Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 14, 2024
Abstract
Molecular
stacking
behavior
exerts
a
significant
influence
on
the
blend
film
morphology
of
organic
solar
cells
(OSCs),
further
affecting
device
performance
and
stability.
Modulation
molecular
structure,
such
as
central
unit
end‐group,
can
profoundly
impact
this
process.
Herein,
four
quinoxaline
(Qx)‐fused‐core‐based
non‐fullerene
acceptors
(NFAs),
Qx‐N4F
Qx‐
o/m/p
‐N4F
are
synthesized
combining
π‐extended
end‐groups
optimized
units.
The
isomeric
fluorinated
units
lead
to
changes
in
local
dipole
moments
electrostatic
potential
distribution,
which
influences
pattern
photoelectronic
properties
NFAs.
Consequently,
binary
ternary
devices
based
PM6:Qx‐
p
achieve
superior
power
conversion
efficiencies
(PCE)
up
18.75%
19.48%,
respectively.
Grazing‐incidence
wide‐angle
X‐ray
scattering
(GIWAXS)
characterization
reveals
‐N4F's
stronger
crystallinity,
aggregation,
donor–acceptor
interactions,
separately
enhance
short‐circuit
current
density
(
J
SC
)
fill
factor
(FF)
through
higher
phase
purity
tighter
maintaining
more
interfaces.
Furthermore,
‐N4F‐based
demonstrate
exceptional
thermal
stability,
retaining
93.2%
initial
PCE
value
after
3000
h
heating
due
best
morphological
stability
with
most
stable
structure.
These
results
underscore
significance
synergistic
optimization
NFAs
conjugation
expansion
halogenation
substitution
for
obtaining
efficient
OSCs.
Nano-Micro Letters,
Год журнала:
2023,
Номер
16(1)
Опубликована: Ноя. 23, 2023
Abstract
With
plenty
of
popular
and
effective
ternary
organic
solar
cells
(OSCs)
construction
strategies
proposed
applied,
its
power
conversion
efficiencies
(PCEs)
have
come
to
a
new
level
over
19%
in
single-junction
devices.
However,
previous
studies
are
heavily
based
chloroform
(CF)
leaving
behind
substantial
knowledge
deficiencies
understanding
the
influence
solvent
choice
when
introducing
third
component.
Herein,
we
present
case
where
newly
designed
asymmetric
small
molecular
acceptor
using
fluoro-methoxylated
end-group
modification
strategy,
named
BTP-BO-3FO
with
enlarged
bandgap,
brings
different
morphological
evolution
performance
improvement
effect
on
host
system
PM6:BTP-eC9,
processed
by
CF
ortho-xylene
(
o
-XY).
detailed
analyses
supported
series
experiments,
best
PCE
19.24%
for
green
solvent-processed
OSCs
is
found
be
fruit
finely
tuned
crystalline
ordering
general
aggregation
motif,
which
furthermore
nourishes
favorable
charge
generation
recombination
behavior.
Likewise,
can
achieved
replacing
spin-coating
blade
coating
active
layer
deposition.
This
work
focuses
commonly
met
yet
frequently
ignored
issues
building
blends
demonstrate
cutting-edge
device
performance,
hence,
will
instructive
other
OSC
works
future.
Advanced Materials,
Год журнала:
2023,
Номер
36(4)
Опубликована: Ноя. 23, 2023
Abstract
Giant
dimeric
acceptor
(G‐Dimer)
is
becoming
one
of
the
most
promising
organic
solar
cell
(OSC)
materials
because
its
definite
structure,
long‐term
stability,
and
high
efficiency.
Strengthening
hetero‐molecular
interactions
by
monomer
modification
greatly
influences
morphology
thus
device
performance,
but
lacks
investigation.
Herein,
two
novel
quinoxaline
core‐based
G‐Dimers,
Dimer‐QX
Dimer‐2CF,
are
synthesized.
By
comparing
trifluoromethyl‐substituted
Dimer‐2CF
non‐substituted
Dimer‐QX,
trifluoromethylation
effect
on
G‐Dimer
investigated
revealed.
The
trifluoromethyl
with
strong
electronegativity
increases
electrostatic
potential
reduces
surface
energy
G‐Dimer,
weakening
homo‐molecular
ordered
packing
reinforcing
interaction
donor.
suppresses
fast
assembly
during
film
formation,
facilitating
small
domains
molecular
in
blend,
which
a
trade‐off
conventional
control.
Together
favorable
vertical
phase
separation,
efficient
charge
generation,
reduced
bimolecular
recombination
concurrently
obtained.
Hence,
Dimer‐2CF‐based
OSCs
obtain
cutting‐edge
efficiency
19.02%
fill
factor
surpassing
80%,
an
averaged
extrapolated
T
80
≈12
000
h
under
continuous
°C
heating.
This
study
emphasizes
importance
strategy,
providing
facile
strategy
for
designing
highly
stable
OSC
materials.
Advanced Materials,
Год журнала:
2024,
Номер
36(33)
Опубликована: Июнь 19, 2024
In
the
recent
advances
of
organic
solar
cells
(OSCs),
quinoxaline
(Qx)-based
nonfullerene
acceptors
(QxNFAs)
have
attracted
lots
attention
and
enabled
recorded
power
conversion
efficiency
approaching
20%.
As
an
excellent
electron-withdrawing
unit,
Qx
possesses
advantages
many
modifiable
sites,
wide
absorption
range,
low
reorganization
energy,
so
on.
To
develop
promising
QxNFAs
to
further
enhance
photovoltaic
performance
OSCs,
it
is
necessary
systematically
summarize
reported
far.
this
review,
all
focused
are
classified
into
five
categories
as
following:
SM-Qx,
YQx,
fused-YQx,
giant-YQx,
polymer-Qx
according
molecular
skeletons.
The
design
concepts,
relationships
between
structure
optoelectronic
properties,
intrinsic
mechanisms
device
discussed
in
detail.
At
end,
kind
materials
summed
up,
direction
prospected,
challenges
faced
by
given,
constructive
solutions
existing
problems
advised.
Overall,
review
presents
unique
viewpoints
conquer
challenge
thus
boost
OSCs
development
toward
commercial
applications.
Advanced Energy Materials,
Год журнала:
2024,
Номер
14(30)
Опубликована: Май 11, 2024
Abstract
Cyanation
is
a
common
chemical
modification
strategy
to
fine‐tune
the
energy
levels
and
molecular
packing
of
organic
semiconductors,
especially
materials
used
in
solar
cells
(OSCs).
Generally,
cyanation
modify
end
groups
high‐performance
small‐molecule
acceptors
(SMAs).
However,
has
not
been
investigated
on
central
backbone
SMAs,
which
could
introduce
stronger
intermolecular
interaction
enhance
π–π
stacking
for
rapid
charge
transport.
This
paper,
first
time,
reports
new
benzo‐quinoxaline
core
synthesizes
two
novel
A‐DA'D‐A
type
named
BQx‐CN
BQx‐2CN,
with
mono‐
di‐cyanide
groups,
respectively.
Through
tailoring
number
CN
BQx‐CN‐based
OSC
exhibits
best
device
performance
18.8%,
significantly
higher
than
non‐cyano
BQx‐based
one.
The
reason
superior
devices
can
be
attributed
fine‐tuned
level,
packing,
ideal
phase
segregation,
lead
exciton
dissociation,
faster
transport,
suppressed
recombination,
therefore
highest
fill
factor
(FF)
power
conversion
efficiencies
(PCE).
research
demonstrates
effectiveness
SMAs
enhanced
better
OSCs.
ACS Sustainable Chemistry & Engineering,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 9, 2025
The
rapid
development
of
organic
solar
cells
(OSCs)
has
been
particularly
remarkable
following
the
introduction
high-performance
small
molecule
electron
acceptor
Y6
and
its
derivatives.
Despite
advances
in
state-of-the-art
OSCs,
challenges
remain,
notably
relatively
low
open
circuit
voltage
(VOC)
charge
mobility
imbalance,
which
continue
to
hinder
further
improvements
OSCs'
performance.
To
address
these
issues,
this
work,
we
synthesized
a
main-chain
twisted
wide
bandgap
i-IEDTB,
not
only
possesses
superior
hole
over
but
also
higher
lowest
unoccupied
molecular
orbital
(LUMO)
energy
levels,
adopted
it
as
bifunctional
third
compound
couple
with
terpolymer
Z10
based
OSC
system.
integration
i-IEDTB
Z10:Y6
blend,
either
an
or
donor,
significantly
reduces
excessive
aggregation
facilitates
harmonized
distribution
mobilities
by
modulating
crystallization
properties
materials.
This
strategic
intervention
leads
marked
improvement
VOC
fill
factor
(FF).
Consequently,
power
conversion
efficiency
(PCE)
optimized
Z10:(Y6:i-IEDTB)
ternary
device
is
elevated
impressive
17.70%,
surpassing
16.50%
binary
OSC.
Besides,
after
doping
5%
weight
replaced
that
Z10,
device's
VOC,
FF
were
increased
0.846
V
78.08%
respectively,
resulting
enhanced
PCE
17.47%.
Further
investigation
demonstrates
universality
PM6:BTP-eC9-based
PM6:L8-BO-based
achieving
champion
efficiencies
18.14
18.08%,
respectively.
work
highlights
key
role
complementary
component
crystallographic
order
carrier
balance
within
Y-type
acceptor-based
OSCs.
Angewandte Chemie International Edition,
Год журнала:
2023,
Номер
63(6)
Опубликована: Дек. 15, 2023
Abstract
Utilizing
intermolecular
hydrogen‐bonding
interactions
stands
for
an
effective
approach
in
advancing
the
efficiency
and
stability
of
small‐molecule
acceptors
(SMAs)
polymer
solar
cells.
Herein,
we
synthesized
three
SMAs
(Qo1,
Qo2,
Qo3)
using
indeno[1,2‐
b
]quinoxalin‐11‐one
(Qox)
as
electron‐deficient
group,
with
incorporation
a
methylation
strategy.
Through
crystallographic
analysis,
it
is
observed
that
two
Qox‐based
methylated
(Qo2
exhibit
multiple
hydrogen
bond‐assisted
3D
network
transport
structures,
contrast
to
2D
structure
gem‐dichlorinated
counterpart
(Qo4).
Notably,
Qo2
exhibits
stronger
compared
Qo3.
Consequently,
PM6
:
device
realizes
highest
power
conversion
(PCE)
18.4
%,
surpassing
efficiencies
devices
based
on
Qo1
(15.8
%),
Qo3
(16.7
Qo4
(2.4
%).
This
remarkable
PCE
can
be
primarily
ascribed
enhanced
donor‐acceptor
miscibility,
more
favorable
medium
structure,
efficient
charge
transfer
collection
behavior.
Moreover,
demonstrates
exceptional
thermal
stability,
retaining
82.8
%
its
initial
after
undergoing
annealing
at
65
°C
250
hours.
Our
research
showcases
precise
methylation,
particularly
targeting
formation
tune
crystal
packing
patterns,
represents
promising
strategy
molecular
design
stable
SMAs.
Advanced Materials,
Год журнала:
2023,
Номер
36(11)
Опубликована: Дек. 15, 2023
Abstract
The
success
of
Y6‐type
nonfullerene
small
molecule
acceptors
(NF‐SMAs)
in
polymer
solar
cells
(PSCs)
can
be
attributed
to
their
unique
honeycomb
stacking
style,
which
leads
favorable
thin‐film
morphologies.
intermolecular
interactions
related
the
crystallization
tendency
these
NF‐SMAs
is
closely
governed
by
electron
accepting
end
groups.
For
example,
high
performance
Y6
derivative
L8‐BO
(BTP‐4F)
presents
three
types
modes
contrast
two
Y6.
Hence,
it
ultimately
interesting
obtain
more
insight
on
packing
properties
and
preferences
influenced
chemical
modifications
such
as
group
engineering.
This
work
designs
synthesizes
asymmetric
symmetric
derivatives
with
brominated
groups
explores
various
modes.
BTP‐3FBr
displays
an
optimized
thin
film
morphology,
leading
a
decent
power
conversion
efficiency
(PCE)
18.34%
binary
devices
top
PCE
19.32%
ternary
containing
15
wt%
IDIC
second
acceptor.
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.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(18), С. 6844 - 6855
Опубликована: Янв. 1, 2024
We
systematically
investigated
the
effects
of
top
substituents
on
physicochemical
properties
SMAs
and
achieved
highest
PCE
for
OSCs
processed
using
a
non-halogenated
solvent
without
any
extra
treatment.