Science China Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 15, 2024
Abstract
The
development
of
high-performance
near-infrared
(NIR)
absorbing
electron
acceptors
is
a
major
challenge
in
achieving
high
short-circuit
current
density
(
J
SC
)
to
increase
power
conversion
efficiency
(PCE)
organic
solar
cells
(OSCs).
Herein,
three
new
multi-heteroatomized
Y-series
(bi-asy-Y-Br,
bi-asy-Y-FBr,
and
bi-asy-Y-FBrF)
were
developed
by
combining
dual-asymmetric
selenium-fused
core
brominated
end-groups
with
different
numbers
fluorine
substitutions.
With
gradually
increasing
fluorination,
exhibit
red-shift
absorption.
Among
them,
bi-asy-Y-FBrF
presents
planar
molecular
geometry,
the
maximum
average
electrostatic
potential,
minimum
dipole
moment,
which
are
conducive
intramolecular
packing
charge
transport.
Moreover,
D18:bi-asy-Y-FBrF
active
layer
higher
crystallinity,
more
suitable
phase
separation,
reduced
recombination
compared
D18:bi-asy-Y-Br
D18:bi-asy-Y-FBr
blends.
Consequently,
among
theses
binary
OSCs,
device
achieves
PCE
15.74%
an
enhanced
26.28
mA
cm
−2
,
while
obtains
moderate
15.04%
highest
open-circuit
voltage
V
OC
0.926
V.
Inspired
its
complementary
absorption
NIR-absorbing
BTP-eC9
as
acceptor,
bi-asy-Y-Br
introduced
into
D18:BTP-eC9
construct
ternary
further
boosted
19.12%,
top
values
for
reported
green
solvent
processed
OSCs.
Advanced Energy Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 2, 2025
Abstract
In
recent
years,
polymer
solar
cells
(PSCs)
have
achieved
rapid
progress,
with
power
conversion
efficiencies
(PCEs)
reaching
up
to
20.25%,
driven
by
significant
advancements
in
device
fabrication
and
active‐layer
materials.
The
ternary
polymerization
strategy
has
proven
be
a
straightforward
effective
approach
for
developing
high‐performance
photoelectric
polymers
incorporating
third
monomer
into
the
backbone.
This
incorporation
effectively
optimizes
intrinsic
properties,
including
UV–vis
absorption,
energy
levels,
solubility,
crystallinity,
morphology,
charge
transfer,
mechanical
robustness,
batch‐to‐batch
reproducibility,
stability.
review
highlights
latest
designing
photoactive
copolymers
(both
donors
acceptors),
particular
focus
on
stability,
potential
applications
commercial
development.
aim
is
provide
valuable
guidance
development
of
materials
using
strategy.
Nano-Micro Letters,
Journal Year:
2025,
Volume and Issue:
17(1)
Published: April 1, 2025
Sequential
processing
(SqP)
of
the
active
layer
offers
independent
optimization
donor
and
acceptor
with
more
targeted
solvent
design,
which
is
considered
most
promising
strategy
for
achieving
efficient
organic
solar
cells
(OSCs).
In
SqP
method,
favorable
interpenetrating
network
seriously
depends
on
fine
control
bottom
swelling.
However,
choice
solvent(s)
both
have
been
mostly
based
a
trial-and-error
manner.
A
single
often
cannot
achieve
sufficient
yet
not
excessive
swelling,
has
long
difficulty
in
high
OSCs.
Herein,
two
new
isomeric
molecules
are
introduced
to
fine-tune
nucleation
crystallization
dynamics
that
allows
judicious
over
swelling
layer.
The
strong
non-covalent
interaction
between
molecule
materials
provides
an
excellent
driving
force
optimize
swelling-process.
Among
them,
dipole
moment
promotes
earlier
PM6
extended
time
during
SqP,
improving
bulk
morphology
vertical
phase
segregation.
As
result,
champion
efficiencies
17.38%
20.00%
(certified
19.70%)
achieved
PM6/PYF-T-o
(all-polymer)
PM6/BTP-eC9
devices
casted
by
toluene
solvent.
Journal of Materials Chemistry C,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Polyethylenimine
(PEI)
modified
with
tin(
ii
)
ions
serves
as
an
effective
electron
transport
layer
in
inverted
polymer
solar
cells,
achieving
a
power
conversion
efficiency
(PCE)
of
17.5%,
which
exceeds
the
15.7%
PCE
traditional
PEI-based
devices.
SusMat,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 8, 2025
ABSTRACT
In
organic
solar
cells
(OSCs),
typical
methods
for
fabricating
the
ternary
active
layer
are
blend‐casting
(BC)
or
two‐step
sequential
processing
(SqP‐2T),
where
all
three
at
least
two
components
blended
together,
which
affect
crystallization/aggregation
behavior
of
each
other
during
solid‐film
formation.
Herein,
we
introduce
first
time
a
novel
three‐step
method,
termed
SqP‐3T,
utilizes
hydrocarbon
solvents
to
prepare
high‐quality
layers.
Compared
SqP‐2T
and
BC
techniques,
SqP‐3T
yields
an
with
higher
acceptor
ratio
on
its
upper
surface
exhibits
longer
crystal
coherence
length
in
out‐of‐plane
direction
(21.42
Å).
These
characteristics
enhance
charge
transport
collection.
Additionally,
devices
demonstrate
nearly
twofold
increase
transient
photovoltage
decay
constant
(up
2.82
µs)
that
is
related
carrier
lifetime
certain
extent,
leading
reduced
recombination
losses.
Consequently,
device
achieves
high
fill
factor
(75.67%)
short‐circuit
current
density
(27.35
mA/cm
2
),
contributing
power
conversion
efficiency
19.2%.
results
highlight
potential
multi‐step
deposition
process
production
multicomponent
OSCs,
could
be
adopted
by
more
material
systems
future.
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.
