Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 21, 2025
Abstract
Regulating
blend
morphology
in
photoactive
films
is
essential
for
enhancing
the
power
conversion
efficiency
(PCE)
of
organic
solar
cells
(OSCs).
However,
achieving
precise
control
over
remains
a
significant
challenge
due
to
difficulty
simultaneously
controlling
thermodynamic
and
kinetic
parameters
that
govern
formation.
In
this
study,
series
new
small‐molecule
acceptors
(SMAs)
employing
dual
side
chain
functionalization
strategy
designed
incorporates
trifluoromethyl
(CF
3
)
phenyl
(Ph)
groups:
SMA‐CH
,
SMA‐CF
(with
CF
group),
SMA‐Ph‐CF
both
groups).
This
approach
successfully
enables
delicate
tuning
development
high‐performance
OSCs
(PCE
=
18.5%).
enhances
compatibility
SMAs
with
hydrophobic
D18
polymer
donor,
promoting
formation
intermixed
donor/acceptor
domains
efficient
charge
generation.
Meanwhile,
improves
SMA
aggregation
crystallinity,
facilitating
strong
interconnected
assembly
transport.
As
result,
binary
based
on
D18:SMA‐Ph‐CF
achieve
significantly
higher
PCE
18.5%,
compared
14.3%
D18:SMA‐CH
16.5%
D18:SMA‐CF
OSCs.
These
results
highlight
importance
optimizing
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Авг. 10, 2024
The
nanoscale
fibrillar
morphology,
featuring
long-range
structural
order,
provides
abundant
interfaces
for
efficient
exciton
dissociation
and
high-quality
pathways
effective
charge
transport,
is
a
promising
morphology
high
performance
organic
solar
cells.
Here,
we
synthesize
thiophene
terminated
non-fullerene
acceptor,
L8-ThCl,
to
induce
the
fibrillization
of
both
polymer
donor
host
that
surpasses
20%
efficiency
milestone
After
adding
original
weak
less
continuous
nanofibrils
donors,
i.e.
PM6
or
D18,
are
well
enlarged
refined,
whilst
acceptor
L8-BO
also
assembles
into
with
enhanced
order.
By
adapting
layer-by-layer
deposition
method,
order
can
be
retained
significantly
boost
power
conversion
efficiency,
specific
values
19.4%
20.1%
PM6:L8-ThCl/L8-BO:L8-ThCl
D18:L8-ThCl/L8-BO:L8-ThCl
devices,
latter
being
certified
20.0%,
which
highest
reported
so
far
single-junction
Advanced Materials,
Год журнала:
2024,
Номер
36(30)
Опубликована: Май 11, 2024
Rational
molecular
design
and
suitable
device
engineering
are
two
important
strategies
to
boost
the
efficiencies
in
organic
solar
cells
(OSCs).
Yet
these
approaches
independently
developed,
while
their
synergy
is
believed
be
more
productive.
Herein,
a
branched
polyfluoride
moiety,
heptafluoroisopropoxyl
group,
introduced
into
side
chains
of
conjugated
polymers
for
first
time.
Compared
with
conventional
alkyl
chain,
this
chain
can
endow
resulting
polymer
namely
PF7
highly
packing
order
strong
crystallinity
owing
polarization
fluorine-induced
interactions,
good
solubility
moderate
miscibility
retained.
As
result,
comprehensively
outperforms
state-of-the-art
PM6
photovoltaic
properties.
More
importantly,
based
on
groups
fluorous
solvents,
new
post-treatment
denoted
as
solvent
vapor
annealing
(FSVA)
proposed
match
PF7.
Differing
from
existing
post-treatments,
FSVA
selectively
reorganize
fluoropolymer
molecules
but
less
impact
small
blend
films.
By
employing
solvent,
achieves
remarkable
efficiency
19.09%,
which
among
best
binary
OSCs.
The
treatment
exhibit
excellent
universality
various
OSCs
different
material
combinations
or
architectures.
Abstract
Halogenation
of
Y‐series
small‐molecule
acceptors
(Y‐SMAs)
is
identified
as
an
effective
strategy
to
optimize
photoelectric
properties
for
achieving
improved
power‐conversion‐efficiencies
(PCEs)
in
binary
organic
solar
cells
(OSCs).
However,
the
effect
different
halogenation
2D‐structured
large
π‐fused
core
guest
Y‐SMAs
on
ternary
OSCs
has
not
yet
been
systematically
studied.
Herein,
four
2D‐conjugated
(X‐QTP‐4F,
including
halogen‐free
H‐QTP‐4F,
chlorinated
Cl‐QTP‐4F,
brominated
Br‐QTP‐4F,
and
iodinated
I‐QTP‐4F)
by
attaching
halogens
into
2D‐conjugation
extended
dibenzo[
f
,
h
]quinoxaline
are
developed.
Among
these
X‐QTP‐4F,
Cl‐QTP‐4F
a
higher
absorption
coefficient,
optimized
molecular
crystallinity
packing,
suitable
cascade
energy
levels,
complementary
with
PM6:L8‐BO
host.
Moreover,
among
PM6:L8‐BO:X‐QTP‐4F
blends,
PM6:L8‐BO:Cl‐QTP‐4F
obtains
more
uniform
size‐suitable
fibrillary
network
morphology,
well
vertical
phase
distribution,
thus
boosting
charge
generation,
transport,
extraction,
suppressing
loss
OSCs.
Consequently,
PM6:L8‐BO:Cl‐QTP‐4F‐based
achieve
19.0%
efficiency,
which
state‐of‐the‐art
based
superior
devices
host
(17.70%)
guests
H‐QTP‐4F
(18.23%),
Br‐QTP‐4F
(18.39%),
I‐QTP‐4F
(17.62%).
The
work
indicates
that
promising
gain
efficient
Advanced Materials,
Год журнала:
2024,
Номер
36(41)
Опубликована: Авг. 17, 2024
Abstract
The
performance
of
organic
photodetectors
(OPDs)
sensitive
to
the
short‐wavelength
infrared
(SWIR)
light
lags
behind
commercial
indium
gallium
arsenide
(InGaAs)
primarily
due
scarcity
semiconductors
with
efficient
photoelectric
responses
exceeding
1.3
µm.
Limited
by
Energy‐gap
law,
ultralow‐bandgap
usually
suffer
from
severe
non‐radiative
transitions,
resulting
in
low
external
quantum
efficiency
(EQE).
Herein,
a
difluoro‐substituted
quinoid
terminal
group
(QC‐2F)
exceptionally
strong
electron‐negativity
is
developed
for
constructing
new
non‐fullerene
acceptor
(NFA),
Y‐QC4F
an
ultralow
bandgap
0.83
eV.
This
subtle
structural
modification
significantly
enhances
intermolecular
packing
order
and
density,
enabling
absorption
onset
up
1.5
µm
while
suppressing
non‐radiation
recombination
films.
SWIR
OPDs
based
on
achieve
impressive
detectivity
(
D
*)
over
10
11
Jones
0.4
under
0
V
bias,
maximum
1.68
×
12
at
1.16
Furthermore,
demonstrate
competitive
high‐quality
imaging
even
1.4
irradiation.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(30)
Опубликована: Май 9, 2024
Abstract
Dimeric
acceptor
(DMA)
becomes
a
promising
alternative
to
small‐molecular
and
polymeric
acceptor‐based
organic
solar
cells
(OSCs)
due
its
well‐defined
chemical
structure,
high
batch‐to‐batch
reproducibility,
low
molecular
diffusion
properties.
However,
DMAs
usually
exhibit
blueshifted
absorptions,
limiting
their
photon
utilization
abilities.
Herein,
multi‐selenophene
strategies
are
adopted
develop
redshifted
DMAs.
From
monomer
(YSe)
dimers
(DYSe‐1
DYSe‐2),
reduced
electron
reorganization
energies
exciton
binding
enable
the
efficient
charge
dynamics
in
DMAs‐based
OSCs.
Together
with
effective
absorption
extending
≈920
nm,
DYSe‐1‐
DYSe‐2‐
based
OSCs
outstanding
short‐circuit
current
densities
(
J
SC
s)
over
27
mA
cm
−2
,
which
best
among
Besides,
compared
YSe‐based
device,
both
DMA‐based
devices
have
higher
electroluminescence
quantum
efficiencies
thus
reduce
nonradiative
recombination
loss
(ΔE
3
),
contributing
energy
losses.
The
resultant
open‐circuit
voltages
V
OC
of
≈0.88
V,
which,
combining
super
values,
lead
power
conversion
18.56%
18.22%,
respectively.
These
results
highlight
great
potential
strategy
for
development
performance.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(14), С. 5137 - 5146
Опубликована: Янв. 1, 2024
This
research
provides
valuable
references
for
the
design
of
electron
acceptors
addressing
“efficiency-cost-stability”
triangle,
thus
advancing
commercialization
organic
solar
cells
(OSCs).
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.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 25, 2024
Abstract
Organic
solar
cells
(OSCs)
have
emerged
as
promising
candidates
for
renewable
energy
harvesting
due
to
their
lightweight,
flexible,
and
low‐cost
fabrication
potential.
The
efficiency
of
OSCs
is
largely
determined
by
the
choice
solvents,
which
significantly
affect
film
morphology
active
layers,
intermixed
donor‐acceptor
domains,
overall
device
performance.
Beginning
with
an
introduction
importance
solvent
selection,
screening
classification
emphasizing
characteristics
based
on
sustainability,
solubility,
other
additional
considerations
are
explored.
Various
non‐halogenated
highlighting
commonly
used
aromatic
biomass‐derived
water/alcohol‐based
solvents
state‐of‐the‐art
donor
acceptor
materials,
focusing
efficient
materials
such
PM6
D18,
high‐performing
Y‐series
acceptors
also
presented.
Strategies
developing
high‐performance
processed
using
examined,
including
engineering
additive
additive‐free
approaches,
ternary
strategies,
layer‐by‐layer
techniques.
large‐area
devices
addressed,
blade‐coating,
slot‐coating,
processing
Finally,
this
review
outlines
future
research
directions
in
OSCs,
need
continuous
innovation
overcome
existing
limitations
propel
OSC
technology
toward
commercial
viability.
