Advanced Materials,
Год журнала:
2024,
Номер
36(28)
Опубликована: Апрель 26, 2024
In
organic
photovoltaic
cells,
the
solution-aggregation
effect
(SAE)
is
long
considered
a
critical
factor
in
achieving
high
power-conversion
efficiencies
for
polymer
donor
(PD)/non-fullerene
acceptor
(NFA)
blend
systems.
However,
underlying
mechanism
has
yet
to
be
fully
understood.
Herein,
based
on
an
extensive
study
of
blends
consisting
representative
2D-benzodithiophene-based
PDs
and
acceptor-donor-acceptor-type
NFAs,
it
demonstrated
that
SAE
shows
strong
correlation
with
aggregation
kinetics
during
solidification,
competition
between
PD
NFA
determines
phase
separation
film
thus
performance.
SAEs
enable
earlier
evolutions
than
resulting
well-known
polymer-templated
fibrillar
network
structures
superior
PCEs.
With
weakening
PDs'
effects,
showing
stronger
tendencies
aggregate,
tend
form
oversized
domains,
leading
significantly
reduced
external
quantum
fill
factors.
These
trends
reveal
importance
matching
NFA.
The
abilities
various
materials
are
further
evaluated
ability/photovoltaic
parameter
diagrams
64
PD/NFA
combinations
provided.
This
work
proposes
guiding
criteria
facile
approach
match
efficient
Interdisciplinary materials,
Год журнала:
2023,
Номер
2(6), С. 866 - 875
Опубликована: Ноя. 1, 2023
Abstract
Realizing
bicontinuous
fibrillar
charge
transport
networks
in
the
photoactive
layer
has
been
considered
a
promising
method
to
achieve
high‐efficiency
organic
solar
cells
(OSCs);
however,
this
rarely
achieved
due
interference
of
molecular
organization
donor
and
acceptor
components
during
solution
casting.
In
contribution,
fibrillization
polymer
PM6
small
nonfullerene
L8‐BO
is
realized
with
assistance
conjugated
D18‐Cl.
Atomic
force
microscopy
photo‐induced
reveal
that
D18‐Cl
co‐assemble
into
long
slender
fibrils
within
wide
blending
ratios
their
high
compatibility;
contrast,
can
be
encouraged
incorporation
1%
By
utilizing
pseudo‐bulk
heterojunction
(p‐BHJ)
active
fabricated
by
layer‐by‐layer
deposition,
optimized
PM6+20%
D18‐Cl/L8‐BO+1%
OSCs
obtain
fibril
networks,
leading
enhanced
exciton
dissociation
processes
superior
power
conversion
efficiency
19.2%
(certified
18.91%)
compared
18.8%
PM6:D18‐Cl:L8‐BO
ternary
BHJ
OSCs.
Abstract
The
development
of
environmentally
friendly
and
sustainable
processes
for
the
production
high‐performance
organic
solar
cells
(OSCs)
has
become
a
critical
research
area.
Currently,
Y‐series
electron
acceptors
are
widely
used
in
OSCs,
achieving
power
conversion
efficiencies
above
19%.
However,
these
have
large
fused
conjugated
backbones
that
well‐soluble
halogenated
solvents,
such
as
chloroform
chlorobenzene,
but
poor
solubility
non‐halogenated
green
solvents.
To
overcome
this
challenge,
recent
studies
focused
on
developing
green‐processed
OSCs
use
non‐chlorinated
non‐aromatic
solvents
to
dissolve
bulk‐heterojunction
photoactive
layers
based
acceptors,
enabling
fabrication.
In
comprehensive
review,
an
overview
progress
is
provided,
covering
determination
Hansen
parameters,
dispersion
nanoparticles
water/alcohol.
It
hoped
timely
review
will
inspire
researchers
develop
new
ideas
approaches
important
field,
ultimately
leading
practical
application
OSCs.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(14), С. 4944 - 4967
Опубликована: Янв. 1, 2024
Quinoxaline-based
nonfullerene
acceptors
show
highly
tunable
photoelectric
properties
and
superior
performance
for
sunlight
utilization
enabled
by
their
powerful
core-functionalization
ability.
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
Advanced Materials,
Год журнала:
2024,
Номер
36(28)
Опубликована: Апрель 26, 2024
In
organic
photovoltaic
cells,
the
solution-aggregation
effect
(SAE)
is
long
considered
a
critical
factor
in
achieving
high
power-conversion
efficiencies
for
polymer
donor
(PD)/non-fullerene
acceptor
(NFA)
blend
systems.
However,
underlying
mechanism
has
yet
to
be
fully
understood.
Herein,
based
on
an
extensive
study
of
blends
consisting
representative
2D-benzodithiophene-based
PDs
and
acceptor-donor-acceptor-type
NFAs,
it
demonstrated
that
SAE
shows
strong
correlation
with
aggregation
kinetics
during
solidification,
competition
between
PD
NFA
determines
phase
separation
film
thus
performance.
SAEs
enable
earlier
evolutions
than
resulting
well-known
polymer-templated
fibrillar
network
structures
superior
PCEs.
With
weakening
PDs'
effects,
showing
stronger
tendencies
aggregate,
tend
form
oversized
domains,
leading
significantly
reduced
external
quantum
fill
factors.
These
trends
reveal
importance
matching
NFA.
The
abilities
various
materials
are
further
evaluated
ability/photovoltaic
parameter
diagrams
64
PD/NFA
combinations
provided.
This
work
proposes
guiding
criteria
facile
approach
match
efficient
