Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
137(1)
Published: Sept. 12, 2024
Abstract
The
difluorobenzothiadizole
(ffBT)
unit
is
one
of
the
most
classic
electron‐accepting
building
blocks
used
to
construct
D‐A
copolymers
for
applications
in
organic
solar
cells
(OSCs).
Historically,
ffBT‐based
polymers
have
achieved
record
power
conversion
efficiencies
(PCEs)
fullerene‐based
OSCs
owing
their
strong
temperature‐dependent
aggregation
(TDA)
characteristics.
However,
excessive
miscibility
and
rapid
kinetics
during
film
formation
hindered
performance
with
state‐of‐the‐art
non‐fullerene
acceptors
(NFAs).
Herein,
we
synthesized
two
copolymers,
PffBT‐2T
PffBT‐4T,
incorporating
different
π‐bridges
modulate
intermolecular
interactions
tendencies.
Experimental
theoretical
studies
revealed
that
PffBT‐4T
exhibits
reduced
electrostatic
potential
differences
L8‐BO
compared
PffBT‐2T.
This
facilitates
improved
phase
separation
active
layer,
leading
enhanced
molecular
packing
optimized
morphology.
Moreover,
demonstrated
a
prolonged
nucleation
crystal
growth
process,
Consequently,
PffBT‐4T‐based
devices
remarkable
PCE
17.5
%,
setting
new
photovoltaic
polymers.
Our
findings
underscore
importance
conjugate
backbone
modulation
controlling
behavior
kinetics,
providing
valuable
insights
design
high‐performance
polymer
donors
photovoltaics.
Advanced Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
Conjugated
polymers
can
undergo
complex,
concentration‐dependent
self‐assembly
during
solution
processing,
yet
little
is
known
about
its
impact
on
film
morphology
and
device
performance
of
organic
solar
cells.
Herein,
lyotropic
liquid
crystal
(LLC)
mediated
assembly
across
multiple
conjugated
reported,
which
generally
gives
rise
to
improved
blade‐coated
non‐fullerene
bulk
heterojunction
Using
D18
as
a
model
system,
the
formation
mechanism
LLC
unveiled
employing
X‐ray
scattering
microscopic
imaging
tools:
first
aggregates
into
semicrystalline
nanofibers,
then
assemble
achiral
nematic
goes
through
symmetry
breaking
yield
chiral
twist‐bent
LLC.
The
pathway
driven
by
increasing
concentration
–
common
driving
force
evaporative
relevant
scalable
manufacturing.
This
be
largely
modulated
coating
regimes
give
1)
crystalline
in
evaporation
regime
2)
random
fiber
aggregation
Landau–Levich
regime.
resulted
films
with
crystallinity
2.63
times
that
from
pathway,
significantly
enhancing
T80
lifetime
50‐fold.
generality
LLC‐mediated
enhanced
further
validated
using
polythiophene
quinoxaline‐based
donor
polymers.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
63(44)
Published: July 11, 2024
Abstract
Overcoming
the
trade‐off
between
short‐circuited
current
(
J
sc
)
and
open‐circuited
voltage
V
oc
is
important
to
achieving
high‐efficiency
organic
solar
cells
(OSCs).
Previous
works
modulated
energy
gap
Frenkel
local
exciton
(LE)
charge‐transfer
(CT)
exciton,
which
served
as
driving
force
of
splitting.
Differently,
our
work
focuses
on
modulation
LE‐CT
excitonic
coupling
(t
via
a
simple
but
effective
strategy
that
2‐chlorothiophene
(2Cl−Th)
solvent
utilizes
in
treatment
OSC
active‐layer
films.
The
results
experimental
measurements
theoretical
simulations
demonstrated
2Cl−Th
initiates
tighter
intermolecular
interactions
with
non‐fullerene
acceptor
comparison
traditional
chlorobenzene
solvent,
thus
suppressing
acceptor's
over‐aggregation
retarding
crystallization
reduced
trap.
Critically,
resulting
shorter
distances
donor
molecules
treated
blend
efficiently
strengthen
t
,
not
only
promotes
splitting
also
reduces
non‐radiative
recombination.
champion
efficiencies
19.8
%
(small‐area)
superior
operational
reliability
(T80:
586
hours)
17.0
(large‐area)
were
yielded
cells.
This
provided
new
insight
into
modulating
dynamics
overcome
can
productively
promote
development
field.
Angewandte Chemie International Edition,
Journal Year:
2024,
Volume and Issue:
64(1)
Published: Sept. 12, 2024
The
difluorobenzothiadizole
(ffBT)
unit
is
one
of
the
most
classic
electron-accepting
building
blocks
used
to
construct
D-A
copolymers
for
applications
in
organic
solar
cells
(OSCs).
Historically,
ffBT-based
polymers
have
achieved
record
power
conversion
efficiencies
(PCEs)
fullerene-based
OSCs
owing
their
strong
temperature-dependent
aggregation
(TDA)
characteristics.
However,
excessive
miscibility
and
rapid
kinetics
during
film
formation
hindered
performance
with
state-of-the-art
non-fullerene
acceptors
(NFAs).
Herein,
we
synthesized
two
copolymers,
PffBT-2T
PffBT-4T,
incorporating
different
π-bridges
modulate
intermolecular
interactions
tendencies.
Experimental
theoretical
studies
revealed
that
PffBT-4T
exhibits
reduced
electrostatic
potential
differences
L8-BO
compared
PffBT-2T.
This
facilitates
improved
phase
separation
active
layer,
leading
enhanced
molecular
packing
optimized
morphology.
Moreover,
demonstrated
a
prolonged
nucleation
crystal
growth
process,
Consequently,
PffBT-4T-based
devices
remarkable
PCE
17.5
%,
setting
new
photovoltaic
polymers.
Our
findings
underscore
importance
conjugate
backbone
modulation
controlling
behavior
kinetics,
providing
valuable
insights
design
high-performance
polymer
donors
photovoltaics.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 28, 2024
Abstract
Developing
stable
and
highly
efficient
thick‐film
organic
solar
cells
(OSCs)
is
crucial
for
the
large‐scale
commercial
application
of
photovoltaics.
A
novel
synergistic
dilution
strategy
to
address
this
issue,
using
Polymethyl
Methacrylate
(PMMA)
‐modified
zinc
oxide
(ZnO)
as
interfacial
layer,
introduced.
This
effectively
mitigates
oxygen
defects
in
ZnO
while
also
regulating
self‐assembly
process
active
layer
achieve
an
ordered
distribution
donors
acceptors.
In
diluted
devices,
dynamic
disorder
reduced
owing
suppression
electron‐phonon
coupling,
static
suppressed
by
improved
molecular
stacking
enhanced
intermolecular
interactions.
Consequently,
300
nm
PM6:L8‐BO
device
post‐synergistic
manifests
a
marked
enhancement
performance,
achieving
photovoltaic
power
conversion
efficiency
(PCE)
>17%
with
excellent
thermal
stability.
typical
ternary
system
selected
explore
general
applicability
strategy,
PCE
has
been
significantly
from
17.89%
18.72%,
which
falls
within
range
highest
values
among
inverted
single
junction
OSCs.
As
practical
that
depends
on
pivotal
synergy
between
high
stability,
approach
paves
way
implementation
OSCs
ensures
cost‐effectiveness.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 16, 2025
Abstract
Organic
solar
cells
(OSCs)
have
garnered
significant
attention
owing
to
the
light
weight,
flexibility,
and
low
cost.
Continuous
improvement
in
molecular
design,
morphology
control,
device
fabrication
has
propelled
power
conversion
efficiency
of
OSCs
beyond
20%.
While
obtaining
long‐term
stability
is
still
a
critical
obstacle
for
commercialization
OSCs.
The
nano‐
microstructural
characteristics
active
layer
morphology—including
stacking,
phase
separation,
domain
sizes—play
pivotal
role
determining
performance.
Consequently,
comprehensive
understanding
how
film
structure
impacting
methods
control
are
vital
improving
lifetime.
This
review
seeks
elucidate
structure–performance
relationship
between
from
nanoscale
microscale
stability.
It
can
provide
rational
guidance
enhance
accelerating
Advanced Science,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 20, 2025
Solid
additives
are
crucial
in
layer-by-layer
(LBL)
polymer
solar
cells
(PSCs).
Despite
its
importance,
the
simultaneous
application
of
solid
into
both
donor
and
acceptor
layers
has
been
largely
overlooked.
In
this
work,
two
multifunctional
actively
designed,
investigated
synergistic
effect
on
layers.
Incorporating
layer
could
effectively
enhance
aggregation
molecular
stacking
polymer,
leading
to
reduced
energy
disorder
minimizing
ΔE2.
When
introduced
layer,
they
just
play
a
role
optimizing
morphology,
thereby
reducing
ΔE3.
Excitedly,
addition
produced
for
decreasing
ΔE2
ΔE3
simultaneously,
especially
adding
SA2,
thus
enabling
an
excellent
power
conversion
efficiency
(PCE)
19.95%
(certified
as
19.68%)
with
open-circuit
voltage
(Voc)
0.921
V,
short
circuit
current
density
(Jsc)
27.08
mA
cm-2
fill
factor
(FF)
79.98%.
The
work
highlights
potential
independently
regulating
properties
layers,
which
is
expected
promising
approach
further
developing
higher
performance
PSCs.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 17, 2025
Abstract
It
is
necessary
to
employ
high‐boiling
solvents
for
the
fabrication
of
large‐area
organic
solar
cells
(OSCs).
However,
controlling
morphology
achieve
suitable
phase
separation
high
efficiency
challenging
when
are
used.
In
this
study,
HD‐1,
a
small
molecular
donor
introduced,
into
PM6:BO‐4Cl
blend
as
morphology‐modulating
agent.
This
addition
optimizes
and
enhances
charge
transport
in
ternary
processed
chlorobenzene
(CB)
solvent.
The
optimized
active
layer
demonstrates
improved
dissociation
capabilities
while
effectively
suppressing
recombination.
Small‐area
OSCs
from
CB
solution
achieves
an
power
conversion
(PCE),
increasing
18.84%
19.42%.
Furthermore,
device
demonstrated
good
tolerance
thickness,
with
300‐nm‐thick
film
achieving
PCE
exceeding
17%.
Notably,
blade‐coated
module
area
13.5
cm
2
,
fabricated
air
using
CB,
16.48%,
showing
excellent
application
potential.
study
presents
straightforward
effective
approach
optimizing
enhancing
fabricate
solvent,
highlighting
its
potential
large‐scale
production
practical
applications.
Chinese Journal of Chemistry,
Journal Year:
2024,
Volume and Issue:
42(24), P. 3581 - 3587
Published: Nov. 4, 2024
Comprehensive
Summary
Layer‐by‐layer
(LbL)
solution
processing
is
an
efficient
method
to
realize
high
performance
organic
solar
cells
(OSCs).
One
of
the
drawbacks
LbL‐processed
active
layer
large
difference
in
crystallinity
donor
and
acceptor,
which
will
lead
imbalance
charge
transfer
result
unfavorable
recombination.
Herein,
we
combined
a
novel
volatile
additive
3,5‐dichloro‐2,4,6‐
trifluorobenzotrifluoride
(DTBF)
with
LbL
high‐efficiency
OSCs.
DTBF
interacts
non‐fullerene
acceptor
BTP‐4F
by
non‐covalent
bonding,
enhances
compact
stacking
BTP‐4F.
doped
OSC
has
balanced
electron
transport
properties,
longer
carrier
lifetime,
higher
exciton
dissociation
collection
efficiencies,
lower
energetic
disorder
than
control
without
any
additives.
Benefiting
from
optimization
dynamics
micro‐morphology
DTBF,
binary
achieved
synergistic
improvements
open‐circuit
voltage,
short‐circuit
current
density
fill
factor.
As
result,
champion
power
conversion
efficiency
(
PCE
)
19%
realized
for
DTBF‐optimized
OSC,
superior
(17.55%).
This
work
demonstrates
promising
approach
modulate
morphology
fabricate
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(44)
Published: July 11, 2024
Abstract
Overcoming
the
trade‐off
between
short‐circuited
current
(
J
sc
)
and
open‐circuited
voltage
V
oc
is
important
to
achieving
high‐efficiency
organic
solar
cells
(OSCs).
Previous
works
modulated
energy
gap
Frenkel
local
exciton
(LE)
charge‐transfer
(CT)
exciton,
which
served
as
driving
force
of
splitting.
Differently,
our
work
focuses
on
modulation
LE‐CT
excitonic
coupling
(t
via
a
simple
but
effective
strategy
that
2‐chlorothiophene
(2Cl−Th)
solvent
utilizes
in
treatment
OSC
active‐layer
films.
The
results
experimental
measurements
theoretical
simulations
demonstrated
2Cl−Th
initiates
tighter
intermolecular
interactions
with
non‐fullerene
acceptor
comparison
traditional
chlorobenzene
solvent,
thus
suppressing
acceptor's
over‐aggregation
retarding
crystallization
reduced
trap.
Critically,
resulting
shorter
distances
donor
molecules
treated
blend
efficiently
strengthen
t
,
not
only
promotes
splitting
also
reduces
non‐radiative
recombination.
champion
efficiencies
19.8
%
(small‐area)
superior
operational
reliability
(T80:
586
hours)
17.0
(large‐area)
were
yielded
cells.
This
provided
new
insight
into
modulating
dynamics
overcome
can
productively
promote
development
field.
