Interface
engineering
strategies
passivate
defects
on
the
polycrystalline
perovskite
film
surface
and
improve
stability
of
corresponding
solar
cells
(PSCs).
However,
a
single
interface
step
can
result
in
restricted
benefits
various
occasions.
Therefore,
an
appropriate
additional
modification
be
necessary
to
synergistically
device
performance.
In
this
study,
two-step
strategy
is
developed.
Initially,
CsPbI3
modified
by
choline
iodide
(ChI)
construct
1D
ChPbI3/3D
heterojunction,
then
with
use
crown
ether
applied.
The
further
eliminate
unpassivated
after
heterojunction
construction.
Benefiting
from
inhibited
interfacial
recombination,
resultant
carbon-electrode-based
PSCs
(C-PSCs)
deliver
champion
efficiency
18.78%,
representing
one
highest
levels
field.
Besides,
against
moisture,
heat,
light
stress
due
enhanced
hydrophobicity
suppressed
ion
migration.
Communications Materials,
Journal Year:
2024,
Volume and Issue:
5(1)
Published: July 23, 2024
Abstract
In
the
last
decade,
laboratory-scale
single-junction
perovskite
solar
cells
have
achieved
a
remarkable
power
conversion
efficiency
exceeding
26.1%.
However,
transition
to
industrial-scale
production
has
unveiled
significant
gap.
The
central
challenge
lies
in
difficulty
of
achieving
uniform,
high-quality
films
on
large
scale.
To
tackle
this
issue,
various
innovative
strategies
for
manipulating
crystallization
emerged
recent
years.
Based
an
in-depth
fundamental
understanding
nucleation
and
growth
mechanisms
large-area
prepared
through
blade/slot-die
coating
methods,
review
offers
critical
examination
manipulation
modules.
Lastly,
we
explore
future
avenues
aimed
at
enhancing
stability
PSMs,
thereby
steering
field
toward
commercially
viable
applications.
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(33), P. 22533 - 22547
Published: Aug. 8, 2024
Organic–inorganic
hybrid
metal
halide
perovskite
solar
cells
have
been
considered
as
one
of
the
most
promising
next-generation
photovoltaic
technologies.
Nevertheless,
defects
and
Li+
ionic
migration
will
seriously
affect
power
conversion
efficiency
stability
formal
device.
Herein,
we
designed
two
crown
ether
derivatives
(PC12
PC15)
with
different
cavity
diameters,
which
selectively
bind
to
cations.
It
is
found
that
PC15
in
precursor
solution
can
actively
regulate
nucleation
crystallization
processes
passivate
uncoordinated
Pb2+
ions,
while
PC12
at
interface
between
layer
hole-transporting
effectively
inhibit
ions
reduce
nonradiative
recombination
losses.
Therefore,
act
"lubricant"
defect
passivators,
well
inhibitors
ion
migration,
when
they
are
synergistically
applied
surface
bulk
layer.
Consequently,
optimized
device
achieved
a
champion
24.8%
significantly
improved
humidity,
thermal,
light
stability.
The
presence
of
positively
charged
cationic
defects
and
residual
PbI2
on
the
perovskite
surface
has
hindered
improvement
device
performance
long-term
stability.
Herein,
4,10-diaza-15-crown
5-ether
(DA15C5),
a
diaza-crown
ether
featuring
multiple
N
atom
O
donors,
is
developed
to
modify
surface.
Owing
strong
chemical
interactions
between
DA15C5
both
Pb2+
A-site
cations,
films
are
effectively
passivated,
thereby
suppressing
nonradiative
recombination
promoting
charge
transport
at
cathode
interface.
Furthermore,
treatment
promotes
formation
two-dimensional
(2D)
phase
by
reacting
with
PbI2,
which
optimizes
energy-level
alignment
enhances
film
Consequently,
open-circuit
voltage
(VOC)
fill
factor
(FF)
solar
cells
(PSCs)
improved
significantly,
achieving
an
impressive
power
conversion
efficiency
(PCE)
24.75%.
Moreover,
environmental
thermal
stabilities
DA15C5-treated
PSCs
markedly
enhanced.
unencapsulated
retains
over
80%
initial
PCE
after
heating
1400
h
85
°C
in
N2
atmosphere
maintains
78%
550
air
40
±
10%
relative
humidity
(RH).
This
study
proposes
as
molecular
modulator
achieve
efficient
stable
PSCs.
