
donor‐acceptor
miscibility,
more
favorable
medium
structure,
efficient
charge
transfer
collection
behavior.
Moreover,
demonstrates
exceptional
thermal
stability,
retaining
82.8
%
its
initial
after
undergoing
annealing
at
65
°C
250
hours.
Our
research
showcases
precise
methylation,
particularly
targeting
formation
tune
crystal
packing
patterns,
represents
promising
strategy
molecular
design
stable
SMAs.
Energy & Environmental Science,
Journal Year:
2024,
Volume and Issue:
17(14), P. 4944 - 4967
Published: Jan. 1, 2024
Quinoxaline-based
nonfullerene
acceptors
show
highly
tunable
photoelectric
properties
and
superior
performance
for
sunlight
utilization
enabled
by
their
powerful
core-functionalization
ability.
ACS Energy Letters,
Journal Year:
2024,
Volume and Issue:
9(4), P. 1786 - 1795
Published: March 28, 2024
To
elucidate
the
pivotal
influence
of
molecular
geometry
in
fused-ring
nonfullerene
acceptors
(FRNFAs)
on
material
properties
and
device
performance
organic
solar
cells
(OSCs),
we
designed
synthesized
two
isomeric
molecules
C–F
S–F,
featuring
C-shaped
S-shaped
geometries
with
acceptor–donor–acceptor
conjugated
framework.
The
alteration
demonstrated
negligible
effects
optical
electrochemical
properties.
Significantly,
single
crystal
X-ray
crystallography
analyses
uncovered
that
exhibited
a
wave
network
packing,
while
S–F
favored
linear
brick
packing
intermolecular
end
groups,
different
from
previously
reported
three-dimensional
(3D)
stacking
Y
series
FRNFAs.
Despite
absence
3D
OSCs
utilizing
remarkable
power
conversion
efficiency
17.0%,
lower
voltage
loss
compared
to
devices
based
S–F.
This
study
further
underscores
essential
role
FRNFAs,
providing
valuable
insights
for
future
design
high-performance
OSCs.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 16, 2024
Abstract
Developing
a
new
end
group
for
synthesizing
asymmetric
small
molecule
acceptors
(SMAs)
is
crucial
achieving
high‐performance
organic
photovoltaics
(OPVs).
Herein,
an
acceptor,
BTP‐BO‐4FO,
featuring
difluoro‐methoxylated
end‐group
reported.
Compared
to
its
symmetric
counterpart
L8‐BO,
BTP‐BO‐4FO
exhibits
upshifted
energy
level,
larger
dipole
moment,
and
more
sequential
crystallinity.
By
adopting
two
representative
widely
available
solvent
additives
(1‐chloronaphthalene
(CN)
1,8‐diiodooctane
(DIO)),
the
device
based
on
PM6:BTP‐BO‐4FO
photovoltaic
blend
demonstrates
power
conversion
efficiency
(PCE)
of
18.62%
with
excellent
open‐circuit
voltage
(
V
OC
)
0.933
V,
which
surpasses
optimal
result
L8‐BO.
The
PCE
realizes
best
efficiencies
binary
OPVs
SMAs
groups.
A
series
investigations
reveal
that
optimized
film
similar
molecular
packing
motif
fibrillar
phase
distribution
as
PM6:L8‐BO
(DIO)
does,
resulting
in
comparable
recombination
dynamics,
thus,
fill
factor.
Besides,
it
found
possesses
efficient
charge
generation,
yields
better
–
J
SC
balance.
This
study
provides
ending
enables
cutting‐edge
SMA‐based
OPVs,
enriching
material
library
shed
light
further
design
ideas.
Chemical Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
elimination
of
the
A'
unit
from
-type
Y6-derivatives
has
led
to
development
a
new
class
ortho-benzodipyrrole
(o-BDP)-based
A-DNBND-A-type
NFAs.
In
this
work,
two
NFAs,
denoted
as
CFB
and
CMB,
are
designed
synthesized,
where
electron-withdrawing
fluorine
atoms
electron-donating
methyl
groups
substituted
on
benzene
ring
o-BDP
moiety,
respectively.
exhibits
blue-shifted
absorption
spectrum,
stronger
intermolecular
interactions,
shorter
π-π
stacking
distances,
more
ordered
3D
packing
in
neat
blend
films,
enabling
it
effectively
suppress
charge
recombination
PM6:CFB
device
showing
higher
PCE
16.55%
with
an
FF
77.45%.
CMB
displays
HOMO/LUMO
energy
level,
smaller
optical
bandgap,
less
packing,
which
contributes
its
superior
ability
loss
PM6:CMB
high
V
oc
0.90
16.46%.
To
leverage
advantages
ternary
PM6:Y6-16:CFB
PM6:Y6-16:CMB
devices
fabricated.
highest
17.83%
increased
0.86
J
sc
27.32
mA
cm-2,
while
displayed
elevated
0.87
improved
74.71%,
leading
17.44%.
was
achieved
using
non-halogenated
greener
solvent
o-xylene,
highlighting
their
potential
for
facilitating
eco-friendly
processing
procedures.
C-shaped
disubstituted
o-BDP-based
A-D-A
type
acceptors
open
up
avenues
tailoring
electronic
properties
molecular
self-assembly,
achieving
OPV
performance
enhanced
suppression
reduced
loss.
