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.
The Journal of Physical Chemistry C,
Journal Year:
2024,
Volume and Issue:
128(28), P. 11784 - 11792
Published: July 4, 2024
Although
there
have
been
extensive
studies
on
the
degradation
of
organic–inorganic
hybrid
perovskite
(OIHP)
films
at
microscale,
microscopic
mechanism
OIHP
under
effect
bias
voltage
and
electric
current
has
not
fully
understood.
We
report
in-situ
measurements
process
solution-processed
MA0.4FA0.6PbI3
using
scanning
tunneling
microscopy.
During
process,
hole-like
structures
appear
inside
grain
boundaries,
accompanied
by
shrinking
size.
With
a
sufficiently
large
bias,
direct
fragmentation
is
observed.
Furthermore,
film
degradations
passivation
with
dibenzo-24-crown-8
molecules
are
also
studied,
clear
retardation
Our
work
provides
observations
caused
local
voltage,
which
essential
for
understanding
metal
halide
films.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 4, 2024
Abstract
The
migration
and
diffusion
of
Li
+
,
I
−
Ag
impedes
the
realization
long‐term
operationally
stable
perovskite
solar
cells
(PSCs).
Herein,
we
report
a
multifunctional
universal
molecular
complexation
strategy
to
simultaneously
stabilize
hole
transport
layer
(HTL),
electrode
by
suppression
via
directly
incorporating
bis(2,4,6‐trichlorophenyl)
oxalate
(TCPO)
into
HTL.
Meanwhile,
TCPO
co‐doping
results
in
enhanced
mobility
HTL,
advantageous
energy
band
alignment
mitigated
interfacial
defects,
thereby
leading
facilitated
extraction
minimized
nonradiative
recombination
losses.
TCPO‐doped
regular
device
achieves
peak
power
conversion
efficiency
(PCE)
25.68
%
(certified
25.59
%).
unencapsulated
doped
devices
maintain
over
90
their
initial
efficiencies
after
730
h
continuous
operation
under
one
sun
illumination,
2800
storage
at
30
relative
humidity,
1200
exposure
65
°C,
which
represents
best
stabilities
reported
for
PSCs.
This
work
provides
new
approach
enhance
PCE
stability
PSCs
host–guest
rational
design
ligand
molecules.
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.
