Recent
advancements
in
blade‐coating
organic
photovoltaic
(OPV)
devices
utilizing
eco‐friendly
nonhalogenated
solvents
have
demonstrated
high
power
conversion
efficiencies
(PCEs)
when
processed
at
substrate
temperatures.
However,
this
method
poses
challenges
device
reproducibility
and
stability.
Herein,
a
BTP‐eC9‐
γ
nonfullerene
acceptor
(analogous
to
BTP‐eC9)
with
‐position‐branched
inner
side
chains
within
the
BTP‐eC9‐based
structural
motif
is
developed.
This
pin‐sized
extension
branching
position
enhances
solubility
of
toluene
solvent.
improvement
not
only
mitigates
excessive
aggregation
film
state
but
also
facilitates
fabrication
lower
Optimized
temperature
40
°C,
‐based
achieve
remarkable
PCEs
16.43%
(0.04
cm
2
)
14.95%
(1.0
).
Furthermore,
these
retain
their
uniformity
which
contributes
superior
reproducibility.
attributed
minimized
alteration
evolution
kinetics
fluid
flow.
These
findings
signify
promising
direction
for
industrial
production
OPV
devices.
Advanced Materials,
Год журнала:
2023,
Номер
36(5)
Опубликована: Ноя. 8, 2023
Abstract
Controlling
vertical
phase
separation
of
the
active
layer
to
enable
efficient
exciton
dissociation
and
charge
carrier
transport
is
crucial
boost
power
conversion
efficiencies
(PCEs)
pseudoplanar
heterojunction
(PPHJ)
organic
solar
cells
(OSCs).
However,
how
optimize
PPHJ
OSCs
via
molecule
design
rarely
reported
yet.
Herein,
ternary
polymerization
strategy
employed
develop
a
series
polymer
donors,
DL1‐DL4,
regulate
their
solubility,
molecular
aggregation,
orientation,
miscibility,
thus
efficiently
manipulating
in
OSCs.
Among
them,
DL1
not
only
has
enhanced
inhibited
aggregation
partial
edge‐on
orientation
facilitate
acceptor
molecules,
Y6,
permeate
into
increase
donor/acceptor
interfaces,
but
also
sustains
high
crystallinity
appropriate
miscibility
with
Y6
acquire
ordered
packing,
achieving
optimized
well
juggle
devices.
Therefore,
DL1/Y6
based
gain
best
probability,
highest
mobilities
weakest
recombination,
afford
an
impressive
PCE
19.10%,
which
record
value
for
terpolymer
donors.
It
demonstrates
that
method
PCEs.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(22)
Опубликована: Март 8, 2024
Abstract
Herein,
two
emerging
device
optimization
methods,
solid
additive
and
layer‐by‐layer
(LBL)
process,
for
organic
solar
cells
(OSCs)
are
simultaneously
studied.
Through
traditional
blend
cast
recently
proposed
identical
solvent
LBL
cast,
BDCB
(2‐monobromo‐1,3‐dichloro‐bezene),
a
benzene
derivative,
is
used
to
improve
the
performance
based
on
celebrity
combination
PM6:L8‐BO.
The
results
reveal
that
finely
optimized
concentration
in
PM6
solution
can
push
efficiency
of
19.03%
compared
with
only
18.12%
while
power
conversion
(PCE)
changing
trend
determined
by
BDCB's
ratio
L8‐BO's
precursor.
morphology
characterizations
confirm
there
exists
no
significant
stratification
LBL‐processed
devices,
supported
previously
reported
swelling‐intercalation‐phase
separation
(SIPS)
model.
Thereby,
additive's
2D
considered
smart
strategy
tuning
SIPS
which
various
final
states.
This
work
not
reports
cutting‐edge
binary
OSCs,
but
also
new
insight
deep
understanding
method‐based
development.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(6), С. 2182 - 2192
Опубликована: Янв. 1, 2024
In
this
work,
we
present
a
conceptual
strategy
based
on
multi-acceptor
components
to
realize
balanced
crystallization
kinetics
in
organic
solar
cells
(OSC)
that
deliver
19.35%
power
conversion
efficiency
with
superior
photostability.
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.
Solvent
additives
with
a
high
boiling
point
(BP)
and
low
vapor
pressure
(VP)
have
formed
key
handle
for
improving
the
performance
of
organic
solar
cells
(OSCs).
However,
it
is
not
always
clear
whether
they
remain
in
active-layer
film
after
deposition,
which
can
negatively
affect
reproducibility
stability
OSCs.
In
this
study,
an
easily
removable
solvent
additive
(4-chloro-2-fluoroiodobenzene
(CFIB))
BP
VP
introduced,
behaving
like
volatile
solid
that
be
completely
removed
during
device
fabrication
process.
In-depth
studies
CFIB
addition
into
D18-Cl
donor
N3
acceptor
validate
its
dominant
non-covalent
intermolecular
interactions
through
effective
electrostatic
interactions.
Such
phenomena
improve
charge
dynamics
kinetics
by
optimizing
morphology,
leading
to
enhanced
D18-Cl:N3-based
devices
power
conversion
efficiency
18.54%.
The
CFIB-treated
exhibits
exceptional
thermal
(T80
lifetime
=
120
h)
at
85
°C
compared
CFIB-free
device,
because
morphological
robustness
evolving
no
residual
film.
features
combination
advantages
(easy
application)
(high
volatility)
additives,
demonstrating
great
potential
use
commercial
mass
production
Abstract
Organic
solar
cells
(OSCs)
are
considered
as
a
promising
new
generation
of
clean
energy.
Bulk
heterojunction
(BHJ)
structure
has
been
widely
employed
in
the
active
layer
efficient
OSCs.
However,
precise
regulation
morphology
BHJ
is
still
challenging
due
to
competitive
coupling
between
crystallization
and
phase
separation.
Recently,
novel
pseudo‐planar
(PPHJ)
structure,
prepared
through
solution
sequential
deposition,
attracted
much
attention.
It
an
easy‐to‐prepare
which
separation
structures,
interfaces,
molecular
packing
can
be
separately
controlled.
Employing
PPHJ
properties
OSCs,
such
power
conversion
efficiency,
stability,
transparency,
flexibility,
so
on,
usually
better
than
its
counterpart.
Hence,
comprehensive
understanding
film‐forming
process,
control,
device
performance
should
considered.
In
terms
representative
works
about
PPHJ,
this
review
first
introduces
fabrication
process
layers
based
on
structure.
Second,
applied
control
methods
summarized.
Then,
influences
other
property
reviewed,
largely
expand
application.
Finally,
brief
prospect
development
tendency
devices
discussed
with
consideration
their
challenges.
Advanced Materials,
Год журнала:
2024,
Номер
36(29)
Опубликована: Май 4, 2024
Film
formation
kinetics
significantly
impact
molecular
processability
and
power
conversion
efficiency
(PCE)
of
organic
solar
cells.
Here,
two
ternary
random
copolymerization
polymers
are
reported,
D18─N-p
D18─N-m,
to
modulate
the
aggregation
ability
D18
by
introducing
trifluoromethyl-substituted
pyridine
unit
at
para-
meta-positions,
respectively.
The
introduction
reduces
material
adjusts
interactions
with
acceptor
L8-BO,
thereby
leading
largely
changed
film
earlier
phase
separation
longer
times,
which
enlarge
fiber
sizes
in
blend
films
improve
carrier
generation
transport.
As
a
result,
moderate
delivers
high
PCE
18.82%
is
further
improved
19.45%
via
interface
engineering.
Despite
slightly
inferior
small
area
device
performances,
D18─N-m
shows
solubility,
inspires
adjust
ratio
meta-trifluoromethyl
carefully
obtain
polymer
donor
D18─N-m-10
good
solubility
nonhalogenated
solvent
o-xylene.
High
PCEs
13.07%
12.43%
1
cm
