Advanced Energy Materials,
Journal Year:
2024,
Volume and Issue:
14(17)
Published: Feb. 8, 2024
Abstract
The
conjugated
small‐molecule
materials
of
organic
solar
cells
have
always
played
a
crucial
role
in
light‐harvesting,
charge
transport,
morphology
optimization,
and
the
attainment
efficient
devices.
advancement
novel
understanding
underlying
molecular
design
rules
serve
as
driving
force
for
furthering
stable
photovoltaic
Among
variety
principles,
symmetry‐breaking
strategy,
which
is
well
developed
3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]dithiophene
(ITIC)‐series
acceptors,
recently
demonstrates
great
potential
acceptors
donors
realizing
high
power
conversion
efficiency.
In
this
review,
order
to
give
deep
insight
on
asymmetric
are
systematically
summarized
with
structure
elucidate
structure‐performance
relationship,
packing
behaviors,
evolution.
Not
only
delicate
balance
between
open
circuit
voltage
short‐circuit
current
density,
but
also
reductions
recombination
non‐radiative
considered
play
key
points
improving
performance
when
molecule
used
host
or
guest
materials.
Finally,
concise
challenges
outlooks
provided
future
development
application
molecules
strategies.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
35(21)
Published: March 4, 2023
Abstract
The
limited
selection
pool
of
high‐performance
wide
bandgap
(WBG)
polymer
donors
is
a
bottleneck
problem
the
nonfullerene
acceptor
(NFA)
based
organic
solar
cells
(OSCs)
that
impedes
further
improvement
their
photovoltaic
performances.
Herein,
series
new
WBG
polymers,
namely
PH‐BTz,
PS‐BTz,
PF‐BTz,
and
PCl‐BTz,
are
developed
by
using
bicyclic
difluoro‐benzo[d]thiazole
(BTz)
as
block
benzo[1,2‐b:4,5‐b′]dithiophene
(BDT)
derivatives
donor
units.
By
introducing
S,
F,
Cl
atoms
to
alkylthienyl
sidechains
on
BDT,
resulting
polymers
exhibit
lowered
energy
levels
enhanced
aggregation
properties.
fluorinated
PBTz‐F
not
only
exhibits
low‐lying
HOMO
level,
but
also
has
stronger
face‐on
packing
order
results
in
more
uniform
fibril‐like
interpenetrating
networks
related
PF‐BTz:L8‐BO
blend.
A
high‐power
conversion
efficiency
(PCE)
18.57%
achieved.
Moreover,
good
batch‐to‐batch
reproducibility
general
applicability.
In
addition,
ternary
blend
OSCs
host
PBTz‐F:L8‐BO
PM6
guest
PCE
19.54%,
which
among
highest
values
OSCs.
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
62(36)
Published: July 18, 2023
Achieving
both
high
open-circuit
voltage
(Voc
)
and
short-circuit
current
density
(Jsc
to
boost
power-conversion
efficiency
(PCE)
is
a
major
challenge
for
organic
solar
cells
(OSCs),
wherein
energy
loss
(Eloss
inefficient
charge
transfer
usually
take
place.
Here,
three
new
Y-series
acceptors
of
mono-asymmetric
asy-YC11
dual-asymmetric
bi-asy-YC9
bi-asy-YC12
are
developed.
They
share
the
same
asymmetric
D1
AD2
(D1
=thieno[3,2-b]thiophene
D2
=selenopheno[3,2-b]thiophene)
fused-core
but
have
different
unidirectional
sidechain
on
side,
allowing
fine-tuned
molecular
properties,
such
as
intermolecular
interaction,
packing
pattern,
crystallinity.
Among
binary
blends,
PM6
:
one
has
better
morphology
with
appropriate
phase
separation
higher
order
than
asy-YC9
bi-asy-YC11
ones.
Therefore,
bi-asy-YC12-based
OSCs
offer
PCE
17.16
%
Voc
Jsc
,
due
reduced
Eloss
efficient
properties.
Inspired
by
strong
NIR-absorption,
introduced
into
L8-BO
construct
ternary
OSCs.
Thanks
broadened
absorption,
optimized
morphology,
furtherly
minimized
achieve
champion
19.23
%,
which
highest
efficiencies
among
these
annealing-free
devices.
Our
developed
engineering
constructing
bi-asymmetric
provides
an
approach
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(4)
Published: Nov. 23, 2023
Abstract
Three
nonfused
ring
electron
acceptors
(NFREAs),
namely,
3TT‐C2‐F
,
3TT‐C2‐Cl
and
3TT‐C2
are
purposefully
designed
synthesized
with
the
concept
of
halogenation.
The
incorporation
F
or/and
Cl
atoms
into
molecular
structure
(
)
enhances
π–π
stacking,
improves
mobility,
regulates
nanofiber
morphology
blend
films,
thus
facilitating
exciton
dissociation
charge
transport.
In
particular,
films
based
on
D18:
demonstrate
a
high
an
extended
diffusion
distance,
well‐formed
network.
These
factors
contribute
to
devices
remarkable
power
conversion
efficiency
17.19%,
surpassing
that
(16.17%)
(15.42%).
To
best
knowledge,
this
represents
highest
achieved
in
NFREA‐based
up
now.
results
highlight
potential
halogenation
NFREAs
as
promising
approach
enhance
performance
organic
solar
cells.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(41)
Published: Sept. 1, 2024
This
study
underscores
the
significance
of
precisely
manipulating
morphology
active
layer
in
organic
solar
cells
(OSCs).
By
blending
polymer
donors
D18
with
varying
molecular
weights,
a
multiscale
interpenetrating
fiber
network
structure
within
is
successfully
created.
The
introduction
10%
low
weight
(LW-D18)
into
high
(HW-D18)
produces
MIX-D18,
which
exhibits
an
extended
exciton
diffusion
distance
and
orderly
stacking.
Devices
utilizing
MIX-D18
demonstrate
superior
electron
hole
transport,
improves
dissociation,
enhances
charge
collection
efficiency,
reduces
trap-assisted
recombination
compared
to
other
two
materials.
Through
use
nonfullerene
acceptor
L8-BO,
remarkable
power
conversion
efficiency
(PCE)
20.0%
achieved.
methodology,
integrates
favorable
attributes
polymers,
opens
new
avenue
for
enhancing
performance
OSCs.
Small,
Journal Year:
2024,
Volume and Issue:
20(24)
Published: Jan. 29, 2024
Abstract
Ternary
organic
solar
cells
(T‐OSCs)
have
attracted
significant
attention
as
high‐performance
devices.
In
recent
years,
T‐OSCs
achieved
remarkable
progress
with
power
conversion
efficiency
(PCE)
exceeding
19%.
However,
the
introduction
of
third
component
complicates
intermolecular
interaction
compared
to
binary
blend,
resulting
in
poor
controllability
active
layer
and
limiting
performance
improvement.
To
address
these
issues,
dual‐functional
components
been
developed
that
not
only
broaden
spectral
range
but
also
optimize
morphology.
this
review,
effect
on
expanding
absorption
is
first
discussed.
Second,
extra
functions
are
introduced,
including
adjusting
crystallinity
molecular
stack
layer,
regulating
phase
separation
purity,
altering
orientation
donor
or
acceptor.
Finally,
a
summary
current
research
provided,
followed
by
discussion
future
directions.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(12), P. 15121 - 15132
Published: March 19, 2024
Acquiring
the
ideal
blend
morphology
of
active
layer
to
optimize
charge
separation
and
collection
is
a
constant
goal
polymer
solar
cells
(PSCs).
In
this
paper,
ternary
strategy
sequential
deposition
process
were
combined
make
sufficient
use
spectrum,
energy-level
structure,
regulate
vertical
phase
morphology,
ultimately
enhance
power
conversion
efficiency
(PCE)
stability
PSCs.
Specifically,
donor
acceptor
illustrated
gradient-blended
distribution
in
deposition-processed
films,
thus
resulting
facilitated
carrier
characteristics
devices.
Consequently,
PSCs
based
on
D18-Cl/Y6:ZY-4Cl
have
achieved
device
over
18%
with
synergetic
improvement
open-circuit
voltage
(VOC),
short-circuit
current
density
(JSC),
fill
factor
(FF).
Therefore,
work
reveals
facile
approach
fabricating
improved
performance
stability.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: April 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 Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(44)
Published: June 2, 2024
Abstract
Reducing
non‐radiative
energy
loss
(∆
E
nr
)
is
critical
for
enhancing
the
photovoltaic
performance
of
organic
solar
cells
(OSCs).
To
achieve
this,
a
small
molecular
donor,
LJ1,
introduced
as
third
component
in
host
system
D:
A
(D18:
BTP‐eC9‐4F).
The
cascade‐like
level
alignment
D18,
and
BTP‐eC9‐4F
facilitates
efficient
charge
transfer.
LJ1's
good
solubility
processing
solvent
high
miscibility
with
delay
precipitation
BTP‐eC9‐4F,
leading
to
improved
phase
morphology
blend
films.
Additionally,
LJ1
increases
spacing
between
polymer
donor
(PD)
molecule
acceptor
(SMA),
optimizing
film
reducing
OSCs.
Ternary
OSCs
based
on
D18:LJ1:BTP‐eC9‐4F
power
conversion
efficiency
(PCE)
19.43%
reduced
∆
.
Notably,
ternary
device
using
D18:LJ1:L8‐BO
attains
an
outstanding
PCE
19.78%,
which
one
highest
OSC.
work
highlights
effectiveness
strategy
OSC
while
minimizing