Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 18, 2024
Abstract
In
the
pursuit
of
high‐efficiency
polythiophene
(PT)
organic
solar
cells
(OSCs),
a
critical
challenge
is
reduction
nonradiative
recombination.
This
study
comprehensively
explores
polydithienylthiazolothiazole
(PTTz)‐based
PT
terpolymers:
PTTz‐Tz
and
PTTz‐TzT,
in
which
it
demonstrate
that
molecular
structure
alterations
greatly
influence
aggregation
kinetics
orientation
these
polymers.
Specifically,
PTTz‐TzT
achieves
rapid
ordering
during
spin
coating,
effectively
suppressing
excessive
polymer
facilitating
appropriate
phase
separation
upon
mixing
with
acceptor.
Meanwhile,
inherently
adopts
face‐on
orientation,
resulting
more
structured
π–π
stacking
vertical
direction
after
acceptor
integration,
compared
to
intrinsic
edge‐on
PTTz‐Tz.
These
factors
collectively
contribute
lower
Urbach
energy
substantial
recombination
PTTz‐TzT‐based
OSCs,
culminating
high
photovoltaic
conversion
efficiency
(PCE)
exceeding
16%.
Furthermore,
prominent
PCE
19.11%
obtained
by
via
ternary
blend
strategy,
among
highest
values
reported
for
OSCs.
investigation
underscores
significance
PT‐based
polymers,
especially
regarding
recombination,
offers
novel
insights
designing
high‐performance
donors.
Advanced Materials,
Год журнала:
2022,
Номер
34(32)
Опубликована: Июнь 20, 2022
A
record
power
conversion
efficiency
(PCE)
of
over
19%
is
realized
in
planar-mixed
heterojunction
(PMHJ)
organic
solar
cells
(OSCs)
by
adopting
the
asymmetric
selenium
substitution
strategy
making
a
pseudosymmetric
electron
acceptor,
BS3TSe-4F.
The
combined
molecular
asymmetry
with
more
polarizable
increases
dielectric
constant
D18/BS3TSe-4F
blend,
helping
lower
exciton
binding
energy.
On
other
hand,
dimer
packing
BS3TSe-4F
facilitated
to
enable
free
charge
generation,
efficient
dissociation
and
lowering
radiative
recombination
loss
(ΔE2
)
OSCs.
As
result,
PMHJ
OSCs
based
on
achieve
PCE
18.48%.
By
incorporating
another
mid-bandgap
acceptor
Y6-O
into
form
ternary
PMHJ,
higher
open-circuit
voltage
(VOC
can
be
achieved
realize
an
impressive
19.03%.
findings
using
acceptors
enhancing
device
provides
effective
way
develop
highly
materials
for
ACS Energy Letters,
Год журнала:
2022,
Номер
7(8), С. 2547 - 2556
Опубликована: Июль 13, 2022
Here,
we
combine
two
donor
polymers
with
a
relatively
short
synthesis
method
and
fabricate
ternary
organic
solar
cells
(OSCs)
high
efficiency
decent
figure-of-merit.
A
series
of
characterizations
show
that
the
optimal
morphology
blend
is
result
coupling
competition
PTQ10
PTVT-T,
where
molecular
packing
phase
separation
motif
broken
but
strong
aggregation
PTVT-T
suppressed,
resulting
in
efficient
charge
transport
collection,
as
well
suppressed
bimolecular
recombination.
Moreover,
previously
reported
solvent-vapor-assisted
casting
method,
taken
an
understanding-guided
optimization,
pushes
system's
to
19.11%.
Furthermore,
PTVT-T-containing
systems
clearly
better
light
soaking
thermal
stability
than
binary
control
system,
benefiting
from
durable
polymer
matrix.
Our
work
provides
useful
approach
for
developing
efficient,
stable,
low-cost
OSCs
based
on
state-of-the-art
donor/acceptor
through
design.
Energy & Environmental Science,
Год журнала:
2022,
Номер
15(8), С. 3519 - 3533
Опубликована: Янв. 1, 2022
The
diverse
molecular
stacking
tuned
by
peripheral
halogens
in
non-fullerene
acceptors
(NFAs)
significantly
affects
the
physicochemical
properties,
film
morphologies
and
thus
power
conversion
efficiencies
(PCEs)
of
organic
solar
cells
(OSCs).
Advanced Functional Materials,
Год журнала:
2023,
Номер
33(8)
Опубликована: Янв. 6, 2023
Abstract
Here,
a
near‐infrared
(NIR)‐absorbing
small‐molecule
acceptor
(SMA)
Y‐SeNF
with
strong
intermolecular
interaction
and
crystallinity
is
developed
by
combining
selenophene‐fused
core
naphthalene‐containing
end‐group,
then
as
custom‐tailor
guest
incorporated
into
the
binary
PM6:L8‐BO
host
system.
shows
65
nm
red‐shifted
absorption
compared
to
L8‐BO.
Thanks
of
Y‐SeNF,
morphology
PM6:L8‐BO:Y‐SeNF
can
be
precisely
regulated
introducing
achieving
improved
charge‐transporting
suppressed
non‐radiative
energy
loss.
Consequently,
ternary
polymer
solar
cells
(PSCs)
offer
an
impressive
device
efficiency
19.28%
both
high
photovoltage
(0.873
V)
photocurrent
(27.88
mA
cm
−2
),
which
one
highest
efficiencies
in
reported
single‐junction
PSCs.
Notably,
PSC
has
excellent
stability
under
maximum‐power‐point
tracking
for
even
over
200
h,
better
than
its
parental
devices.
The
study
provides
novel
strategy
construct
NIR‐absorbing
SMA
efficient
stable
PSCs
toward
practical
applications.
Abstract
The
power
conversion
efficiencies
(PCEs)
of
organic
solar
cells
(OSCs)
have
improved
considerably
in
recent
years
with
the
development
fused‐ring
electron
acceptors
(FREAs).
Currently,
FREAs‐based
OSCs
achieved
high
PCEs
over
19%
single‐junction
OSCs.
Whereas
relatively
synthetic
complexity
and
low
yield
FREAs
typically
result
production
costs,
hindering
commercial
application
In
contrast,
noncovalently
(NFREAs)
can
compensate
for
shortcomings
facilitate
large‐scale
industrial
by
virtue
simple
structure,
facile
synthesis,
yield,
cost,
reasonable
efficiency.
At
present,
based
on
NFREAs
exceeded
15%
are
expected
to
reach
comparable
efficiency
as
Here,
advances
this
review
provide
insight
into
improving
performance
particular,
paper
focuses
effect
chemical
structures
molecule
conformation,
aggregation,
packing
mode.
Various
molecular
design
strategies,
such
core,
side‐chain,
terminal
group
engineering,
presented.
addition,
some
novel
polymer
all‐polymer
also
introduced.
end,
provides
an
outlook
developing
efficient,
stable,
low‐cost
achieving
applications.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Окт. 9, 2023
Conjugated
polymers
are
generally
featured
with
low
structural
order
due
to
their
aromatic
and
irregular
units,
which
limits
light
absorption
charge
mobility
in
organic
solar
cells.
In
this
work,
we
report
a
conjugated
molecule
INMB-F
that
can
act
as
molecular
bridge
via
electrostatic
force
enhance
the
intermolecular
stacking
of
BDT-based
polymer
donors
toward
efficient
stable
Molecular
dynamics
simulations
synchrotron
X-ray
measurements
reveal
electronegative
adsorb
on
electropositive
main
chain
increase
donor-donor
interactions,
leading
enhanced
shortened
π-π
distance
consequently
transport
ability.
Casting
non-fullerene
acceptor
layer
top
modified
donor
fabricate
cells
layer-by-layer
deposition
evidences
significant
power
conversion
efficiency
boosts
range
photovoltaic
systems.
A
19.4%
(certified
18.96%)
is
realized
PM6/L8-BO
binary
devices,
one
highest
reported
efficiencies
material
system.
The
by
also
leads
six-fold
enhancement
operational
stability
ACS Energy Letters,
Год журнала:
2023,
Номер
8(2), С. 1058 - 1067
Опубликована: Янв. 23, 2023
Herein,
an
emerging
acceptor
L8-BO
as
the
third
component
was
combined
with
B1:BO-4Cl
system
for
constructing
efficient
ternary
all-small-molecule
organic
solar
cells
(ASM-OSCs).
Theoretical,
morphological,
and
crystallographic
studies
reveal
that
BO-4Cl
possess
good
compatibility,
resulting
in
alloy-like
state
formation
of
two
acceptors
blends.
The
synergistic
effect
is
conducive
to
forming
favorable
phase
separation
molecular
stacking
promoting
charge
splitting
extraction,
which
contributes
simultaneously
boosting
short-circuit
current
density
fill
factor.
Furthermore,
higher
lowest
unoccupied
orbital
energy
level
assist
ASM-OSCs
achieving
lower
voltage
loss
respect
binary
devices.
optimal
20
wt
%
deliver
a
top-level
efficiency
17.10%.
This
work
demonstrates
not
only
morphology
but
also
small
matrix
can
be
well-manipulated
by
employing
strategy.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
62(30)
Опубликована: Май 26, 2023
Abstract
The
central
core
in
A‐DA
1
D‐A‐type
small‐molecule
acceptor
(SMAs)
plays
an
important
role
determining
the
efficiency
of
organic
solar
cells
(OSCs),
while
principles
governing
efficient
design
SMAs
remain
elusive.
Herein,
we
developed
a
series
with
pyrido[2,3‐
b
]quinoxaline
(PyQx)
as
new
electron‐deficient
unit
by
combining
cascade‐chlorination
strategy,
namely
Py1,
Py2,
Py3,
Py4
and
Py5.
introduction
chlorine
atoms
reduces
intramolecular
charge
transfer
effects
but
elevates
LUMO
values.
Density
functional
theory
(DFT)
reveals
that
Py2
ortho
substituted
PyQx
Py5
two
yield
larger
dipole
moments
smaller
π⋅⋅⋅π
stacking
distances,
compared
other
three
acceptors.
Moreover,
shows
strongest
light
absorption
capability
induced
extended
orbit
overlap
lengths
more
packing
structures
dimers.
These
features
endow
best
device
performance
due
to
better
molecular
aggregation
behaviors,
suitable
domain
sizes
exciton
dissociation
recombination.
This
study
highlights
significance
incorporating
large
moments,
small
distances
dimers
into
development
high‐performance
SMAs,
providing
insight
for
OSCs.
Energy & Environmental Science,
Год журнала:
2023,
Номер
16(7), С. 2732 - 2758
Опубликована: Янв. 1, 2023
This
review
summarizes
the
side-chain
engineering
of
nonfullerene
small-molecule
acceptors
(SMAs)
in
field
organic
solar
cells,
discusses
key
structure–property
relationships
depth
and
future
directions
engineering.