Abstract
Top
electrodes
of
organic
photovoltaics
(OPVs)
are
usually
thermally
evaporated
in
the
vacuum,
which
is
non‐continuous
and
time‐consuming
has
been
bottleneck
for
OPV
fabrication
process.
Printable
top
that
free
high
temperature,
solvents
will
make
OPVs
more
attractive.
Low‐melting‐point
alloys
(LMPAs)
promising
candidates
printable
thanks
to
merits
matching
work
functions,
electron
conductivity,
environment
stability,
no
need
post‐treatment.
Here,
LMPA
directly
deposited
on
by
simply
falling
a
single
droplet
onto
substrate.
The
spreads
form
thin
film
with
smooth
interface
intimately
contacting
electrode
area
can
be
tailored
adjusting
diameter
or
Weber
number,
ratio
inertia
surface
tension.
morphology
mainly
affected
contact
temperature.
degree
oxidation
charges
also
influence
morphology.
droplet‐impacted
exhibit
power
conversion
efficiencies
up
16.17%.
This
demonstrates
potential
single‐droplet
impact
deposition
as
simple
method
printing
scalable
manufacturing.
Energy & Environmental Science,
Год журнала:
2024,
Номер
17(14), С. 5173 - 5182
Опубликована: Янв. 1, 2024
By
introducing
highly
crystalline
material
D18A
into
donor
layer
acting
as
energy
and
nucleating
agent,
an
optimal
PCE
of
19.25%
was
achieved
for
PM1
:
D18A/L8-BO
based
OPVs.
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 26, 2025
Abstract
Layer‐by‐layer
(LbL)
organic
photovoltaics
(OPVs)
are
fabricated
with
polymer
PM1
as
donor
and
small
molecule
L8‐BO
acceptor
by
employing
sequential
spin‐coating
technology.
The
BTP‐eC9
PTAA
deliberately
selected
for
individually
incorporating
into
layer
layer,
resulting
in
the
power
conversion
efficiency
(PCE)
increased
from
18.22%
to
19.23%.
improvement
of
performance
is
attributed
synergistically
short
circuit
current
density
(
J
SC
)
27.78
mA
cm
−2
fill
factor
(FF)
78.23%.
introduction
can
promote
photogenerated
exciton
dissociation,
especially
excitons
near
anode.
Meanwhile,
molecular
crystallinity
also
enhanced
appropriate
layer.
incorporation
provide
hole
transport
channels
effectively
improve
holes
generated
self‐dissociation
L8‐BO,
FFs
77.40%
synergistic
effects
layers
result
a
19.23%
PCE
optimized
LbL‐OPVs.
This
work
demonstrates
that
there
great
room
hierarchically
optimize
achieving
highly
efficient
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 26, 2025
Abstract
Recently,
benzene‐based
solid
additives
(BSAs)
have
emerged
as
pivotal
components
in
modulating
the
morphology
of
blend
film
organic
solar
cells
(OSCs).
However,
since
almost
all
substituents
on
BSAs
are
weak
electron‐withdrawing
groups
and
contain
halogen
atoms,
study
with
non‐halogenated
strong
has
received
little
attention.
Herein,
an
additive
strategy
is
proposed,
involving
incorporation
benzene
ring.
An
effective
BSA,
4‐nitro‐benzonitrile
(NBN),
selected
to
boost
efficiency
devices.
The
results
demonstrate
that
NBN‐treated
device
exhibits
enhanced
light
absorption,
superior
charge
transport
performance,
mitigated
recombination,
more
optimal
compared
additive‐free
OSC.
Consequently,
D18:BTP‐eC9+NBN‐based
binary
D18:L8‐BO:BTP‐eC9+NBN‐based
ternary
OSC
processed
by
solvent
achieved
outstanding
efficiencies
20.22%
20.49%,
respectively.
Furthermore,
universality
NBN
also
confirmed
different
active
layer
systems.
In
conclusion,
this
work
demonstrates
introduction
electron‐absorbing
moieties
ring
a
promising
approach
design
BSAs,
which
can
tune
achieve
highly
efficient
devices,
certain
guiding
significance
for
development
BSAs.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 1, 2024
Abstract
Dimerized
acceptors
show
promise
in
combining
the
high
performance
of
small‐molecule
non‐fullerene
(NFAs)
with
excellent
stability
polymer
acceptors.
The
central
linking
units
that
connect
two
acceptor
molecules
together
have
a
profound
impact
on
dimeric
properties
and
structure‐performance
relationships
blended
thin
films.
It
is
seen
different
linkers
significantly
affect
electronic
morphology
film.
electron‐donating
linker
elevates
absorption
coefficient,
affords
lower
bandgap,
reduces
energy
loss,
thus
better
photovoltaic
device
performance.
Better
fibrillar
can
be
obtained.
best
material
DY‐EDOT‐based
shows
power
conversion
efficiency
(PCE)
18.21%,
an
open‐circuit
voltage
(
V
oc
)
0.924
V,
short‐circuit
current
density
J
sc
25.20
mA
cm
−2
,
fill
factor
(FF)
78.19%,
which
among
highest
value
for
dimerized
This
study
reveals
fundamental
importance
determining
provides
useful
strategies
developing
oligomeric
polymeric
acceptors,
critical
simultaneously
improving
organic
solar
cells
(OSCs).
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 6, 2024
Abstract
Although
the
layer‐by‐layer
(LBL)
processing
can
usually
achieve
an
optimal
bulk‐heterojunction
morphology
for
high‐performance
Organic
photovoltaics
(OPVs),
unambiguous
working
principles
governing
evolution
are
still
lacking.
To
address
this
issue,
here
phase‐separation
kinetics
of
LBL
comprehensively
studied
using
in
situ
spectroscopies,
which
very
sensitive
to
intermolecular
interactions,
e.g.
molecular
packing
and
D:A
phase‐separation.
Upon
casting
nonfullerene
acceptor
(i.e.,
BTP‐eC9)
solution
on
top
polymer
donor,
i.e.,
PM6,
it
is
found
that
1)
solvent
will
first
swell
induce
a
gel,
2)
following
gelation,
NFAs
immediately
permeate
into
cavities
gel
form
molecular‐level
mixing,
3)
with
evaporation
solvent,
between
donor
occurs
results
as
those
achieved
blend‐cast
processing.
With
these
understandings,
more
diverse
conditions
have
been
purposely
utilized
dictate
phase
process
precisely.
As
result,
high
efficiency
19.7%
reached,
representing
one
best
among
binary
OPVs.
Therefore,
work
deciphers
should
pave
way
toward
advanced
control
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 18, 2024
Abstract
A
key
factor
in
optimizing
organic
solar
cells
(OSCs)
is
the
precise
control
of
blend
film
morphology
to
enhance
exciton
dissociation
and
charge
transport.
Solid
additives
play
a
vital
role
this
process,
with
3D
polyhedral
or
spherical
molecules
being
ideal
candidates
due
their
delocalized
π‐orbitals
omnidirectional
However,
application
classical
fullerene
derivatives
as
limited
by
synthetic
complicacy
poor
solubility.
Herein,
potential
globally
aromatic
carboranyl
cages
solid
additives,
specifically
1‐amino‐
o
‐carborane
(CB‐NH
2
)
1‐carboxy‐
(CB‐COOH),
explored
fine‐tune
improve
performance
OSCs.
These
provide
an
extensive
surface
for
hydrogen
bonding
interactions,
which
serve
driving
force
manipulating
vertical
phase
separation
active
layer
crystallinity.
Remarkably,
CB‐NH
‐processed
devices
well‐tuned
yield
remarkable
power
conversion
efficiency
19.48%,
highlighting
effectiveness
on
improving
OSC
performance.
This
work
challenges
reliance
offers
new
insights
into
mechanisms
can
achieve
high
OSCs,
emphasizing
significance
molecular
engineering
development
next‐generation
cell
technology.
