Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 27, 2024
Abstract
The
lithium
bis(trifluoromethane)
sulfonimide
salt
(Li‐TFSI)
and
4‐tert‐butylpyridine
(
t
‐BP)
codoped
2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene
(Spiro‐OMeTAD)
is
a
very
classic
dominant
hole
transport
layer
(HTL)
for
the
fabrication
of
high‐efficiency
perovskite
solar
cells
(PSCs).
However,
PSCs
based
Spiro‐OMeTAD
often
shows
poor
stability
due
to
hygroscopic
Li‐TFSI
that
prone
ion
migration,
volatile
‐BP,
time‐consuming
oxidation
in
air.
Herein,
hydrophobic
1,2‐Bis(perfluoropyridin‐4‐yl)disulfane
(BPFPDS)
designed
optimize
Spiro‐OMeTAD.
S‐Li,
F‐Li,
N‐Li
synergistic
interaction
between
BPFPDS
inhibited
Li
+
property
balanced
humidity
sensitivity
Li‐TFSI,
which
prevented
both
ions
water
molecules
from
corroding
layer.
In
addition,
F‐N
superamolecular
‐BP
restricted
volatility
indirectly
migration
ions.
As
result,
BPFPDS‐treated
CsPbI
3
PSC
engendered
respectable
efficiency
21.95%
an
impressive
open‐circuit
voltage
V
OC
)
1.29
V.
devices
sustained
96%
98%
their
efficiencies
after
aging
air
3000
h
tracking
at
maximum
power
point
1200
h,
respectively.
Abstract
Void‐free
perovskite
films
with
oriented
large
grains
are
considered
good
performance.
However,
contradictory
requirements
on
solvent
volatilization
arise
that
the
growth
of
requires
slow
while
residual
problem,
which
leads
to
difficult‐handled
voids
at
buried
interface,
quick
and
complete
volatilization.
Currently,
although
grain
boundary
additives
help
reach
grains,
occupation
in
channel
may
further
deteriorate
problem.
Herein,
porous
structures
“switchable
pore”
nature
constructed
based
flexible
hydrogen‐bonded
(HOF‐FJU‐2)
boundaries
meet
both
achieving
crystallization
control
restrain.
The
additive
molecules
prolongs
through
Pb‐O
bond
guides
(100)
facet
its
strong
ordered
accumulation
trend.
pre‐embedded
structure
opens
up
for
annealing
stage
then
switches
a
closed
pore
state
via
phase
transformation
after
completely
leaves,
preventing
intrusion
external
environment.
Combined
theoretical
calculations
situ
spectrum
tests,
thermodynamics
dynamics
analyzed.
As
expected,
target
device
exhibits
enhanced
performance
(improved
from
22.14%
24.18%)
stability.
Advanced Energy Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 27, 2024
Abstract
The
lithium
bis(trifluoromethane)
sulfonimide
salt
(Li‐TFSI)
and
4‐tert‐butylpyridine
(
t
‐BP)
codoped
2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene
(Spiro‐OMeTAD)
is
a
very
classic
dominant
hole
transport
layer
(HTL)
for
the
fabrication
of
high‐efficiency
perovskite
solar
cells
(PSCs).
However,
PSCs
based
Spiro‐OMeTAD
often
shows
poor
stability
due
to
hygroscopic
Li‐TFSI
that
prone
ion
migration,
volatile
‐BP,
time‐consuming
oxidation
in
air.
Herein,
hydrophobic
1,2‐Bis(perfluoropyridin‐4‐yl)disulfane
(BPFPDS)
designed
optimize
Spiro‐OMeTAD.
S‐Li,
F‐Li,
N‐Li
synergistic
interaction
between
BPFPDS
inhibited
Li
+
property
balanced
humidity
sensitivity
Li‐TFSI,
which
prevented
both
ions
water
molecules
from
corroding
layer.
In
addition,
F‐N
superamolecular
‐BP
restricted
volatility
indirectly
migration
ions.
As
result,
BPFPDS‐treated
CsPbI
3
PSC
engendered
respectable
efficiency
21.95%
an
impressive
open‐circuit
voltage
V
OC
)
1.29
V.
devices
sustained
96%
98%
their
efficiencies
after
aging
air
3000
h
tracking
at
maximum
power
point
1200
h,
respectively.
