Abstract
The
unfavorable
morphology
and
high
crystallization
temperature
(
T
c
)
of
inorganic
perovskites
pose
a
significant
challenge
to
their
widespread
application
in
photovoltaics.
In
this
study,
an
effective
approach
is
proposed
enhance
the
cesium
lead
triiodide
(CsPbI
3
while
lowering
its
.
By
introducing
dimethylammonium
acetate
into
perovskite
precursor
solution,
rapid
nucleation
stage
facilitated,
significantly
enhances
crystal
growth
intermediate
phase
at
low
annealing
temperatures,
followed
by
slow
higher
temperatures.
This
results
uniform
dense
CsPbI
films
with
enhanced
crystallinity,
simultaneously
reducing
from
200
150
°C.
Applying
positive‐intrinsic‐negative
(p‐i‐n)
inverted
cells
yields
power
conversion
efficiency
19.23%.
Importantly,
these
exhibit
stability,
even
under
stress
85
Abstract
All‐inorganic
CsPbI
3
perovskites
film
prepared
via
the
low‐temperature
solution
method
often
suffers
from
numerous
defects
during
crystallization
process.
Passivators
used
for
surface
passivation
typically
contain
monofunctional
groups,
including
sulfur,
nitrogen,
and
oxygen.
These
monodentate
groups
bind
to
uncoordinated
Pb
2+
by
sharing
electron
pairs,
thereby
reducing
defects.
However,
anchoring
formed
is
relatively
weak
susceptible
be
damage
due
its
low
bond
strength.
Herein,
a
bidentate
Lewis
base,
2‐(2‐pyridyl)ethylamine
(2‐PyEA),
containing
pyridine
ring
an
alkyl
amine,
employed
passivate
stabilize
crystal
structure.
Compared
ligands,
2‐PyEA
displays
significantly
enhanced
coordination
ability.
In
particular,
of
introduces
lattice
distortion
transforms
tensile
stress
into
compressive
within
film,
improving
structural
stability
perovskite
material.
As
result,
solar
cells
treated
with
achieve
impressive
power
conversion
efficiencies
(PCEs)
21.35%
17.19%
active
areas
0.09
1.0
cm
2
,
respectively.
Notably,
device
achieves
even
higher
PCE
39.95%
under
indoor
illumination
conditions.
The
devices
exhibit
ambient
conditions
5%
relative
humidity.
CsPbBr
3
improves
the
morphological
and
photophysical
properties
of
FAPbI
perovskite
films,
allowing
for
fabrication
uniform
modules
in
ambient
air,
adapted
to
standardized
indoor
light.
Halide
segregation
is
limited
reversible.
Abstract
The
unfavorable
morphology
and
high
crystallization
temperature
(
T
c
)
of
inorganic
perovskites
pose
a
significant
challenge
to
their
widespread
application
in
photovoltaics.
In
this
study,
an
effective
approach
is
proposed
enhance
the
cesium
lead
triiodide
(CsPbI
3
while
lowering
its
.
By
introducing
dimethylammonium
acetate
into
perovskite
precursor
solution,
rapid
nucleation
stage
facilitated,
significantly
enhances
crystal
growth
intermediate
phase
at
low
annealing
temperatures,
followed
by
slow
higher
temperatures.
This
results
uniform
dense
CsPbI
films
with
enhanced
crystallinity,
simultaneously
reducing
from
200
150
°C.
Applying
positive‐intrinsic‐negative
(p‐i‐n)
inverted
cells
yields
power
conversion
efficiency
19.23%.
Importantly,
these
exhibit
stability,
even
under
stress
85
