Small Structures,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 17, 2024
Metal
halide
perovskites
have
emerged
as
excellent
direct
X‐ray
detection
materials
owing
to
their
large
mobility‐lifetime
product,
strong
radiation
absorption,
and
low‐cost
preparation.
However,
it
is
still
a
challenge
achieve
stable
due
the
limitations
associated
with
severe
ion
migration
under
high
voltage
bias.
Herein,
based
on
bromine
substitution
strategy
suppress
migration,
2D
alternating
cations
intercalation‐type
(ACI)
perovskite,
(
R
‐MPA)(BrEA)PbBr
4
1
,
‐MPA
=
methylphenethylamm‐onium;
BrEA
2‐bromoethylamine)
reported
detection.
Specifically,
introducing
Br
atom
forms
additional
intermolecular
interactions
(i.e.,
Br···π)
enhances
hydrogen
bonding
interactions,
greatly
improving
structure
stability.
Based
this
enhanced
interaction,
presents
higher
activation
energy
of
(1.05
eV)
than
that
‐MPA)EAPbBr
resulting
in
lower
dark
current
drift
9.17
×
10
−8
nA
cm
−1
s
V
revealing
suppression
migration.
Consequently,
‐based
detector
shows
sensitivity
2653.7
μC
Gy
−2
and,
most
importantly,
outstanding
operational
environmental
stability,
maintaining
≈91%
its
initial
at
50
bias
after
90
days
air.
This
work
demonstrates
an
efficient
for
halogen
via
ACI
Advanced Materials,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 9, 2025
Developing
strategies
to
manage
ion-migration-induced
phase
segregation
in
wide-bandgap
(WBG)
perovskites
is
crucial
for
achieving
high-performance
perovskite-silicon
tandem
solar
cells
(TSCs).
However,
maintaining
continuous
suppression
of
from
the
film
crystallization
process
device
operation
remains
a
significant
challenge.
The
present
study
demonstrates
an
efficient
strategy
activating
halogen
circulation
WBG
perovskite
by
using
agents
(HCA)
N-halosuccinimide
molecules
as
sustainable
stabilizers,
order
achieve
dynamic
equilibrium
within
precursor
solution
and
film,
which
blocks
migration
path
Br-/I-
ions
both
aging
perovskites.
Attempts
on
situ
monitoring
halide
visually
verified
enhanced
stability
activated
films
devices.
Consequently,
work
achieves
champion
efficiency
up
23.25%
with
low
Voc
loss
0.39
V
1.67-eV-bandgap
device,
HCA-based
devices
can
maintain
88%
93%
their
initial
efficiencies
over
1000
h
under
illumination
2500
at
85
°C
N2
atmosphere,
respectively.
As
proof
concept,
perovskite/silicon
monolithic
TSCs
are
fabricated
demonstrate
high
1.99
power
conversion
33.2%.
Nano Letters,
Год журнала:
2024,
Номер
24(12), С. 3719 - 3726
Опубликована: Март 14, 2024
Mixed-halide
CsPb(Br/I)3
perovskite
quantum
dots
(QDs)
are
regarded
as
one
of
the
most
promising
candidates
for
pure-red
light-emitting
diodes
(PeLEDs)
due
to
their
precise
spectral
tuning
property.
However,
lead-rich
surface
these
QDs
usually
results
in
halide
ion
migration
and
nonradiative
recombination
loss,
which
remains
a
great
challenge
high-performance
PeLEDs.
To
solve
above
issues,
we
employ
chelating
agent
1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic
acid
hydrate
(DOTA)
polish
meanwhile
introduce
new
ligand
2,3-dimercaptosuccinic
(DMSA)
passivate
defects
QDs.
This
synchronous
post-treatment
strategy
high-quality
with
suppressed
an
improved
photoluminescence
yield,
enables
us
fabricate
spectrally
stable
PeLEDs
peak
external
efficiency
23.2%,
representing
best
performance
based
on
mixed-halide
reported
date.
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(27)
Опубликована: Март 3, 2024
Abstract
Structuring
metal
halide
perovskites
with
mixed
anions
is
a
promising
strategy
for
attaining
the
desired
bandgap
and
emission
color
technological
applications
such
as
electroluminescent
(EL)
light‐emitting
diodes
(LEDs)
ultrahigh‐definition
displays.
However,
these
suffer
from
severe
EL
spectral
stability
issues.
During
device
operation,
homogeneously
perovskite
phases
are
prone
to
form
halide‐segregated
domain
spatially
inhomogeneous
color,
which
hinders
practical
use
of
LEDs
(PeLEDs).
In
this
review,
comprehensive
survey
performed
about
underlying
driving
forces
phase
segregation,
representative
strategies
discussed
development
color/spectral
stable
PeLEDs.
Finally,
future
directions
prospects
outlined
regarding
further
enhancement
Advanced Materials,
Год журнала:
2024,
Номер
36(33)
Опубликована: Июнь 12, 2024
Self-assembled
monolayers
(SAMs)
as
the
hole-selective
contact
have
achieved
remarkable
success
in
iodine-based
perovskite
solar
cells
(PSCs),
while
their
impact
on
bromine-based
PSCs
is
limited
due
to
poor
crystallization
behavior
and
mismatched
energy
level
alignment.
Here,
a
highly
efficient
SAM
of
(2-(3,6-diiodo-9H-carbazol-9-yl)ethyl)phosphonic
acid
(I-2PACz)
employed
address
these
challenges
FAPbBr
Dalton Transactions,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 1, 2025
Metal
halide
perovskite
single
crystals
(MHPSCs)
are
highly
promising
materials
for
optoelectronic
applications,
but
their
stability
is
hindered
by
ion
migration,
thereby
impacting
performance.
ACS Applied Materials & Interfaces,
Год журнала:
2024,
Номер
16(7), С. 9012 - 9019
Опубликована: Фев. 8, 2024
Perovskite
LEDs
(PeLEDs)
have
emerged
as
a
next-generation
light-emitting
technology.
Recent
breakthroughs
were
made
in
achieving
highly
stable
near-infrared
and
green
PeLEDs.
However,
the
operational
lifetimes
(T50)
of
visible
PeLEDs
under
high
current
densities
(>10
mA
cm–2)
remain
unsatisfactory
(normally
<100
h),
limiting
possibilities
solid-state
lighting
AR/VR
applications.
This
problem
becomes
more
pronounced
for
mixed-halide
(e.g.,
red
blue)
perovskite
emitters
which
critical
challenges
such
halide
segregation
spectral
instability
are
present.
Here,
we
demonstrate
bright
based
on
perovskites,
showing
measured
T50
up
to
∼357
h
at
currents
≥25
cm–2,
record
stability
densities.
The
devices
produce
intense
emission
with
maximum
luminance
28,870
cd
m–2
(radiance:
1584
W
sr–1
m–2),
is
record-high
Key
this
demonstration
introduction
sulfonamide,
dipolar
molecular
stabilizer
that
effectively
interacts
ionic
species
emitters.
It
suppresses
migration
into
charge-transport
layers,
resulting
enhanced
brightness
These
results
represent
substantial
step
toward
emerging
