Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 27, 2024
Abstract
Halide
anion
migration
in
organic–inorganic
metal
halide
perovskites
significantly
influences
the
power
conversion
efficiency
(PCE)
and
hysteresis
of
perovskite
solar
cells
(PSCs).
These
materials
are
sensitive
to
various
external
stimuli
such
as
light,
heat,
electrical
bias,
highlighting
need
for
novel
post‐manufacturing
treatment
methods
alongside
a
deeper
understanding
their
mechanisms.
Here,
dark
electro
(DE)
is
introduced
that
applies
negative‐positive‐negative
bias
PSC
under
conditions,
which
particularly
effective
formamidinium
(FA)
lead
iodide
(FAPbI
3
)
PSCs
processed
with
methylammonium
chloride
(MACl)
additive.
The
DE
treatment,
followed
by
light
soaking,
results
an
average
PCE
increase
2.9
±
1.8%
(from
initial
18.2
2.0%
21.1
0.8%
after
treatment)
notable
decrease
deviation.
It
discovered
residual
anions
from
MACl
play
critical
role
treatment.
shaking
electric
investigated
using
energy‐dispersive
X‐ray
spectroscopy
(EDX)
time‐of‐flight
secondary
ion
mass
(TOF‐SIMS).
This
study
elucidates
distribution
impact
anions,
providing
insights
into
mechanisms
underlying
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 29, 2025
Abstract
Amid
the
rapid
advancement
of
formamidine
(FA)‐based
perovskite
solar
cells
(PSCs),
methylammonium
chloride
(MACl)
has
emerged
as
a
pivotal
molecule,
widely
recognized
in
achieving
high‐efficiency
PSCs.
However,
precursor
solution
(PPS),
particularly
after
prolonged
storage,
deprotonated
MA⁺
(MA
0
)
undergoes
cationic
addition
with
FA⁺,
leading
to
relative
depletion
FA⁺
and
reduction
crystalline
phase
purity.
Herein,
using
Piperazine‐2‐carboxylic
acid
dihydrochloride
(PCADCl)
inhibit
deprotonation
by
forming
strong
two‐point
hydrogen
bonds
between
piperazine's
amine
groups
proton
(H⁺)
MA⁺is
proposed,
thereby
extending
shelf
life
PPS.
Furthermore,
COOH
PCADCl
furtherly
suppress
while
promoting
coordination
unbound
Pb
2+
,
reducing
film
defects
improving
purity
phase.
Additionally,
energy
level
arrangement
PSCs
is
improved.
Benefiting
from
this
strategy,
PSC
fabricated
modified
PPS
achieves
an
impressive
efficiency
25.56%
retains
96%
its
initial
performance
aging
for
20
days.
Moreover,
unencapsulated
device
97%
over
1300
h.
This
work
significantly
advances
process
development
scientific
research,
representing
crucial
step
toward
large‐scale
production
commercialization
Advanced Functional Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 16, 2025
Abstract
Methylamine
chloride
(MACl)‐assisted
crystallization
can
increase
the
grain
size
of
formamidinium‐cesium
(FACs)
perovskite
film
at
buried
interface,
but
it
will
aggravate
separation
FA
and
Cs
phases.
Guided
by
density
functional
theory
calculations,
π
‐conjugated
hippuric
acid
(HPA)
molecules
are
introduced
into
system,
anchoring
precursor
increasing
formation
barrier
α
‐phase
perovskite.
Thus,
components
achieve
synchronous
phase
transition,
resulting
exhibits
homogeneous
distribution
constant
energy
level
arrangement.
Under
synergistic
effect
MACl‐assisted
HPA‐induced
a
large‐size,
low‐defect,
pure
is
obtained.
As
result,
HPA‐treated
solar
cell
achieves
an
improved
power
conversion
efficiency
(PCE)
26.05%,
which
one
highest
PCEs
among
FACs
systems.
The
released
lattice
strain
increases
ion
migration
barrier,
device
enhances
long‐term
stability.
unencapsulated
maintains
more
than
90%
its
initial
PCE
after
1000
h
under
continuous
1‐sun
illumination
conditions.
Small Structures,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 16, 2025
Tin
(Sn
2+
)‐based
halide
perovskites
have
emerged
as
promising
lead‐free
alternatives
for
high‐performance
thin‐film
transistors
(TFTs)
due
to
their
low
toxicity
and
excellent
hole
transport
properties.
However,
difficult
control
over
rapid
film
crystallization
hinders
the
device
performance
yield.
Herein,
incorporation
of
chloride
additives,
particularly
methylammonium
(MACl),
into
phenethylammonium
tin
iodide
(PEA
2
SnI
4
),
effectively
modulates
process
by
forming
intermediate
complexes
within
precursor
solution
film,
fabricating
large
crystallites
with
minimized
defects.
The
enhanced
quality
contributes
efficient
charge
in
channel
layers
TFT,
where
optimized
MACl‐PEA
TFTs
exhibit
up
a
threefold
increase
field‐effect
mobility
substantial
enhancement
on/off
current
ratio.
additive
engineering
can
address
fundamental
issues
Sn
‐based
perovskites,
providing
deeper
insights
modulation
efficiency
electronic
applications.
Abstract
Perovskite
solar
cells
(PSCs)
have
seen
rapid
advancements
over
the
past
decade,
driven
by
their
exceptional
optoelectronic
properties
and
high
power
conversion
efficiencies.
Cl‐based
additives
strategy
has
significantly
contributed
to
these
enhancing
crystallinity,
improving
preferred
orientation,
optimizing
surface
morphology
of
perovskite
films.
This
review
provides
a
comprehensive
summary
recent
insights
into
critical
role
in
photovoltaics,
focusing
on
mechanisms
behind
Cl
incorporation
its
effects
film
device
performance.
First,
impact
precursor
solution
coordination
colloidal
characteristics
is
discussed.
Then,
how
influence
phase
transitions
perovskites,
including
methylammonium
lead
iodide
(MAPbI
3
),
formamidinium
(FAPbI
2D
perovskites
examined.
Furthermore,
interfacial
treatments
quality
explored.
Based
insights,
overall
also
reviewed
Finally,
brief
overview
remaining
challenges
future
perspectives
are
provided
guide
ongoing
research
efforts
toward
additive
engineering
for
high‐performance
PSCs.
Advanced Optical Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 27, 2024
Abstract
Halide
anion
migration
in
organic–inorganic
metal
halide
perovskites
significantly
influences
the
power
conversion
efficiency
(PCE)
and
hysteresis
of
perovskite
solar
cells
(PSCs).
These
materials
are
sensitive
to
various
external
stimuli
such
as
light,
heat,
electrical
bias,
highlighting
need
for
novel
post‐manufacturing
treatment
methods
alongside
a
deeper
understanding
their
mechanisms.
Here,
dark
electro
(DE)
is
introduced
that
applies
negative‐positive‐negative
bias
PSC
under
conditions,
which
particularly
effective
formamidinium
(FA)
lead
iodide
(FAPbI
3
)
PSCs
processed
with
methylammonium
chloride
(MACl)
additive.
The
DE
treatment,
followed
by
light
soaking,
results
an
average
PCE
increase
2.9
±
1.8%
(from
initial
18.2
2.0%
21.1
0.8%
after
treatment)
notable
decrease
deviation.
It
discovered
residual
anions
from
MACl
play
critical
role
treatment.
shaking
electric
investigated
using
energy‐dispersive
X‐ray
spectroscopy
(EDX)
time‐of‐flight
secondary
ion
mass
(TOF‐SIMS).
This
study
elucidates
distribution
impact
anions,
providing
insights
into
mechanisms
underlying
